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Results 1 - 48 of 48

The Ages of Galactic Bulge Stars with Realistic Uncertainties
- Volume 18, Issue 13 - article #15
- Meridith Joyce, Christian I. Johnson, Tommaso Marchetti, R. Michael Rich, Iulia Simion, John Bourke
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/acb692
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II. (arXiv:2207.03499v2 [astro-ph.GA] UPDATED)
- Volume 18, Issue 8 - article #6
- 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
- Volume 18, Issue 7 - article #12
- 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
HST Observations of the Globular Cluster NGC 6402 (M14) and Its Peculiar Multiple Populations
- Volume 17, Issue 6 - article #4
- Francesca DâAntona, Antonino P. Milone, Christian I. Johnson, Marco Tailo, Enrico Vesperini, Vittoria Caloi, Paolo Ventura, Anna Fabiola Marino,, Flavia DellâAgli
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/925/2/192
HST observations of the globular cluster NGC 6402 (M14) and its peculiar multiple populations. (arXiv:2201.02546v1 [astro-ph.SR])
- Volume 17, Issue 2 - article #2
- Francesca D'Antona, Antonino P. Milone, Christian I. Johnson, Marco Tailo, Enrico Vesperini, Vittoria Caloi, Paolo Ventura, Anna Fabiola Marino, Flavia Dell'Agli
- http://arxiv.org/abs/2201.02546
Difference in Chemical Composition between the Bright and Faint Red Clump Stars in the Milky Way Bulge
- Volume 16, Issue 5 - article #8
- Dongwook Lim, Young-Wook Lee, Andreas Koch, Seungsoo Hong, Christian I. Johnson, Jaeyeon Kim, Chul Chung, Mario Mateo,, John I. Bailey III
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/907/1/47
Blanco DECam Bulge Survey (BDBS) II: Project Performance, Data Analysis, and Early Science Results. (arXiv:2008.09257v1 [astro-ph.GA])
- Volume 15, Issue 35 - article #1
- Christian I. Johnson, R. Michael Rich, Michael D. Young, Iulia T. Simion, William I. Clarkson, Catherine A. Pilachowski, Scott Michael, Andrea Kunder, Andreas Koch, A. Katherina Vivas
- http://arxiv.org/abs/2008.09257
The Blanco DECam Bulge Survey. I. The Survey Description and Early Results. (arXiv:2008.09255v1 [astro-ph.GA])
- Volume 15, Issue 35 - article #7
- R. Michael Rich, Christian I. Johnson, Michael Young, Iulia Simion, William Clarkson, Catherine Pilachowski, Scott Michael, Andrea Kunder, A Katherine Vivas, Andreas Koch, Tommaso Marchett, Rodrigo Ibata, Nicolas Martin, Annie C. Robin, Nadege Lagard, Michelle Collins, Zeljko Ivezic, Roberto de Propris, Juntai Shen
- http://arxiv.org/abs/2008.09255
The Bulge Radial Velocity Assay for RR Lyrae Stars (BRAVA-RR) DR2: A Bimodal Bulge?
- Volume 15, Issue 21 - article #5
- Andrea Kunder, Angeles PÃ©rez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm,, Jennifer Wojno
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/159/6/270
The Most Metal-poor Stars in Omega Centauri (NGC 5139)
- Volume 15, Issue 19 - article #9
- Christian I. Johnson, Andrea K. Dupree, Mario Mateo, John I. Bailey III, Edward W. Olszewski,, Matthew G. Walker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/159/6/254
The Bulge Radial Velocity Assay for RR Lyrae stars (BRAVA-RR) DR2: a Bimodal Bulge?. (arXiv:2004.11382v1 [astro-ph.SR])
- Volume 15, Issue 18 - article #5
- Andrea Kunder, Angeles Perez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm, Jennifer Wojno
- http://arxiv.org/abs/2004.11382
The Most Metal-poor Stars in Omega Centauri (NGC 5139). (arXiv:2004.09023v1 [astro-ph.SR])
- Volume 15, Issue 17 - article #11
- Christian I. Johnson, Andrea K. Dupree, Mario Mateo, John I. Bailey III, Edward W. Olszewski, Matthew G. Walker
- http://arxiv.org/abs/2004.09023
The Globular Cluster Origin of the Milky Way Outer Bulge: Evidence from Sodium Bimodality
- Volume 14, Issue 23 - article #5
- Young-Wook Lee, Jenny J. Kim, Christian I. Johnson, Chul Chung, Sohee Jang, Dongwook Lim,, Yijung Kang
