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Results 1 - 40 of 40

Spectacular Nucleosynthesis from Early Massive Stars
- Virtual Journal - Volume 22, Issue 6 - article #42
- Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman, Keivan G. Stassun, Alexander Heger, Marco Pignatari, Adrian M. Price-Whelan, Maria Bergemann
- The Astrophysical Journal Letters
- https://doi.org/10.3847/2041-8213/ad19c4
Spectacular nucleosynthesis from early massive stars. (arXiv:2401.02484v1 [astro-ph.SR])
- Virtual Journal - Volume 22, Issue 2 - article #9
- Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman, Keivan G. Stassun, Alexander Heger, Marco Pignatari, Adrian M. Price-Whelan, Maria Bergemann, Guy S. Stringfellow, Carla Frohlich, Henrique Reggiani, Erika M. Holmbeck, Jamie Tayar, Shivani P. Shah, Emily J. Griffith, Chervin F. P. Laporte, Andrew R. Casey, Keith Hawkins, Danny Horta, William Cerny, Pierre Thibodeaux, Sam A. Usman, Joao A. S. Amarante, Rachael L. Beaton, Phillip A. Cargile, Cristina Chiappini, Charlie Conroy, Jennifer A. Johnson, Juna A. Kollmeier, Haining Li, Sarah Loebman, Georges Meynet, Dmitry Bizyaev, Joel R. Brownstein, Pramod Gupta, Sean Morrison, Kaike Pan, Solange V. Ramirez, Hans-Walter Rix, Jose Sanchez-Gallego
- http://arxiv.org/abs/2401.02484
Uranium Abundances and Ages of r-process Enhanced Stars with Novel U ii Lines
- Virtual Journal - Volume 21, Issue 20 - article #39
- Shivani P. Shah, Rana Ezzeddine, Alexander P. Ji, Terese T. Hansen, Ian U. Roederer, MÃ¡rcio Catelan, Zoe Hackshaw, Erika M. Holmbeck, Timothy C. Beers, Rebecca Surman
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/acb8af
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II. (arXiv:2207.03499v2 [astro-ph.GA] UPDATED)
- Virtual Journal - Volume 21, Issue 8 - article #4
- Alexander P. Ji, Joshua D. Simon, Ian U. Roederer, Ekaterina Magg, Anna Frebel, Christian I. Johnson, Ralf S. Klessen, Mattis Magg, Gabriele Cescutti, Mario Mateo, Maria Bergemann, John I. Bailey III
- http://arxiv.org/abs/2207.03499
Metal Mixing in the r-process Enhanced Ultrafaint Dwarf Galaxy Reticulum II
- Virtual Journal - Volume 21, Issue 7 - article #11
- Alexander P. Ji, Joshua D. Simon, Ian U. Roederer, Ekaterina Magg, Anna Frebel, Christian I. Johnson, Ralf S. Klessen, Mattis Magg, Gabriele Cescutti, Mario Mateo
- Astronomical Journal
- https://doi.org/10.3847/1538-3881/acad84
Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II
- Virtual Journal - Volume 21, Issue 7 - article #15
- Joshua D. Simon, Thomas M. Brown, BurÃ§in Mutlu-Pakdil, Alexander P. Ji, Alex Drlica-Wagner, Roberto J. Avila, Clara E. MartÃnez-VÃ¡zquez, Ting S. Li, Eduardo Balbinot, Keith Bechtol
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/aca9d1
Uranium Abundances and Ages of $R$-process Enhanced Stars with Novel U II Lines. (arXiv:2301.11945v1 [astro-ph.SR])
- Virtual Journal - Volume 21, Issue 5 - article #5
- Shivani P. Shah, Rana Ezzeddine, Alexander P. Ji, Terese Hansen, Ian U. Roederer, Márcio Catelan, Zoe Hackshaw, Erika M. Holmbeck, Timothy C. Beers, Rebecca Surman
- http://arxiv.org/abs/2301.11945
