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Results 1 - 32 of 32

New Neutron-capture Measurements in 23 Open Clusters. I. The r-Process
- Virtual Journal - Volume 14, Issue 25 - article #24
- Jamie C. Overbeek, Eileen D. Friel, and Heather R. Jacobson
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/824/2/75
CD -24_17504 revisited: a new comprehensive element abundance analysis
- Virtual Journal - Volume 13, Issue 25 - article #5
- Heather R. Jacobson, Anna Frebel (MIT)
- arXiv.org - Astrophysics - Volume: 2015, Issue: 10 Jul
- arXiv:1507.02304 [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]
Nucleosynthesis in a Primordial Supernova: Carbon and Oxygen Abundances in SMSS J031300.36–670839.3
- Virtual Journal - Volume 13, Issue 24 - article #35
- Michael S. Bessell, Remo Collet, Stefan C. Keller, Anna Frebel, Alexander Heger, Andrew R. Casey, Thomas Masseron, Martin Asplund, Heather R. Jacobson, Karin Lind, Anna F. Marino, John E. Norris, David Yong, Gary Da Costa, Conrad Chan, Zazralt Magic, Brian Schmidt, and Patrick Tisserand
- The Astrophysical Journal Letters - Volume: 806, Issue: 1
- View article PDF (1.55 MB)
High-Resolution Spectroscopic Study of Extremely Metal-Poor Star Candidates from the SkyMapper Survey
- Virtual Journal - Volume 13, Issue 15 - article #4
- Heather. R. Jacobson (MIT), Stefan Keller (ANU), Anna Frebel (MIT), Andrew R. Casey (U. Cambridge), Martin Asplund (ANU), Michael S. Bessell (ANU), Gary S. Da Costa (ANU), Karin Lind (U. Uppsala), Anna F. Marino (ANU), John E. Norris (ANU), Jose M. Pena (MIT), Brian P. Schmidt (ANU), Patrick Tisserand (ANU), Jennifer M. Walsh (Harvard), David Yong (ANU), Qinsi Yu (MIT)
- arXiv.org - Astrophysics - Volume: 2015, Issue: 17 Apr
- arXiv:1504.03344 [pdf, other]
Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy
- Virtual Journal - Volume 13, Issue 13 - article #36
- Joshua D. Simon, Heather R. Jacobson, Anna Frebel, Ian B. Thompson, Joshua J. Adams, and Stephen A. Shectman
- The Astrophysical Journal - Volume: 802, Issue: 2
- View article PDF (368 KB)
Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy
- Virtual Journal - Volume 12, Issue 25 - article #15
- Joshua D. Simon (Carnegie Observatories), Heather R. Jacobson, Anna Frebel (MIT), Ian B. Thompson (Carnegie Observatories), Joshua J. Adams (ASML), Stephen A. Shectman (Carnegie Observatories)
- arXiv.org - Astrophysics - Volume: 2014, Issue: 19 Dec
- arXiv:1412.5176 [pdf, ps, other]
Detection of Neutral Phosphorus in the Near-ultraviolet Spectra of Late-type Stars
- Virtual Journal - Volume 12, Issue 25 - article #91
- Ian U. Roederer, Heather R. Jacobson, Thanawuth Thanathibodee, Anna Frebel, and Elizabeth Toller
- The Astrophysical Journal - Volume: 797, Issue: 1
- View article PDF (648 KB)
The Chemical Evolution of Phosphorus
- Virtual Journal - Volume 12, Issue 24 - article #50
- Heather R. Jacobson (MIT), Thanawuth Thanathibodee (MIT), Anna Frebel (MIT), Ian U. Roederer (Michigan), Gabriele Cescutti (AIP), Francesca Matteucci (INAF Trieste)
- arXiv.org - Astrophysics - Volume: 2014, Issue: 7 Nov
- arXiv:1410.8538 [pdf, ps, other]
The Chemical Evolution of Phosphorus
- Virtual Journal - Volume 12, Issue 24 - article #111
