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Results 1 - 79 of 79

The $R$-process Alliance: Enrichment of $R$-process Elements in a Simulated Milky Way-like Galaxy
- Virtual Journal - Volume 22, Issue 42 - article #6
- Yutaka Hirai, Timothy C. Beers, Young Sun Lee, Shinya Wanajo, Ian U. Roederer, Masaomi Tanaka, Masashi Chiba, Takayuki R. Saitoh, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
- https://arxiv.org/abs/2410.11943
The R-process Alliance: Fifth Data Release from the Search for R-process-enhanced Metal-poor Stars in the Galactic Halo with the GTC
- Virtual Journal - Volume 22, Issue 40 - article #21
- Avrajit Bandyopadhyay, Rana Ezzeddine, Carlos Allende Prieto, Nima Aria, Shivani P. Shah, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika M. Holmbeck, Vinicius M. Placco
- The Astrophysical Journal Supplement
- https://doi.org/10.3847/1538-4365/ad6f0f
Discovery of a Metal-Poor Red Giant Star with the Highest Ultra-Lithium Enhancement
- Virtual Journal - Volume 22, Issue 33 - article #5
- Jeremy Kowkabany, Rana Ezzeddine, Corinne Charbonnel, Ian U. Roederer, Ella Xi Wang, Yangyang Li, Zoe Hackshaw, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika Holmbeck, Vinicius M. Placco, Charli M. Sakari
- https://arxiv.org/abs/2209.02184
The R-Process Alliance: 2MASS J22132050–5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe] = +2.45
- Virtual Journal - Volume 22, Issue 33 - article #27
- Ian U. Roederer, Timothy C. Beers, Kohei Hattori, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/ad57bf
The $R$-Process Alliance: Fifth Data Release from the Search for $R$-Process-Enhanced Metal-poor Stars in the Galactic Halo with the GTC
- Virtual Journal - Volume 22, Issue 32 - article #7
- Avrajit Bandyopadhyay, Rana Ezzeddine, Carlos Allende Prieto, Nima Aria, Shivani P. Shah, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika M. Holmbeck, Vinicius M. Placco, Ian U. Roederer, Charli M. Sakari
- https://arxiv.org/abs/2408.03731
The R-Process Alliance: 2MASS J22132050-5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe] = +2.45
- Virtual Journal - Volume 22, Issue 23 - article #15
- Ian U. Roederer, Timothy C. Beers, Kohei Hattori, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
- https://arxiv.org/abs/2406.02691
Element abundance patterns in stars indicate fission of nuclei heavier than uranium. (arXiv:2312.06844v1 [astro-ph.SR])
- Virtual Journal - Volume 21, Issue 48 - article #9
- Ian U. Roederer, Nicole Vassh, Erika M. Holmbeck, Matthew R. Mumpower, Rebecca Surman, John J. Cowan, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese T. Hansen, Vinicius M. Placco, Charli M. Sakari
- http://arxiv.org/abs/2312.06844
SPLUS J142445.34–254247.1: An r-process–enhanced, Actinide-boost, Extremely Metal-poor Star Observed with GHOST
- Virtual Journal - Volume 21, Issue 47 - article #48
- Vinicius M. Placco, Felipe Almeida-Fernandes, Erika M. Holmbeck, Ian U. Roederer, Mohammad K. Mardini, Christian R. Hayes, Kim Venn, Kristin Chiboucas, Emily Deibert, Roberto Gamen
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/ad077e
Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disk. (arXiv:2310.03075v2 [astro-ph.GA] UPDATED)
- Virtual Journal - Volume 21, Issue 46 - article #3
- Anya Dovgal, Kim A. Venn, Federico Sestito, Christian R. Hayes, Alan W. McConnachie, Julio F. Navarro, Vinicius M. Placco, Else Starkenburg, Nicolas F. Martin, John S. Pazder, Kristin Chiboucas, Emily Deibert, Roberto Gamen, Jeong-Eun Heo, Venu M. Kalari, Eder Martioli, Siyi Xu, Ruben Diaz, Manuel Gomez-Jiminez, David Henderson, Pablo Prado, Carlos Quiroz, J. Gordon Robertson, Roque Ruiz-Carmona, Chris Simpson, Cristian Urrutia, Fletcher Waller, Trsytyn Berg, Gregory Burley, Zachary Hartman, Michael Ireland, Steve Margheim, Gabriel Perez, Joanna Thomas-Osip
- http://arxiv.org/abs/2310.03075
Search for Extremely Metal-poor Stars with Gemini-N/Graces. I. Chemical-abundance Analysis
- Virtual Journal - Volume 21, Issue 18 - article #12
- Miji Jeong, Young Sun Lee, Timothy C. Beers, Vinicius M. Placco, Young Kwang Kim, Jae-Rim Koo, Ho-Gyu Lee, Soung-Chul Yang
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/acc58a