Timing the r-Process Enrichment of the Ultra-Faint Dwarf Galaxy Reticulum II. (arXiv:2212.00810v1 [astro-ph.GA])
- Virtual Journal - Volume 20, Issue 48 - article #6
- Joshua D. Simon, Thomas M. Brown, Burçin Mutlu-Pakdil, Alexander P. Ji, Alex Drlica-Wagner, Roberto J. Avila, Clara E. Martínez-Vázquez, Ting S. Li, Eduardo Balbinot, Keith Bechtol, Anna Frebel, Marla Geha, Terese T. Hansen, David J. James, Andrew B. Pace, M. Aguena, O. Alves, F. Andrade-Oliveira, J. Annis, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Costanzi, L. N. da Costa, J. De Vicente, S. Desai, P. Doel, S. Everett, I. Ferrero, J. Frieman, J. García-Bellido, M. Gatti, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, N. Kuropatkin, J. L. Marshall, J. Mena-Fernández, R. Miquel, A. Palmese, F. Paz-Chinchón, M. E. S. Pereira, A. Pieres, et al. (15 additional authors not shown)
- http://arxiv.org/abs/2212.00810
Detailed chemical abundances of stars in the outskirts of the Tucana II ultra-faint dwarf galaxy. (arXiv:2205.01740v1 [astro-ph.GA])
- Virtual Journal - Volume 20, Issue 18 - article #1
- Anirudh Chiti, Anna Frebel, Alexander P. Ji, Mohammad K. Mardini, Xiaowei Ou, Joshua D. Simon, Kaitlin C. Rasmussen, Helmut Jerjen, Dongwon Kim, John E. Norris
- http://arxiv.org/abs/2205.01740
Evidence from Disrupted Halo Dwarfs that $r$-process Enrichment via Neutron Star Mergers is Delayed by $gtrsim500$ Myrs. (arXiv:2110.14652v1 [astro-ph.GA])
- Virtual Journal - Volume 19, Issue 44 - article #4
- Rohan P. Naidu, Alexander P. Ji, Charlie Conroy, Ana Bonaca, Yuan-Sen Ting, Dennis Zaritsky, Lieke A. C. van Son, Floor S. Broekgaarden, Sandro Tacchella, Vedant Chandra, Nelson Caldwell, Phillip Cargile, Joshua S. Speagle
- http://arxiv.org/abs/2110.14652
Simultaneous Constraints on the Star Formation History and Nucleosynthesis of Sculptor dSph. (arXiv:2110.01690v1 [astro-ph.GA])
- Virtual Journal - Volume 19, Issue 41 - article #2
- Mithi A. C. de los Reyes, Evan N. Kirby, Alexander P. Ji, Evan H. Nuñez
- http://arxiv.org/abs/2110.01690
R -process-rich Stellar Streams in the Milky Way
- Virtual Journal - Volume 19, Issue 19 - article #18
- Maude Gull, Anna Frebel, Karina Hinojosa, Ian U. Roederer, Alexander P. Ji,, Kaley Brauer
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/912/1/52
Collapsar R-Process Yields Can Reproduce [Eu/Fe] Abundance Scatter in Metal-Poor Stars. (arXiv:2010.15837v1 [astro-ph.HE])
- Virtual Journal - Volume 18, Issue 45 - article #1
- Kaley Brauer, Alexander P. Ji, Maria R. Drout, Anna Frebel
- http://arxiv.org/abs/2010.15837
The Southern Stellar Stream Spectroscopic Survey ( S 5 ): Chemical Abundances of Seven Stellar Streams
- Virtual Journal - Volume 18, Issue 39 - article #7
- Alexander P. Ji, Ting S. Li, Terese T. Hansen, Andrew R. Casey, Sergey E. Koposov, Andrew B. Pace, Dougal Mackey, Geraint F. Lewis, Jeffrey D. Simpson, Joss Bland-Hawthorn, Lara R. Cullinane, Gary. S. Da Costa, Kohei Hattori, Sarah L. Martell, Kyler Kuehn, Denis Erkal, Nora Shipp, Zhen Wan,, Daniel B. Zucker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/160/4/181