- The Astrophysical Journal Letters
- http://iopscience.iop.org/2041-8205/878/1/L2
The Globular Cluster Origin of the Milky Way Outer Bulge: Evidence from Sodium Bimodality. (arXiv:1905.08809v1 [astro-ph.GA])
- Volume 14, Issue 21 - article #5
- Young-Wook Lee, Jenny J. Kim, Christian I. Johnson, Chul Chung, Sohee Jang, Dongwook Lim, Yijung Kang
- http://arxiv.org/abs/1905.08809
Radial Velocities of RR Lyrae Stars in and around NGC 6441
- Volume 13, Issue 13 - article #10
- Andrea Kunder, Arthur Mills, Joseph Edgecomb, Mathew Thomas, Levi Schilter, Craig Boyle, Stephen Parker, Gordon Bellevue, R. Michael Rich, Andreas Koch, Christian I. Johnson,, David M. Nataf
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/155/4/171
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569. (arXiv:1801.10475v1 [astro-ph.SR])
- Volume 13, Issue 5 - article #3
- Christian I. Johnson, R. Michael Rich, Nelson Caldwell, Mario Mateo, John I. Bailey III, Edward W. Olszewski, Matthew G. Walker
- http://arxiv.org/abs/1801.10475
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
- Volume 13, Issue 3 - article #8
- Christian I. Johnson, R. Michael Rich, Nelson Caldwell, Mario Mateo, John I. Bailey III, Edward W. Olszewski,, Matthew G. Walker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/155/2/71
Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229
- Volume 12, Issue 38 - article #11
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich,, Matthew G. Walker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/154/4/155
Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229. (arXiv:1709.00048v1 [astro-ph.SR])
- Volume 12, Issue 36 - article #3
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Matthew G. Walker
- http://arxiv.org/abs/1709.00048
Chemical Complexity in the Eu-enhanced Monometallic Globular Cluster NGC 5986. (arXiv:1705.10840v1 [astro-ph.SR])
- Volume 12, Issue 22 - article #1
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Mario Mateo, John I. Bailey III, Edward W. Olszewski, Matthew G. Walker
- http://arxiv.org/abs/1705.10840
Crater 2: An Extremely Cold Dark Matter Halo
- Volume 12, Issue 15 - article #6
- Nelson Caldwell, Matthew G. Walker, Mario Mateo, Edward W. Olszewski, Sergey Koposov, Vasily Belokurov, Gabriel Torrealba, Alex Geringer-Sameth,, Christian I. Johnson
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/839/1/20
A Chemical Composition Survey of the Iron-Complex Globular Cluster NGC 6273 (M 19). (arXiv:1611.05830v1 [astro-ph.SR])
- Volume 11, Issue 47 - article #1
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Mario Mateo, John I. Bailey, William I. Clarkson, Edward W. Olszewski, Matthew G. Walker
- http://arxiv.org/abs/1611.05830
The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366. (arXiv:1606.08491v1 [astro-ph.SR])
- Volume 11, Issue 27 - article #9
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Catherine A. Pilachowski, Tiffany Hsyu
- http://arxiv.org/abs/1606.08491
The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
- Volume 11, Issue 27 - article #12
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Catherine A. Pilachowski,, Tiffany Hsyu
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/152/1/21
A high-velocity bulge RR Lyrae variable on a halo-like orbit
- Volume 10, Issue 23 - article #2
- Andrea Kunder, R. Michael Rich, Keith Hawkins, Radek Poleski, Jesper Storm, Christian I. Johnson, Juntai Shen, Zhao-Yu Li, Maria Jose Cordero, David M. Nataf, Giuseppe Bono, Alistair R. Walker, Andreas Koch, Roberto De Propris, Andrzej Udalski, Michal K. Szymanski, Igor Soszynski, Grzegorz Pietrzynski, Krzysztof Ulaczyk, Lukasz Wyrzykowski, Pawel Pietrukowicz, Jan Skowron, Szymon Kozlowski, Przemyslaw Mroz
- arXiv.org - Astrophysics - Volume: 2015, Issue: 12 Jun
- arXiv:1506.02664 [pdf, other]