The R-Process Alliance: Chemodynamically Tagged Groups. II. An Extended Sample of Halo r-process-enhanced Stars
- Virtual Journal - Volume 21, Issue 4 - article #21
- Derek Shank, Timothy C. Beers, Vinicius M. Placco, Dmitrii Gudin, Thomas Catapano, Erika M. Holmbeck, Rana Ezzeddine, Ian U. Roederer, Charli M. Sakari, Anna Frebel
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/aca322
Search for Extremely Metal-Poor Stars with GEMINI-N/GRACES I. Chemical-Abundance Analysis. (arXiv:2301.06236v1 [astro-ph.GA])
- Virtual Journal - Volume 21, Issue 3 - article #8
- Miji Jeong, Young Sun Lee, Timothy C. Beers, Vinicius M. Placco, Young Kwang Kim, Jae-Rim Koo, Ho-Gyu Lee, Soung-Chul Yang
- http://arxiv.org/abs/2301.06236
The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks. (arXiv:2210.15105v1 [astro-ph.SR])
- Virtual Journal - Volume 20, Issue 42 - article #14
- Ian U. Roederer, John J. Cowan, Marco Pignatari, Timothy C. Beers, Elizabeth A. Den Hartog, Rana Ezzeddine, Anna Frebel, Terese T. Hansen, Erika M. Holmbeck, Matthew R. Mumpower, Vinicius M. Placco, Charli M. Sakari, Rebecca Surman, Nicole Vassh
- http://arxiv.org/abs/2210.15105
Discovery of an Ultra Lithium-rich Metal-Poor Red Giant star. (arXiv:2209.02184v1 [astro-ph.SR])
- Virtual Journal - Volume 20, Issue 35 - article #2
- Jeremy Kowkabany, Rana Ezzeddine, Corinne Charbonnel, Ian U. Roederer, Yangyang Li, Zoe Hackshaw, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika Holmbeck, Vinicius M. Placco, Charli M. Sakari
- http://arxiv.org/abs/2209.02184
The emph{R}-Process Alliance: Chemo-Dynamically Tagged Groups II. An Extended Sample of Halo $r$-Process-Enhanced Stars. (arXiv:2208.09712v1 [astro-ph.GA])
- Virtual Journal - Volume 20, Issue 33 - article #7
- Derek Shank, Timothy C. Beers, Vinicius M. Placco, Dmitrii Gudin, Thomas Catapano, Erika M. Holmbeck, Rana Ezzeddine, Ian U. Roederer, Charli M. Sakari, Anna Frebel, Terese T. Hansen
- http://arxiv.org/abs/2208.09712
Mining S-PLUS for Metal-poor Stars in the Milky Way
- Virtual Journal - Volume 20, Issue 33 - article #23
- Vinicius M. Placco, Felipe Almeida-Fernandes, Anke Arentsen, Young Sun Lee, William Schoenell, Tiago Ribeiro, Antonio Kanaan
- The Astrophysical Journal Supplement
- https://doi.org/10.3847/1538-4365/ac7ab0
The R-process Alliance: A Nearly Complete R-process Abundance Template Derived from Ultraviolet Spectroscopy of the R-process-enhanced Metal-poor Star HD 222925
- Virtual Journal - Volume 20, Issue 24 - article #27
- Ian U. Roederer, James E. Lawler, Elizabeth A. Den Hartog, Vinicius M. Placco, Rebecca Surman, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese T. Hansen, Kohei Hattori
- The Astrophysical Journal Supplement
- https://doi.org/10.3847/1538-4365/ac5cbc
On the inconsistency of [C/Fe] abundances and the fractions of carbon-enhanced metal-poor stars among various stellar surveys. (arXiv:2206.04081v1 [astro-ph.GA])
- Virtual Journal - Volume 20, Issue 23 - article #5
- Anke Arentsen, Vinicius M. Placco, Young Sun Lee, David S. Aguado, Nicolas F. Martin, Else Starkenburg, Jinmi Yoon
- http://arxiv.org/abs/2206.04081
Silicon and Strontium abundances of very metal-poor stars determined from near-infrared spectra. (arXiv:2112.07433v1 [astro-ph.SR])
- Virtual Journal - Volume 19, Issue 51 - article #9
- Wako Aoki, Timothy C. Beers, Satoshi Honda, Hiroyuki T. Ishikawa, Tadafumi Matsuno, Vinicius M. Placco, Jinmi Yoon, Hiroki Harakawa, Teruyuki Hirano, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Takayuki Kotani, Tomoyuki Kudo, Takashi Kurokawa, Masayuki Kuzuhara, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Motohide Tamura, Akitoshi Ueda, Sebastien Vievard
- http://arxiv.org/abs/2112.07433
Dynamically Tagged Groups of Metal-Poor Stars from the Best & Brightest Survey. (arXiv:2109.08600v1 [astro-ph.GA])
- Virtual Journal - Volume 19, Issue 39 - article #4
- Derek Shank, Timothy C. Beers, Vinicius M. Placco, Guilherme Limberg, Emma Jaques, Zhen Yuan, Kevin C. Schlaufman, Andrew R. Casey, Yang Huang, Young Sun Lee, Kohei Hattori, Rafael M. Santucci
- http://arxiv.org/abs/2109.08600
Cosmological Insights into the Early Accretion of r -process-enhanced Stars. I. A Comprehensive Chemodynamical Analysis of LAMOST J1109+0754