The tidal remnant of an unusually metal-poor globular cluster. (arXiv:2007.14577v1 [astro-ph.GA])
- Virtual Journal - Volume 18, Issue 31 - article #9
- Zhen Wan, Geraint F. Lewis, Ting S. Li, Jeffrey D. Simpson, Sarah L. Martell, Daniel B. Zucker, Jeremy R. Mould, Denis Erkal, Andrew B. Pace, Dougal Mackey, Alexander P. Ji, Sergey E. Koposov, Kyler Kuehn, Nora Shipp, Eduardo Balbinot, Joss Bland-Hawthorn, Andrew R. Casey, Gary S. Da Costa, Prajwal Kafle, Sanjib Sharma, Gayandhi M. De Silva
- http://arxiv.org/abs/2007.14577
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: 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 Origin of r -process Enhanced Metal-poor Halo Stars In Now-destroyed Ultra-faint Dwarf Galaxies
- Virtual Journal - Volume 17, Issue 6 - article #19
- Kaley Brauer, Alexander P. Ji, Anna Frebel, Gregory A. Dooley, Facundo A. GÃ³mez,, Brian W. OâShea
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/871/2/247
Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs. (arXiv:1809.02182v1 [astro-ph.GA])
- Virtual Journal - Volume 16, Issue 37 - article #4
- Alexander P. Ji, Joshua D. Simon, Anna Frebel, Kim A. Venn, Terese T. Hansen
- http://arxiv.org/abs/1809.02182
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
Chemical Abundances of New Member Stars in the Tucana II Dwarf Galaxy
- Virtual Journal - Volume 16, Issue 16 - article #18
- Anirudh Chiti, Anna Frebel, Alexander P. Ji, Helmut Jerjen, Dongwon Kim,, John E. Norris
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/857/1/74
From Actinides to Zinc: Using the Full Abundance Pattern of the Brightest Star in Reticulum II to Distinguish between Different r -process Sites
- Virtual Journal - Volume 16, Issue 14 - article #16
- Alexander P. Ji, Anna Frebel
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/856/2/138
Chemical Abundances of new member stars in the Tucana II dwarf galaxy. (arXiv:1803.01808v1 [astro-ph.GA])
- Virtual Journal - Volume 16, Issue 10 - article #3
- Anirudh Chiti, Anna Frebel, Alexander P. Ji, Helmut Jerjen, Dongwon Kim, John E. Norris
- http://arxiv.org/abs/1803.01808
From actinides to zinc: Using the full abundance pattern of the brightest star in Reticulum II to distinguish between different r-process sites. (arXiv:1802.07272v1 [astro-ph.SR])
- Virtual Journal - Volume 16, Issue 8 - article #11
- Alexander P. Ji, Anna Frebel
- http://arxiv.org/abs/1802.07272
Descendants of the first stars: the distinct chemical signature of second generation stars. (arXiv:1801.05044v1 [astro-ph.GA])
- Virtual Journal - Volume 16, Issue 3 - article #3
- Tilman Hartwig, Naoki Yoshida, Mattis Magg, Anna Frebel, Simon C. O. Glover, Facundo A. Gómez, Brendan Griffen, Miho N. Ishigaki, Alexander P. Ji, Ralf S. Klessen, Brian W. O'Shea, Nozomu Tominaga
- http://arxiv.org/abs/1801.05044
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
CHEMICAL DIVERSITY IN THE ULTRA-FAINT DWARF GALAXY TUCANA II
- Virtual Journal - Volume 14, Issue 47 - article #27
- Alexander P. Ji, Anna Frebel, Rana Ezzeddine,, Andrew R. Casey
- The Astrophysical Journal Letters
- http://iopscience.iop.org/2041-8205/832/1/L3