- Heather R. Jacobson, Thanawuth Thanathibodee, Anna Frebel, Ian U. Roederer, Gabriele Cescutti, and Francesca Matteucci
- The Astrophysical Journal Letters - Volume: 796, Issue: 2
- View article PDF (453 KB)
Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
- Virtual Journal - Volume 12, Issue 22 - article #45
- R. Smiljanic, A. J. Korn, M. Bergemann, A. Frasca, L. Magrini, T. Masseron, E. Pancino, G. Ruchti, I. San Roman, L. Sbordone, S. G. Sousa, H. Tabernero, G. Tautvaisiene, M. Valentini, M. Weber, C. C. Worley, V. Zh. Adibekyan, C. Allende Prieto, G. Barisevicius, K. Biazzo, S. Blanco-Cuaresma, P. Bonifacio, A. Bragaglia, E. Caffau, T. Cantat-Gaudin, Y. Chorniy, P. de Laverny, E. Delgado-Mena, P. Donati, S. Duffau, E. Franciosini, E. Friel, D. Geisler, J. I. Gonzalez Hernandez, P. Gruyters, G. Guiglion, C. J. Hansen, U. Heiter, V. Hill, H. R. Jacobson, P. Jofre, H. Jonsson, A. C. Lanzafame, C. Lardo, H. G. Ludwig, E. Maiorca, S. Mikolaitis, D. Montes, T. Morel, A. Mucciarelli, C. Munoz, T. Nordlander, L. Pasquini, E. Puzeras, A. Recio-Blanco, N. Ryde, G. Sacco, N. C. Santos, A. M. Serenelli, et al. (43 additional authors not shown)
- arXiv.org - Astrophysics - Volume: 2014, Issue: 5 Sep
- arXiv:1409.0568 [pdf, other]
The SLUGGS survey: Exploring the metallicity gradients of nearby early-type galaxies to large radii
- Virtual Journal - Volume 12, Issue 20 - article #39
- Nicola Pastorello, Duncan A. Forbes, Caroline Foster, Jean P. Brodie, Christopher Usher, Aaron J. Romanowsky, Jay Strader, Jacob A. Arnold
- arXiv.org - Astrophysics - Volume: 2014, Issue: 16 May
- arXiv:1405.2338 [pdf, other]
The SEGUE K Giant Survey. II. A Catalog of Distance Determinations for the SEGUE K Giants in the Galactic Halo
- Virtual Journal - Volume 12, Issue 17 - article #47
- Xiang-Xiang Xue, Zhibo Ma, Hans-Walter Rix, Heather L. Morrison, Paul Harding, Timothy C. Beers, Inese I. Ivans, Heather R. Jacobson, Jennifer Johnson, Young Sun Lee, Sara Lucatello, Constance M. Rockosi, Jennifer S. Sobeck, Brian Yanny, Gang Zhao, and Carlos Allende Prieto
- The Astrophysical Journal - Volume: 784, Issue: 2
- View article PDF (1.21 MB)
Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815
- Virtual Journal - Volume 12, Issue 16 - article #18
- E. D. Friel, P. Donati, A. Bragaglia, H. R. Jacobson, L. Magrini, L. Prisinzano, S. Randich, M. Tosi, T. Cantat-Gaudin, A. Vallenari, et al. (27 more) R. Smiljanic, G. Carraro, R. Sordo, E. Maiorca, G. TautvaiÅ¡ien*error*Ä, P. Sestito, S. Zaggia, F. M. JimÃ©nez-Esteban, G. Gilmore, R. D. Jeffries, E. Alfaro, T. Bensby, S. E. Koposov, A. J. Korn, E. Pancino, A. Recio-Blanco, E. Franciosini, V. Hill, R. J. Jackson, P. de Laverny, L. Morbidelli, G. G. Sacco, C. C. Worley, A. Hourihane, M. T. Costado, P. JofrÃ© and K. Lind
- Astronomy and Astrophysics - Volume: 563, Issue: March 2014
- http://dx.doi.org/10.1051/0004-6361/201323215
  Abstract Full HTML PDF (2.311 MB) References NASA ADS Abstract Service
The Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815
- Virtual Journal - Volume 12, Issue 14 - article #11