- Virtual Journal - Volume 18, Issue 45 - article #27
- Mohammad K. Mardini, Vinicius M. Placco, Yohai Meiron, Marina Ishchenko, Branislav Avramov, Matteo Mazzarini, Peter Berczik, Manuel Arca Sedda, Timothy C. Beers, Anna Frebel, Ali Taani, Martina Donnari, Mashhoor A. Al-Wardat,, Gang Zhao
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/903/2/88
Cosmological Insights into the Early Accretion of textit{r}-Process-Enhanced stars. I. A Comprehensive Chemo-dynamical Analysis of LAMOST J1109+0754. (arXiv:2009.12142v1 [astro-ph.GA])
- Virtual Journal - Volume 18, Issue 40 - article #2
- Mohammad K. Mardini, Vinicius M. Placco, Yohai Meiron, Marina Ishchenko, Branislav Avramov, Matteo Mazzarini, Peter Berczik, Manuel Arca Sedda, Timothy C. Beers, Anna Frebel, Ali Taani, Mashhoor A. Al-Wardat, Gang Zhao
- http://arxiv.org/abs/2009.12142
The R -Process Alliance: A Very Metal-poor, Extremely r -process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of r- III Stars
- Virtual Journal - Volume 18, Issue 30 - article #19
- Madelyn Cain, Anna Frebel, Alexander P. Ji, Vinicius M. Placco, Rana Ezzeddine, Ian U. Roederer, Kohei Hattori, Timothy C. Beers, Jorge MelÃ©ndez, Terese T. Hansen,, Charli M. Sakari
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/898/1/40
The R -process Alliance: The Peculiar Chemical Abundance Pattern of RAVE J183013.5−455510
- Virtual Journal - Volume 18, Issue 28 - article #19
- Vinicius M. Placco, Rafael M. Santucci, Zhen Yuan, Mohammad K. Mardini, Erika M. Holmbeck, Xilu Wang, Rebecca Surman, Terese T. Hansen, Ian U. Roederer, Timothy C. Beers, Arthur Choplin, Alexander P. Ji, Rana Ezzeddine, Anna Frebel, Charli M. Sakari, Devin D. Whitten,, Joseph Zepeda
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/897/1/78
The $R$-Process Alliance: Fourth Data Release from the Search for $r$-Process-Enhanced Stars in the Galactic Halo. (arXiv:2007.00749v1 [astro-ph.SR])
- Virtual Journal - Volume 18, Issue 27 - article #4
- Erika M. Holmbeck, Terese T. Hansen, Timothy C. Beers, Vinicius M. Placco, Devin D. Whitten, Kaitlin C. Rasmussen, Ian U. Roederer, Rana Ezzeddine, Charli M. Sakari, Anna Frebel, Maria R. Drout, Joshua D. Simon, Ian B. Thompson, Joss Bland-Hawthorn, Brad K. Gibson, Eva K. Grebel, Georges Kordopatis, Andrea Kunder, Jorge Melendez, Julio F. Navarro, Warren A.Reid, George Seabroke, Matthias Steinmetz, Fred Watson, Rosemary F.G. Wyse
- http://arxiv.org/abs/2007.00749
The R-process Alliance: First Magellan/MIKE Release from the Southern Search for R-Process-enhanced Stars. (arXiv:2006.07731v1 [astro-ph.SR])
- Virtual Journal - Volume 18, Issue 25 - article #9
- Rana Ezzeddine, Kaitlin Rasmussen, Anna Frebel, Anirudh Chiti, Karina Hinojisa, Vinicius M. Placco, Ian U. Roederer, Alexander P. Ji, Timothy C. Beers, Terese T. Hansen, Charli M. Sakari, Jorge Melendez
- http://arxiv.org/abs/2006.07731
The R-Process Alliance: J1521-3538, a very metal-poor, extremely r-process-enhanced star with [Eu/Fe]=+2.2, and the class of r-III stars. (arXiv:2006.08080v1 [astro-ph.SR])
- Virtual Journal - Volume 18, Issue 25 - article #10
- Madelyn Cain (MIT, JINA), Anna Frebel (MIT, JINA), Alexander P. Ji (Carnegie), Vinicius M. Placco (Notre Dame, JINA), Rana Ezzeddine (MIT, JINA), Ian U. Roederer (U Michigan), Kohei Hattori (U Michigan, Carnegie Mellon), Timothy C. Beers (Notre Dame, JINA), Jorge Mélendez (Sao Paulo), Terese T. Hansen (Carnegie), Charli M. Sakari (San Francisco State U, JINA)
- http://arxiv.org/abs/2006.08080
The discovery of anomalously high levels of [Si/Fe] among metal-poor giants in the bulge, disk, and halo of the Milky Way. (arXiv:1904.05884v1 [astro-ph.GA])
- Virtual Journal - Volume 17, Issue 16 - article #9
- José, G. Fernández-Trincado, Timothy C. Beers, Vinicius M. Placco, Sarah L. Martell, Edmundo Moreno, Baitian Tang, Alan Alves-Brito, Sandro Villanova, Mario Ortigoza-Urdaneta, Dante Minniti, Angeles Pérez-Villegas, Céline Reylé, Annie C. Robin
- http://arxiv.org/abs/1904.05884
Evidence for an aspherical Population III supernova explosion inferred from the hyper metal-poor star HE1327-2326. (arXiv:1904.03211v1 [astro-ph.SR])
- Virtual Journal - Volume 17, Issue 15 - article #3