AGB Sodium Abundances in the Globular Cluster 47 Tucanae (NGC 104)
- Volume 10, Issue 5 - article #12
- Christian I. Johnson, Iain McDonald, Catherine A. Pilachowski, Mario Mateo, John I. Bailey III, Maria J. Cordero, Albert A. Zijlstra, Jeffrey D. Crane, Edward Olszewski, Stephen A. Shectman, and Ian Thompson
- Astronomical Journal - Volume: 149, Issue: 2
- View article PDF (1.43 MB)
Light-Element Abundances of Giant Stars in the Globular Cluster M71 (NGC 6838)
- Volume 10, Issue 2 - article #2
- Maria J. Cordero, Catherine A. Pilachowski, Christian I. Johnson, Enrico Vesperini
- arXiv.org - Astrophysics - Volume: 2015, Issue: 16 Jan
- arXiv:1501.03190 [pdf, ps, other]
AGB Sodium Abundances in the Globular Cluster 47 Tucanae (NGC 104)
- Volume 9, Issue 25 - article #15
- Christian I. Johnson, Iain McDonald, Catherine A. Pilachowski, Mario Mateo, John I. Bailey III, Maria J. Cordero, Albert A. Zijlstra, Jeffrey D. Crane, Edward Olszewski, Stephen A. Shectman, Ian Thompson
- arXiv.org - Astrophysics - Volume: 2014, Issue: 19 Dec
- arXiv:1412.4108 [pdf, ps, other]
Light, Alpha, and Fe-peak Element Abundances in the Galactic Bulge
- Volume 9, Issue 22 - article #48
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi, Andrea Kunder, and Andreas Koch
- Astronomical Journal - Volume: 148, Issue: 4
- View article PDF (3.76 MB)
Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge
- Volume 9, Issue 20 - article #7
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi, Andrea Kunder, Andreas Koch
- arXiv.org - Astrophysics - Volume: 2014, Issue: 11 Jul
- arXiv:1407.2282 [pdf, ps, other]
The Metal-poor Knee in the Fornax Dwarf Spheroidal Galaxy
- Volume 9, Issue 17 - article #33
- Benjamin Hendricks, Andreas Koch, Gustavo A. Lanfranchi, Corrado Boeche, Matthew Walker, Christian I. Johnson, Jorge PeÃ±arrubia, and Gerard Gilmore
- The Astrophysical Journal - Volume: 785, Issue: 2
- View article PDF (1.10 MB)
The metal-poor Knee in the Fornax Dwarf Spheroidal Galaxy
- Volume 9, Issue 9 - article #4
- Benjamin Hendricks, Andreas Koch, Gustavo A. Lanfranchi, Corrado Boeche, Matthew Walker, Christian I. Johnson, Jorge Penarrubia, Gerard Gilmore
- arXiv.org - Astrophysics - Volume: 2014, Issue: 28 Feb
- arXiv:1402.6328 [pdf, ps, other]
Detailed Abundances for a Large Sample of Giant Stars in the Globular Cluster 47 Tucanae (NGC 104)
- Volume 8, Issue 45 - article #3
- Maria J. Cordero, Catherine A. Pilachowski, Christian I. Johnson, Iain McDonald, Albert A. Zijlstra, Jennifer Simmerer
- arXiv.org - Astrophysics - Volume: 2013, Issue: 8 Nov
- arXiv:1311.1541 [pdf, ps, other]
Metallicity Distribution Functions, Radial Velocities, and Alpha Element Abundances in Three Off-axis Bulge Fields
- Volume 8, Issue 10 - article #17
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi, Andrea Kunder, Catherine A. Pilachowski, Andreas Koch, and Roberto de Propris
- The Astrophysical Journal - Volume: 765, Issue: 2
- Abstract References Full text PDF (16.11 MB) Enhanced article HTML
Metallicity Distribution Functions, Radial Velocities, and Alpha Element Abundances in Three Off-Axis Bulge Fields
- Volume 8, Issue 8 - article #7
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi, Andrea Kunder, Catherine A. Pilachowski, Andreas Koch, Roberto De Propris
- arXiv.org - Astrophysics - Volume: 2013, Issue: 22 Feb
- arXiv:1302.3679 [pdf, ps, other]
Oxygen and Sodium Abundances in M13 (NGC 6205) Giants: Linking Globular Cluster Formation Scenarios, Deep Mixing, and Post-RGB Evolution
- Volume 7, Issue 29 - article #28
- Christian I. Johnson and Catherine A. Pilachowski
- The Astrophysical Journal Letters - Volume: 754, Issue: 2
- Abstract References Full text PDF (526 KB) HTML with Enhancements
Oxygen and Sodium Abundances in M13 (NGC 6205) Giants: Linking Globular Cluster Formation Scenarios, Deep Mixing, and Post-RGB Evolution
- Volume 7, Issue 28 - article #10