Tracing the first stars and galaxies of the Milky Way. (arXiv:1611.00759v1 [astro-ph.GA])
- Virtual Journal - Volume 14, Issue 45 - article #9
- Brendan F. Griffen, Gregory A. Dooley, Alexander P. Ji, Brian W. O'Shea, Facundo A. Gómez, Anna Frebel
- http://arxiv.org/abs/1611.00759
Complete Element Abundances of Nine Stars in the r-process Galaxy Reticulum II
- Virtual Journal - Volume 14, Issue 43 - article #42
- Alexander P. Ji, Anna Frebel, Joshua D. Simon,, Anirudh Chiti
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/830/2/93
Chemical Diversity in the Ultra-faint Dwarf Galaxy Tucana II. (arXiv:1609.02915v1 [astro-ph.GA])
- Virtual Journal - Volume 14, Issue 38 - article #2
- Alexander P. Ji, Anna Frebel, Rana Ezzeddine, Andrew R. Casey
- http://arxiv.org/abs/1609.02915
Complete element abundances of nine stars in the r-process galaxy Reticulum II. (arXiv:1607.07447v1 [astro-ph.GA])
- Virtual Journal - Volume 14, Issue 31 - article #3
- Alexander P. Ji, Anna Frebel, Joshua D. Simon, Anirudh Chiti
- http://arxiv.org/abs/1607.07447
The Caterpillar Project: A Large Suite of Milky Way Sized Halos
- Virtual Journal - Volume 14, Issue 9 - article #39
- Brendan F. Griffen, Alexander P. Ji, Gregory A. Dooley, Facundo A. GÃ³mez, Mark Vogelsberger, Brian W. O'Shea, and Anna Frebel
- The Astrophysical Journal - Volume: 818, Issue: 1
- View article PDF (4.15 MB)
High-resolution Spectroscopy of Extremely Metal-poor Stars in the Least-evolved Galaxies: Bootes II
- Virtual Journal - Volume 14, Issue 6 - article #30
- Alexander P. Ji, Anna Frebel, Joshua D. Simon, and Marla Geha
- The Astrophysical Journal - Volume: 817, Issue: 1
- View article PDF (1.70 MB)
Copious r-process enrichment from a single event in an ancient dwarf galaxy
- Virtual Journal - Volume 13, Issue 46 - article #4
- Alexander P. Ji, Anna Frebel, Anirudh Chiti, Joshua D. Simon
- arXiv.org - Astrophysics - Volume: 2015, Issue: 11 Dec
- arXiv:1512.01558 [pdf]
High-resolution spectroscopy of extremely metal-poor stars in the least evolved galaxies: Bootes II
- Virtual Journal - Volume 13, Issue 40 - article #10
- Alexander P. Ji, Anna Frebel, Joshua D. Simon, Marla Geha
- arXiv.org - Astrophysics - Volume: 2015, Issue: 30 Oct
- arXiv:1510.07632 [pdf, other]
Preserving chemical signatures of primordial star formation in the first low-mass stars
- Virtual Journal - Volume 13, Issue 39 - article #42
- Alexander P. Ji, Anna Frebel, and Volker Bromm
- Monthly Notices of the Royal Astronomical Society - Volume: 454, Issue: 1
- Abstract Full Text (HTML) Full Text (PDF)
The Chemical Imprint of Silicate Dust on the Most Metal-poor Stars
- Virtual Journal - Volume 12, Issue 8 - article #42
- Alexander P. Ji, Anna Frebel, and Volker Bromm
- The Astrophysical Journal - Volume: 782, Issue: 2
- View article PDF (1017 KB)
The Chemical Imprint of Dust on the Most Metal-Poor Stars
- Virtual Journal - Volume 11, Issue 28 - article #10
- Alexander P. Ji, Anna Frebel, Volker Bromm
- arXiv.org - Astrophysics - Volume: 2013, Issue: 12 Jul
- arXiv:1307.2239 [pdf, other]

Results 1 - 40 of 40

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