- Rana Ezzeddine, Anna Frebel, Ian U. Roederer, Nozomu Tominaga, Jason Tumlinson, Miho Ishigaki, Ken'ichi Nomoto, Vinicius M. Placco, Wako Aoki
- http://arxiv.org/abs/1904.03211
The R -Process Alliance: Discovery of a Low- α , r -process-enhanced Metal-poor Star in the Galactic Halo
- Virtual Journal - Volume 17, Issue 14 - article #22
- Charli M. Sakari, Ian U. Roederer, Vinicius M. Placco, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese Hansen, Christopher Sneden, John J. Cowan, George Wallerstein, Elizabeth M. Farrell, Kim A. Venn, Gal MatijeviÄ, Rosemary F. G. Wyse, Joss Bland-Hawthorn, Cristina Chiappini, Kenneth C. Freeman, Brad K. Gibson, Eva K. Grebel, Amina Helmi, Georges Kordopatis, Andrea Kunder, Julio Navarro, Warren Reid, George Seabroke, Matthias Steinmetz,, Fred Watson
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/874/2/148
The R-Process Alliance: Discovery of a low-alpha, r-Process-Enhanced Metal-Poor Star in the Galactic Halo. (arXiv:1903.01480v1 [astro-ph.SR])
- Virtual Journal - Volume 17, Issue 10 - article #9
- Charli M. Sakari, Ian U. Roederer, Vinicius M. Placco, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese Hansen, Christopher Sneden, John J. Cowan, George Wallerstein, Elizabeth M. Farrell, Kim A. Venn, Gal Matijevic, Rosemary F.G. Wyse, Joss Bland-Hawthorn, Cristina Chiappini, Kenneth C. Freeman, Brad K. Gibson, Eva K. Grebel, Amina Helmi, Georges Kordopatis, Andrea Kunder, Julio Navarro, Warren Reid, George Seabroke, Matthias Steinmetz, Fred Watson
- http://arxiv.org/abs/1903.01480
Discovery of a nitrogen-enhanced metal-poor binary system: Possible evidence for pollution from an extinct massive AGB Star. (arXiv:1902.10635v1 [astro-ph.GA])
- Virtual Journal - Volume 17, Issue 9 - article #3
- José, G. Fernández-Trincado, Ronald Mennickent, Mauricio Cabezas, Olga Zamora, Sarah L. Martell, Timothy C. Beers, Vinicius M. Placco, David M. Nataf, Szabolcs Mészáros, Dante Minniti, Dominik R. G. Schleicher, Baitian Tang, Angeles Pérez-Villegas, Annie C. Robin, Céline Reylé,
- http://arxiv.org/abs/1902.10635
Abundances and kinematics of carbon-enhanced metal-poor stars in the Galactic halo*; A new classification scheme based on Sr and Ba. (arXiv:1901.05968v1 [astro-ph.SR])
- Virtual Journal - Volume 17, Issue 4 - article #1
- Camilla J. Hansen, Terese T. Hansen, Andreas Koch, Tim C. Beers, Birgitta Nordström, Vinicius M. Placco, Johannes Andersen
- http://arxiv.org/abs/1901.05968
The R -Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme R -process Enhancement of [Eu/H] = −0.14
- Virtual Journal - Volume 16, Issue 40 - article #27
- Ian U. Roederer, Charli M. Sakari, Vinicius M. Placco, Timothy C. Beers, Rana Ezzeddine, Anna Frebel,, Terese T. Hansen
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/865/2/129
The R-Process Alliance: First Release from the Northern Search for r-Process Enhanced Metal-Poor Stars in the Galactic Halo. (arXiv:1809.09156v1 [astro-ph.SR])
- Virtual Journal - Volume 16, Issue 39 - article #19
- Charli M. Sakari, Vinicius M. Placco, Elizabeth M. Farrell, Ian U. Roederer, George Wallerstein, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese Hansen, Erika M. Holmbeck, Christopher Sneden, Kim A. Venn, Christopher Evan Davis, Gal Matijevic, Rosemary F.G. Wyse, Joss Bland-Hawthorn, Cristina Chiappini, Kenneth C. Freeman, Brad K. Gibson, Eva K. Grebel, Amina Helmi, Georges Kordopatis, Andrea Kunder, Julio Navarro, Warren Reid, George Seabroke, Matthias Steinmetz, Fred Watson
- http://arxiv.org/abs/1809.09156
The R-Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-Poor Star with an Extreme R-Process Enhancement of [Eu/H] = -0.14. (arXiv:1808.09469v1 [astro-ph.SR])
- Virtual Journal - Volume 16, Issue 35 - article #12
- Ian U. Roederer (U. Michigan, JINA-CEE), Charli M. Sakari (U. Washington), Vinicius M. Placco (U. Notre Dame, JINA-CEE), Timothy C. Beers (U. Notre Dame, JINA-CEE), Rana Ezzeddine (MIT, JINA-CEE), Anna Frebel (MIT, JINA-CEE), Terese T. Hansen (Carnegie Observatories)
- http://arxiv.org/abs/1808.09469
The R -Process Alliance: Chemical Abundances for a Trio of r -process-enhanced Stars—One Strong, One Moderate, and One Mild
- Virtual Journal - Volume 16, Issue 35 - article #21