- Christian I. Johnson, Catherine A. Pilachowski
- arXiv.org - Astrophysics - Volume: 2012, Issue: 13 Jul
- arXiv:1207.1919 [pdf, ps, other]
Constraints on the Formation of the Galactic Bulge from Na, Al, and Heavy-element Abundances in Plaut's Field
- Volume 7, Issue 14 - article #27
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi and Jon P. Fulbright
- The Astrophysical Journal - Volume: 749, Issue: 2
- Abstract References Full text PDF (2.37 MB) View as HTML
Constraints on the Formation of the Galactic Bulge from Na, Al, and Heavy Element Abundances in Plaut's Field
- Volume 7, Issue 8 - article #3
- Christian I. Johnson, R. Michael Rich, Chiaki Kobayashi, Jon P. Fulbright
- arXiv.org - Astrophysics - Volume: 2012, Issue: 24 Feb
- arXiv:1202.4481 [pdf, ps, other]
Chemical Abundances of Red Giant Stars in the Globular Cluster M107 (NGC 6171)
- Volume 6, Issue 35 - article #4
- Julia E. O'Connell, Christian I. Johnson, Catherine A. Pilachowski, Geoffrey Burks
- arXiv.org - Astrophysics - Volume: 2011, Issue: 2 Sep
- arXiv:1108.5200 [pdf, ps, other]
Multiple populations in Omega Centauri: a cluster analysis of spectroscopic data
- Volume 6, Issue 22 - article #10
- Raffaele Gratton, Christian I. Johnson, Sara Lucatello, Valentina D'Orazi, Catherine A. Pilachowski
- arXiv.org - Astrophysics - Volume: 2011, Issue: 3 Jun
- arXiv:1105.5544 [pdf, ps, other]
Spitzer spectra of evolved stars in omega Centauri and their low-metallicity dust production
- Volume 6, Issue 17 - article #11
- Iain McDonald, Jacco Th. van Loon, Gregory C. Sloan, Andrea K. Dupree, Albert A. Zijlstra, Martha L. Boyer, Robert D. Gehrz, Aneurin Evans, Charles E. Woodward, Christian I. Johnson
- arXiv.org - Astrophysics - Volume: 2011, Issue: 29 Apr
- arXiv:1104.5155 [pdf, ps, other]
Separating the conjoined red clump in the Galactic Bulge: Kinematics and Abundances
- Volume 6, Issue 14 - article #6
- Roberto De Propris (1), R. Michael Rich (2), Andrea Kunder (1), Christian I. Johnson (2), Andreas Koch (3) Sarah Brough (4), Christopher J. Conselice (5), Madusha Gunawardhana (6), David Palamara (7) Kevin Pimbblet (7), Dinuka Wijesinghe (6) ((1) CTIO, (2) UCLA, (3) University of Leicester, (4) Australian Astronomical Observatory, (5) University of Nottingham, (6) Sydney Institute of Astronomy, University of Sydney (7) Monash University)
- arXiv.org - Astrophysics - Volume: 2011, Issue: 8 Apr
- arXiv:1104.0223 [pdf, ps, other]
Alpha Enhancement and the Metallicity Distribution Function of Plaut's Window
- Volume 6, Issue 11 - article #1
- Christian I. Johnson, R. Michael Rich, Jon P. Fulbright, Elena Valenti, Andrew McWilliam
- arXiv.org - Astrophysics - Volume: 2011, Issue: 18 Mar
- arXiv:1103.2143 [pdf, ps, other]
Chemical Abundances for 855 Giants in the Globular Cluster Omega Centauri (NGC 5139)
- Volume 5, Issue 34 - article #3
- Christian I. Johnson, Catherine A. Pilachowski
- arXiv.org - Astrophysics - Volume: 2010, Issue: 20 Aug
- arXiv:1008.2232 [pdf, other]
Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)
- Volume 3, Issue 28 - article #31
- Christian I. Johnson, Catherine A. Pilachowski, Jennifer Simmerer, and Dustin Schwenk
- The Astrophysical Journal - Volume: 681, Issue: 2
- Abstract-Full Text with Enhancements-PDF Version (1930 kB)
Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)
- Volume 3, Issue 16 - article #5
- Christian I. Johnson, Catherine A. Pilachowski, Jennifer Simmerer, Dustin Schwenk
- arXiv.org - Astrophysics - Volume: 2008, Issue: 17 Apr
- arXiv:0804.2607 [ps, pdf, other]
A MODERATE SAMPLE SIZE, MULTIELEMENT ANALYSIS OF THE GLOBULAR CLUSTER M12 (NGC 6218)
- Volume 1, Issue 43 - article #11
- Christian I. Johnson and Catherine A. Pilachowski
- Astronomical Journal - Volume 132, Issue 6
- Abstract Full Text PDF (558 kB)

Results 1 - 48 of 48

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