- E. D. Friel, P. Donati, A. Bragaglia, H. R. Jacobson, L. Magrini, L. Prisinzano, S. Randich, M. Tosi, T. Cantat-Gaudin, A. Vallenari, R. Smiljanic, G. Carraro, R. Sordo, E. Maiorca, G. Tautvaisviene, P. Sestito, S. Zaggia, F. M. Jimenez-Esteban, G. Gilmore, R. D. Jeffries, E. Alfaro, T. Bensby, S. E. Koposov, A. J. Korn, E. Pancino, A. Recio-Blanco, E. Franciosini, V. Hill, R. J. Jackson, P. de Laverny, L. Morbidelli, G. G. Sacco, C. C. Worley, A. Hourihane, M. T. Costado, P. Jofre, K. Lind
- arXiv.org - Astrophysics - Volume: 2014, Issue: 4 Apr
- arXiv:1403.7451 [pdf, ps, other]
A single low-energy, iron-poor supernova as the source of metals in the star SMSS J 031300.36-670839.3
- Virtual Journal - Volume 12, Issue 7 - article #2
- S. C. Keller, M. S. Bessell, A. Frebel, A. R. Casey, M. Asplund, H. R. Jacobson, K. Lind, J. E. Norris, D. Yong, A. Heger, Z. Magic, G. S. Da Costa, B. P. Schmidt, P. Tisserand
- arXiv.org - Astrophysics - Volume: 2014, Issue: 14 Feb
- arXiv:1402.1517 [pdf]
Observational nuclear astrophysics: neutron-capture element abundances in old, metal-poor stars
- Virtual Journal - Volume 11, Issue 36 - article #6
- Heather R. Jacobson, Anna Frebel
- arXiv.org - Astrophysics - Volume: 2013, Issue: 6 Sep
- arXiv:1309.0037 [pdf, ps, other]
Deriving Stellar Effective Temperatures of Metal-poor Stars with the Excitation Potential Method
- Virtual Journal - Volume 11, Issue 20 - article #26
- Anna Frebel, Andrew R. Casey, Heather R. Jacobson, and Qinsi Yu
- The Astrophysical Journal - Volume: 769, Issue: 1
- Abstract References Full text PDF (625 KB) Enhanced article HTML
Deriving Stellar Effective Temperatures of Metal-Poor Stars with the Excitation Potential Method
- Virtual Journal - Volume 11, Issue 15 - article #2
- Anna Frebel (MIT), Andrew R. Casey (ANU), Heather R. Jacobson (MIT), Qinsi Yu (MIT)
- arXiv.org - Astrophysics - Volume: 2013, Issue: 12 Apr
- arXiv:1304.2396 [pdf, ps, other]
Zirconium, Barium, Lanthanum and Europium Abundances in Open Clusters
- Virtual Journal - Volume 11, Issue 12 - article #12
- H. R. Jacobson, E. D. Friel
- arXiv.org - Astrophysics - Volume: 2013, Issue: 22 Mar
- arXiv:1303.4283 [pdf, ps, other]
Zirconium, Barium, Lanthanum, and Europium Abundances in Open Clusters
- Virtual Journal - Volume 11, Issue 12 - article #19
- Heather R. Jacobson and Eileen D. Friel
- Astronomical Journal - Volume: 145, Issue: 4
- doi:10.1088/0004-6256/145/4/107 Tag this article
The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
- Virtual Journal - Volume 10, Issue 52 - article #61
- Christopher P. Ahn, Rachael Alexandroff, Carlos Allende Prieto, Scott F. Anderson, Timothy Anderton, Brett H. Andrews, Ãric Aubourg, Stephen Bailey, Eduardo Balbinot, Rory Barnes, Julian Bautista, Timothy C. Beers, Alessandra Beifiori, Andreas A. Berlind, Vaishali Bhardwaj, Dmitry Bizyaev, Cullen H. Blake, Michael R. Blanton, Michael Blomqvist, John J. Bochanski, Adam S. Bolton, Arnaud Borde, Jo Bovy, W. N. Brandt, J. Brinkmann, Peter J. Brown, Joel R. Brownstein, Kevin Bundy, N. G. Busca, William Carithers, Aurelio R. Carnero, Michael A. Carr, Dana I. Casetti-Dinescu, Yanmei Chen, Cristina Chiappini, Johan Comparat, Natalia Connolly, Justin R. Crepp, Stefano Cristiani, Rupert A. C. Croft, Antonio J. Cuesta, Luiz N. da Costa, James R. A. Davenport, Kyle S. Dawson, Roland de Putter, Nathan De Lee, TimothÃ©e Delubac, Saurav Dhital, Anne Ealet, Garrett L. Ebelke, Edward