- Madelyn Cain, Anna Frebel, Maude Gull, Alexander P. Ji, Vinicius M. Placco, Timothy C. Beers, Jorge MelÃ©ndez, Rana Ezzeddine, Andrew R. Casey, Terese T. Hansen, Ian U. Roederer,, Charli Sakari
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/864/1/43
The R -Process Alliance: Discovery of the First Metal-poor Star with a Combined r - and s -process Element Signature
- Virtual Journal - Volume 16, Issue 32 - article #37
- Maude Gull, Anna Frebel, Madelyn G. Cain, Vinicius M. Placco, Alexander P. Ji, Carlo Abate, Rana Ezzeddine, Amanda I. Karakas, Terese T. Hansen, Charli Sakari, Erika M. Holmbeck, Rafael M. Santucci, Andrew R. Casey,, Timothy C. Beers
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/862/2/174
The R-Process Alliance: Chemical Abundances for a Trio of R-Process-Enhanced Stars -- One Strong, One Moderate, One Mild. (arXiv:1807.03734v1 [astro-ph.SR])
- Virtual Journal - Volume 16, Issue 28 - article #24
- Madelyn Cain (MIT), Anna Frebel (MIT), Maude Gull (MIT), Alexander P. Ji (Carngie), Vinicius M. Placco (Notre Dame), Timothy C. Beers (Notre Dame), Jorge Melendez (Sao Paulo), Rana Ezzeddine (MIT, JINA), Andrew R. Casey (Monash), Terese T. Hansen (Carnegie), Ian U. Roederer (U Michigan), Charli Sakari (U Washington)
- http://arxiv.org/abs/1807.03734
The R -process Alliance: First Release from the Southern Search for R -process-enhanced Stars in the Galactic Halo
- Virtual Journal - Volume 16, Issue 19 - article #17
- Terese T. Hansen, Erika M. Holmbeck, Timothy C. Beers, Vinicius M. Placco, Ian U. Roederer, Anna Frebel, Charli M. Sakari, Joshua D. Simon,, Ian B. Thompson
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/858/2/92
The $R$-Process Alliance: First Release from the Southern Search for $r$-Process-Enhanced Stars in the Galactic Halo. (arXiv:1804.03114v1 [astro-ph.SR])
- Virtual Journal - Volume 16, Issue 15 - article #12
- Terese T. Hansen, Erika M. Holmbeck, Timothy C. Beers, Vinicius M. Placco, Ian U. Roederer, Anna Frebel, Charli M. Sakari, Joshua D. Simon, Ian B. Thompson
- http://arxiv.org/abs/1804.03114
The r -process Pattern of a Bright, Highly r -process-enhanced Metal-poor Halo Star at [Fe/H] ∼ −2
- Virtual Journal - Volume 16, Issue 7 - article #32
- Charli M. Sakari, Vinicius M. Placco, Terese Hansen, Erika M. Holmbeck, Timothy C. Beers, Anna Frebel, Ian U. Roederer, Kim A. Venn, George Wallerstein, Christopher Evan Davis, Elizabeth M. Farrell,, David Yong
- The Astrophysical Journal Letters
- http://iopscience.iop.org/2041-8205/854/2/L20
RAVE J203843.2–002333: The First Highly R-process-enhanced Star Identified in the RAVE Survey
- Virtual Journal - Volume 15, Issue 29 - article #15
- Vinicius M. Placco, Erika M. Holmbeck, Anna Frebel, Timothy C. Beers, Rebecca A. Surman, Alexander P. Ji, Rana Ezzeddine, Sean D. Points, Catherine C. Kaleida, Terese T. Hansen, Charli M. Sakari,, Andrew R. Casey
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/844/1/18
APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy. (arXiv:1707.03456v1 [astro-ph.GA])
- Virtual Journal - Volume 15, Issue 28 - article #2
- Sten Hasselquist, Matthew Shetrone, Verne Smith, Jon Holtzman, Andrew McWilliam, J. G. Fernández-Trincado, Timothy C. Beers, Steven R. Majewski, David L. Nidever, Baitian Tang, Patricia B. Tissera, Emma Fernández Alvar, Carlos Allende Prieto, Andres Almeida, Borja Anguiano, Giuseppina Battaglia, Leticia Carigi, Gloria Delgado Inglada, Peter Frinchaboy, D. A. García-Hernández, Doug Geisler, Dante Minniti, Vinicius M. Placco, Mathias Schultheis, Jennifer Sobeck, Sandro Villanova
- http://arxiv.org/abs/1707.03456
Carbon-enhanced metal-poor stars in the SDSS-APOGEE database. (arXiv:1707.02310v1 [astro-ph.GA])
- Virtual Journal - Volume 15, Issue 28 - article #5
- Collin L. Kielty, Kim A. Venn, Nicholas B. Loewen, Matthew D. Shetrone, Vinicius M. Placco, Farbod Jahandar, Szabolcs Mészáros, Sarah L. Martell
- http://arxiv.org/abs/1707.02310
Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical Analysis
- Virtual Journal - Volume 15, Issue 3 - article #32
- Timothy C. Beers, Vinicius M. Placco, Daniela Carollo, Silvia Rossi, Young Sun Lee, Anna Frebel, John E. Norris, Sarah Dietz,, Thomas Masseron
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/835/1/81
Identification of Neodymium in the Apogee H-Band Spectra
- Virtual Journal - Volume 14, Issue 50 - article #20
- Sten Hasselquist, Matthew Shetrone, Katia Cunha, Verne V. Smith, Jon Holtzman, J. E. Lawler, Carlos Allende Prieto, Timothy C. Beers, Drew Chojnowski, J. G. FernÃ¡ndez-Trincado, D. A. GarcÃa-HernÃ¡ndez, Fred R. Hearty, Steven R. Majewski, C. B. Pereira, Vinicius M. Placco, Sandro Villanova,, Olga Zamora
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/833/1/81
OBSERVATIONAL CONSTRAINTS ON FIRST-STAR NUCLEOSYNTHESIS. I. EVIDENCE FOR MULTIPLE PROGENITORS OF CEMP-NO STARS
- Virtual Journal - Volume 14, Issue 50 - article #21
- Jinmi Yoon, Timothy C. Beers, Vinicius M. Placco, Kaitlin C. Rasmussen, Daniela Carollo, Siyu He, Terese T. Hansen, Ian U. Roederer,, Jeff Zeanah
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/833/1/20
OBSERVATIONAL CONSTRAINTS ON FIRST-STAR NUCLEOSYNTHESIS. II. SPECTROSCOPY OF AN ULTRA METAL-POOR CEMP-NO STAR
- Virtual Journal - Volume 14, Issue 50 - article #22
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Jinmi Yoon, Anirudh Chiti, Alexander Heger, Conrad Chan, Andrew R. Casey,, Norbert Christlieb
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/833/1/21
Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical Analysis. (arXiv:1611.03762v1 [astro-ph.SR])
- Virtual Journal - Volume 14, Issue 47 - article #2
- Timothy C. Beers, Vinicius M. Placco, Daniela Carollo, Silvia Rossi, Anna Frebel, John E. Norris, Sarah Dietz, Thomas Masseron
- http://arxiv.org/abs/1611.03762
G64-12 and G64-37 Are Carbon-enhanced Metal-poor Stars
- Virtual Journal - Volume 14, Issue 39 - article #33
- Vinicius M. Placco, Timothy C. Beers, Henrique Reggiani,, Jorge MelÃ©ndez
- The Astrophysical Journal Letters
- http://iopscience.iop.org/2041-8205/829/2/L24
G64-12 and G64-37 are Carbon-Enhanced Metal-Poor Stars. (arXiv:1609.00679v1 [astro-ph.SR])
- Virtual Journal - Volume 14, Issue 37 - article #10
- Vinicius M. Placco, Timothy C. Beers, Henrique Reggiani, Jorge Melendez
- http://arxiv.org/abs/1609.00679
Observational Constraints on First-Star Nucleosynthesis. II. Spectroscopy of an Ultra Metal-Poor CEMP-no Star. (arXiv:1609.02134v1 [astro-ph.SR])
- Virtual Journal - Volume 14, Issue 37 - article #17
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Jinmi Yoon, Anirudh Chiti, Alexander Heger, Conrad Chan, Andrew R. Casey, Norbert Christlieb
- http://arxiv.org/abs/1609.02134
Observational Constraints on First-Star Nucleosynthesis. I. Evidence for Multiple Progenitors of CEMP-no Stars. (arXiv:1607.06336v1 [astro-ph.SR])
- Virtual Journal - Volume 14, Issue 30 - article #10
- Jinmi Yoon, Timothy C. Beers, Vinicius M. Placco, Kaitlin C. Rasmussen, Daniela Carollo, Siyu He, Terese T. Hansen, Ian U. Roederer
- http://arxiv.org/abs/1607.06336
Detection of Phosphorus, Sulphur, and Zinc in the Carbon-enhanced Metal-poor Star BD+44 493
- Virtual Journal - Volume 14, Issue 25 - article #26
- Ian U. Roederer, Vinicius M. Placco, and Timothy C. Beers
- The Astrophysical Journal Letters
- http://iopscience.iop.org/2041-8205/824/2/L19
2MASS J18082002-5104378: The brightest (V=11.9) ultra metal-poor star
- Virtual Journal - Volume 14, Issue 3 - article #1
- Jorge Melendez, Vinicius M. Placco, Marcelo Tucci-Maia, Ivan Ramirez, Ting S. Li, Gabriel Perez
- arXiv.org - Astrophysics - Volume: 2016, Issue: 15 Jan
- arXiv:1601.03462 [pdf, ps, other]
The Chemical Abundances of Stars in the Halo (CASH) Project. III. A New Classification Scheme for Carbon-enhanced Metal-poor Stars with s-process Element Enhancement
- Virtual Journal - Volume 13, Issue 45 - article #35
- Julie K. Hollek, Anna Frebel, Vinicius M. Placco, Amanda I. Karakas, Matthew Shetrone, Christopher Sneden, and Norbert Christlieb
- The Astrophysical Journal - Volume: 814, Issue: 2
- View article PDF (1.65 MB)
The Chemical Abundances of Stars in the Halo (CASH) Project. III. A New Classification Scheme for Carbon-Enhanced Metal-poor Stars with S-process Element Enhancement
- Virtual Journal - Volume 13, Issue 40 - article #17
- Julie K. Hollek (UT/JINA), Anna Frebel (MIT/JINA), Vinicius M. Placco (U Notre Dame/JINA), Amanda I. Karakas (ANU), Matthew Shetrone (UT/McDonald Obs.), Christopher Sneden (UT), Norbert Christlieb (Heidelberg)