M. Edmondson, Daniel J. Eisenstein, S. Escoffier, Massimiliano Esposito, Michael L. Evans, Xiaohui Fan, Bruno FemenÃa CastellÃ¡, Emma FernÃ¡ndez Alvar, Leticia D. Ferreira, N. Filiz Ak, Hayley Finley, Scott W. Fleming, Andreu Font-Ribera, Peter M. Frinchaboy, D. A. GarcÃa-HernÃ¡ndez, A. E. GarcÃa PÃ©rez, Jian Ge, R. GÃ©nova-Santos, Bruce A. Gillespie, LÃ©o Girardi, Jonay I. GonzÃ¡lez HernÃ¡ndez, Eva K. Grebel, James E. Gunn, Hong Guo, Daryl Haggard, Jean-Christophe Hamilton, David W. Harris, Suzanne L. Hawley, Frederick R. Hearty, Shirley Ho, David W. Hogg, Jon A. Holtzman, Klaus Honscheid, J. Huehnerhoff, Inese I. Ivans, Å½eljko IveziÄ, Heather R. Jacobson, Linhua Jiang, Jonas Johansson, Jennifer A. Johnson, Guinevere Kauffmann, David Kirkby, Jessica A. Kirkpatrick, Mark A. Klaene, Gillian R. Knapp, Jean-Paul Kneib, Jean-Marc Le Goff, Alexie Leauthaud, Khee-Gan Lee, Young Sun Lee, Daniel C. Long, Craig P. Loomis, Sara Lucatello, Britt Lundgren, Robert H. Lupton, Bo Ma, Zhibo Ma, Nicholas MacDonald, Claude E. Mack, Suvrath Mahadevan, Marcio A. G. Maia, Steven R. Majewski, Martin Makler, Elena Malanushenko, Viktor Malanushenko, A. Manchado, Rachel Mandelbaum, Marc Manera, Claudia Maraston, Daniel Margala, Sarah L. Martell, Cameron K. McBride, Ian D. McGreer, Richard G. McMahon, Brice MÃ©nard, Sz. Meszaros, Jordi Miralda-EscudÃ©, Antonio D. Montero-Dorta, Francesco Montesano, Heather L. Morrison, Demitri Muna, Jeffrey A. Munn, Hitoshi Murayama, Adam D. Myers, A. F. Neto, Duy Cuong Nguyen, Robert C. Nichol, David L. Nidever, Pasquier Noterdaeme, SebastiÃ¡n E. Nuza, Ricardo L. C. Ogando, Matthew D. Olmstead, Daniel J. Oravetz, Russell Owen, Nikhil Padmanabhan, Nathalie Palanque-Delabrouille, Kaike Pan, John K. Parejko, Prachi Parihar, Isabelle PÃ¢ris, Petchara Pattarakijwanich, Joshua Pepper, Will J. Percival, Ismael PÃ©rez-Fournon, Ignasi PÃ©rez-RÃ fols, Patrick Petitjean, Janine Pforr, Matthew M. Pieri, Marc H. Pinsonneault, G. F. Porto de Mello, Francisco Prada, Adrian M. Price-Whelan, M. Jordan Raddick, Rafael Rebolo, James Rich, Gordon T. Richards, Annie C. Robin, Helio J. Rocha-Pinto, Constance M. Rockosi, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Graziano Rossi, J. A. RubiÃ±o-Martin, Lado Samushia, J. Sanchez Almeida, Ariel G. SÃ¡nchez, BasÃlio Santiago, Conor Sayres, David J. Schlegel, Katharine J. Schlesinger, Sarah J. Schmidt, Donald P. Schneider, Mathias Schultheis, Axel D. Schwope, C. G. ScÃ³ccola, Uros Seljak, Erin Sheldon, Yue Shen, Yiping Shu, Jennifer Simmerer, Audrey E. Simmons, Ramin A. Skibba, M. F. Skrutskie, A. Slosar, Flavia Sobreira, Jennifer S. Sobeck, Keivan G. Stassun, Oliver Steele, Matthias Steinmetz, Michael A. Strauss, Alina Streblyanska, Nao Suzuki, Molly E. C. Swanson, Tomer Tal, Aniruddha R. Thakar, Daniel Thomas, Benjamin A. Thompson, Jeremy L. Tinker, Rita Tojeiro, Christy A. Tremonti, M. Vargas MagaÃ±a, Licia Verde, Matteo Viel, Shailendra K. Vikas, Nicole P. Vogt, David A. Wake, Ji Wang, Benjamin A. Weaver, David H. Weinberg, Benjamin J. Weiner, Andrew A. West, Martin White, John C. Wilson, John P. Wisniewski, W. M. Wood-Vasey, Brian Yanny, Christophe YÃ¨che, Donald G. York, O. Zamora, Gail Zasowski, Idit Zehavi, Gong-Bo Zhao, Zheng Zheng, Guangtun Zhu, and Joel C. Zinn