- arXiv.org - Astrophysics - Volume: 2015, Issue: 30 Oct
- arXiv:1510.06825 [pdf, ps, other]
Hubble Space Telescope Near-Ultraviolet Spectroscopy of Bright CEMP-s Stars
- Virtual Journal - Volume 13, Issue 31 - article #8
- Vinicius M. Placco, Timothy C. Beers, Inese I. Ivans, Dan Filler, Julie A. Imig, Ian U. Roederer, Carlo Abate, Terese Hansen, John J. Cowan, Anna Frebel, James E. Lawler, Hendrik Schatz, Christopher Sneden, Jennifer S. Sobeck, Wako Aoki, Verne V. Smith, Michael Bolte
- arXiv.org - Astrophysics - Volume: 2015, Issue: 28 Aug
- arXiv:1508.05872 [pdf, ps, other]
SD 1313-0019 -- Another second-generation star with [Fe/H] = -5.0, observed with the Magellan Telescope
- Virtual Journal - Volume 13, Issue 25 - article #11
- Anna Frebel (MIT), Anirudh Chiti (MIT), Alexander P. Ji (MIT), Heather R. Jacobson (MIT), Vinicius M. Placco (Notre Dame U/JINA)
- arXiv.org - Astrophysics - Volume: 2015, Issue: 10 Jul
- arXiv:1507.01973 [pdf, ps, other]
Metal-Poor Stars Observed with the Magellan Telescope. III. New Extremely and Ultra Metal-Poor Stars from SDSS/SEGUE and Insights on the Formation of Ultra Metal-Poor Stars
- Virtual Journal - Volume 13, Issue 25 - article #19
- Vinicius M. Placco, Anna Frebel, Young Sun Lee, Heather R. Jacobson, Timothy C. Beers, Jose M. Pena, Conrad Chan, Alexander Heger
- arXiv.org - Astrophysics - Volume: 2015, Issue: 17 Jul
- arXiv:1507.03656 [pdf, ps, other]
Carbon-enhanced Metal-poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
- Virtual Journal - Volume 12, Issue 25 - article #90
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, and Richard J. Stancliffe
- The Astrophysical Journal - Volume: 797, Issue: 1
- View article PDF (1.10 MB)
Carbon-Enhanced Metal-Poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
- Virtual Journal - Volume 12, Issue 23 - article #1
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Richard J. Stancliffe
- arXiv.org - Astrophysics - Volume: 2014, Issue: 10 Oct
- arXiv:1410.2223 [pdf, ps, other]
Population Studies. XIII. A New Analysis of the Bidelman-MacConnell "Weak-metal" Stars—Confirmation of Metal-poor Stars in the Thick Disk of the Galaxy
- Virtual Journal - Volume 12, Issue 23 - article #134
- Timothy C. Beers, John E. Norris, Vinicius M. Placco, Young Sun Lee, Silvia Rossi, Daniela Carollo, and Thomas Masseron
- The Astrophysical Journal - Volume: 794, Issue: 1
- View article PDF (871 KB)
Population Studies. XIII. A New Analysis of the Bidelman-MacConnell "Weak-Metal" Stars - Confirmation of Metal-Poor Stars in the Thick Disk of the Galaxy
- Virtual Journal - Volume 12, Issue 21 - article #24
- Timothy C. Beers, John E. Norris, Vinicius M. Placco, Young Sun Lee, Silvia Rossi, Daniela Carollo, Thomas Masseron
- arXiv.org - Astrophysics - Volume: 2014, Issue: 15 Aug
- arXiv:1408.3165 [pdf, ps, other]
Carbon-enhanced Metal-poor Stars: CEMP-s and CEMP-no Subclasses in the Halo System of the Milky Way
- Virtual Journal - Volume 12, Issue 21 - article #138
- Daniela Carollo, Ken Freeman, Timothy C. Beers, Vinicius M. Placco, Jason Tumlinson, and Sarah L. Martell
- The Astrophysical Journal - Volume: 788, Issue: 2
- View article PDF (774 KB)
Hubble Space Telescope Near-ultraviolet Spectroscopy of the Bright CEMP-no Star BD+44°493
- Virtual Journal - Volume 12, Issue 21 - article #149
- Vinicius M. Placco, Timothy C. Beers, Ian U. Roederer, John J. Cowan, Anna Frebel, Dan Filler, Inese I. Ivans, James E. Lawler, Hendrik Schatz, Christopher Sneden, Jennifer S. Sobeck, Wako Aoki, and Verne V. Smith
- The Astrophysical Journal - Volume: 790, Issue: 1
- View article PDF (835 KB)
Seven New Carbon-enhanced Metal-poor RR Lyrae Stars
- Virtual Journal - Volume 12, Issue 20 - article #266
- Catherine R. Kennedy, Richard J. Stancliffe, Charles Kuehn, Timothy C. Beers, T. D. Kinman, Vinicius M. Placco, Henrique Reggiani, Silvia Rossi, and Young Sun Lee
- The Astrophysical Journal - Volume: 787, Issue: 1
- View article PDF (709 KB)
Seven New Carbon-Enhanced Metal-Poor RR Lyrae Stars
- Virtual Journal - Volume 12, Issue 14 - article #9
- Catherine R. Kennedy, Richard J. Stancliffe, Charles Kuehn, Timothy C. Beers, T. D. Kinman, Vinicius M. Placco, Henrique Reggiani, Silvia Rossi, Young Sun Lee
- arXiv.org - Astrophysics - Volume: 2014, Issue: 4 Apr
- arXiv:1404.0120 [pdf, ps, other]
Metal-poor Stars Observed with the Magellan Telescope. II. Discovery of Four Stars with [Fe/H] ≤ –3.5
- Virtual Journal - Volume 12, Issue 4 - article #43
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Norbert Christlieb, Young Sun Lee, Catherine R. Kennedy, Silvia Rossi, and Rafael M. Santucci
- The Astrophysical Journal - Volume: 781, Issue: 1
- View article PDF (1.00 MB)
Metal-Poor Stars Observed with the Magellan Telescope II. Discovery of Four Stars with [Fe/H] < -3.5
- Virtual Journal - Volume 11, Issue 48 - article #7
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Norbert Christlieb, Young Sun Lee, Catherine R. Kennedy, Silvia Rossi, Rafael M. Santucci
- arXiv.org - Astrophysics - Volume: 2013, Issue: 2 Dec
- arXiv:1311.5855 [pdf, ps, other]
Carbon-enhanced Metal-poor Stars in SDSS/SEGUE. I. Carbon Abundance Estimation and Frequency of CEMP Stars
- Virtual Journal - Volume 11, Issue 42 - article #2
- Young Sun Lee, Timothy C. Beers, Thomas Masseron, Bertrand Plez, Constance M. Rockosi, Jennifer Sobeck, Brian Yanny, Sara Lucatello, Thirupathi Sivarani, Vinicius M. Placco, Daniela Carollo
- arXiv.org - Astrophysics - Volume: 2013, Issue: 18 Oct
- arXiv:1310.3276 [pdf, ps, other]
Metal-poor Stars Observed with the Magellan Telescope. I. Constraints on Progenitor Mass and Metallicity of AGB Stars Undergoing s-process Nucleosynthesis
- Virtual Journal - Volume 11, Issue 23 - article #46
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Amanda I. Karakas, Catherine R. Kennedy, Silvia Rossi, Norbert Christlieb, and Richard J. Stancliffe
- The Astrophysical Journal - Volume: 770, Issue: 2
- Abstract References Full text PDF (2.07 MB) Enhanced article HTML
Metal-Poor Stars Observed with the Magellan Telescope I. Constraints on Progenitor Mass and Metallicity of AGB Stars Undergoing s-Process Nucleosynthesis
- Virtual Journal - Volume 11, Issue 18 - article #4
- Vinicius M. Placco, Anna Frebel, Timothy C. Beers, Amanda I. Karakas, Catherine R. Kennedy, Silvia Rossi, Norbert Christlieb, Richard J. Stancliffe
- arXiv.org - Astrophysics - Volume: 2013, Issue: 3 May
- arXiv:1304.7869 [pdf, ps, other]
Searches for Metal-Poor Stars from the Hamburg/ESO Survey using the CH G-band
- Virtual Journal - Volume 9, Issue 38 - article #18
- Vinicius M. Placco, Catherine R. Kennedy, Timothy C. Beers, Norbert Christlieb, Silvia Rossi, Thirupathi Sivarani, Young Sun Lee, Dieter Reimers, Lutz Wisotzki
- arXiv.org - Astrophysics - Volume: 2011, Issue: 23 Sep
- arXiv:1109.3993 [pdf, ps, other]
[O/Fe] Estimates for Carbon-enhanced Metal-poor Stars from Near-infrared Spectroscopy
- Virtual Journal - Volume 9, Issue 7 - article #28
- Catherine R. Kennedy, Thirupathi Sivarani, Timothy C. Beers, Young Sun Lee, Vinicius M. Placco, Silvia Rossi, Norbert Christlieb, Falk Herwig and Bertrand Plez
- Astronomical Journal - Volume: 141, Issue: 3
- doi: 10.1088/0004-6256/141/3/102 Tag this article
[O/Fe] Estimates for Carbon-Enhanced Metal-Poor Stars from Near-IR Spectroscopy
- Virtual Journal - Volume 9, Issue 2 - article #10
- Catherine R. Kennedy, Thirupathi Sivarani, Timothy C. Beers, Young Sun Lee, Vinicius M. Placco, Silvia Rossi, Norbert Christlieb, Falk Herwig, Bertrand Plez
- arXiv.org - Astrophysics - Volume: 2011, Issue: 14 Jan
- arXiv:1101.2260 [pdf, ps, other]
A Search for Unrecognized Carbon-Enhanced Metal-Poor Stars in the Galaxy
- Virtual Journal - Volume 8, Issue 7 - article #19
- <em >Vinicius M. Placco, Catherine R. Kennedy, Silvia Rossi, Timothy C. Beers, Young Sun Lee, Norbert Christlieb, Thirupathi Sivarani, Dieter Reimers, and Lutz Wisotzki</em&gt,
- Astronomical Journal - Volume: 139, Issue: 3
- Abstract | References
A Search for Unrecognized Carbon-Enhanced Metal-Poor Stars in the Galaxy
- Virtual Journal - Volume 8, Issue 3 - article #2
- Vinicius M. Placco, Catherine R. Kennedy, Silvia Rossi, Timothy C. Beers, Young Sun Lee, Norbert Christlieb, Thirupathi Sivarani, Dieter Reimers, Lutz Wisotzki
- arXiv.org - Astrophysics - Volume: 2010, Issue: 15 Jan
- arXiv:1001.2512 [ps, pdf, other]

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