- The Astrophysical Journal Supplement - Volume: 203, Issue: 2
- Abstract References Cited by Full text PDF (1.97 MB) View as HTML
A Catalog of Distance Determinations for the SEGUE K giants in the Galactic Halo
- Virtual Journal - Volume 10, Issue 45 - article #1
- Xiang-Xiang Xue, Zhibo Ma, Hans-Walter Rix, Heather L. Morrison, Paul Harding, Timothy C. Beers, Inese I. Ivans, Heather R. Jacobson, Jennifer Johnson, Young Sun Lee, Sara Lucatello, Constance M. Rockosi, Jennifer S. Sobeck, Brian Yanny
- arXiv.org - Astrophysics - Volume: 2012, Issue: 9 Nov
- arXiv:1211.0549 [pdf, ps, other]
The SLUGGS Survey: NGC 3115, A Critical Test Case for Metallicity Bimodality in Globular Cluster Systems
- Virtual Journal - Volume 10, Issue 44 - article #67
- Jean P. Brodie, Christopher Usher, Charlie Conroy, Jay Strader, Jacob A. Arnold, Duncan A. Forbes, and Aaron J. Romanowsky
- The Astrophysical Journal Letters - Volume: 759, Issue: 2
- Abstract References Full text PDF (331 KB) View as HTML
The SLUGGS Survey: Calcium Triplet-based Spectroscopic Metallicities for Over 900 Globular Clusters
- Virtual Journal - Volume 10, Issue 31 - article #12
- Christopher Usher, Duncan A. Forbes, Jean P. Brodie, Caroline Foster, Lee R. Spitler, Jacob A. Arnold, Aaron J. Romanowsky, Jay Strader, Vincenzo Pota
- arXiv.org - Astrophysics - Volume: 2012, Issue: 3 Aug
- arXiv:1207.6402 [pdf, other]
A Chemical Abundance Study of 10 Open Clusters Based on WIYN
- Virtual Journal - Volume 9, Issue 37 - article #26
- Heather R. Jacobson, Catherine A. Pilachowski and Eileen D. Friel
- Astronomical Journal - Volume: 142, Issue: 2
- doi:10.1088/0004-6256/142/2/59 Tag this article
A Chemical Abundance Study of 10 Open Clusters Based on WIYN-Hydra Spectroscopy
- Virtual Journal - Volume 9, Issue 29 - article #1
- H. R. Jacobson, C. A. Pilachowski, E. D. Friel
- arXiv.org - Astrophysics - Volume: 2011, Issue: 22 Jul
- arXiv:1107.4139 [pdf, ps, other]
A Chemical Abundance Study of Red Giants in Open Clusters NGC 2204 and NGC 2243
- Virtual Journal - Volume 9, Issue 4 - article #25
- Heather R. Jacobson, Eileen D. Friel and Catherine A. Pilachowski
- Astronomical Journal - Volume: 141, Issue: 2
- doi: 10.1088/0004-6256/141/2/58 Tag this article
Abundances of Red Giants in Old Open Clusters. V. Be 31, Be 32, Be 39, M 67, NGC 188, and NGC 1193
- Virtual Journal - Volume 8, Issue 18 - article #18
- Eileen D. Friel, Heather R. Jacobson, and Catherine A. Pilachowski
- Astronomical Journal - Volume: 139, Issue: 5
- Abstract References Full text PDF (914 KB) HTML with Enhancements
The evolution of planetary nebulae VI. On the chemical composition of the metal-poor PN G135.9+55.9
- Virtual Journal - Volume 8, Issue 2 - article #11
- C. Sandin, R. Jacob, D. Schönberner, M. Steffen, M.M. Roth
- arXiv.org - Astrophysics - Volume: 2010, Issue: 8 Jan
- arXiv:0912.5430 [ps, pdf, other]
Abundances of Red Giants in Old Open Clusters. IV. NGC 1817, NGC 1883, NGC 2141, and NGC 2158
- Virtual Journal - Volume 7, Issue 20 - article #20
- <em >Heather R. Jacobson, Eileen D. Friel, and Catherine A. Pilachowski</em&gt,
- Astronomical Journal - Volume: 137, Issue: 6
- Abstract | References

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