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Results 1 - 20 of 20

Radial oxygen and argon abundance gradients of the thin and thicker disc of Andromeda from planetary nebulae. (arXiv:2203.06428v1 [astro-ph.GA])
- Virtual Journal - Volume 20, Issue 11 - article #7
- Souradeep Bhattacharya, Magda Arnaboldi, Nelson Caldwell, Ortwin Gerhard, Chiaki Kobayashi, Johanna Hartke, Kenneth C. Freeman, Alan W. McConnachie, Puragra Guhathakurta
- http://arxiv.org/abs/2203.06428
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
Light Element Discontinuities Suggest an Early Termination of Star Formation in the Globular Cluster NGC 6402 (M14). (arXiv:1903.01951v1 [astro-ph.SR])
- Virtual Journal - Volume 17, Issue 10 - article #3
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich, Mario Mateo, John I. Bailey III
- http://arxiv.org/abs/1903.01951
Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 6229
- Virtual Journal - Volume 15, Issue 38 - article #15
- Christian I. Johnson, Nelson Caldwell, R. Michael Rich,, Matthew G. Walker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/154/4/155
Chemical Complexity in the Eu-enhanced Monometallic Globular Cluster NGC 5986. (arXiv:1705.10840v1 [astro-ph.SR])
- Virtual Journal - Volume 15, 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
A Chemical Composition Survey of the Iron-Complex Globular Cluster NGC 6273 (M 19). (arXiv:1611.05830v1 [astro-ph.SR])
- Virtual Journal - Volume 14, 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])
- Virtual Journal - Volume 14, Issue 27 - article #12
- 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
- Virtual Journal - Volume 14, Issue 27 - article #19
- 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
The Panchromatic Hubble Andromeda Treasury. V. Ages and Masses of the Year 1 Stellar Clusters
- Virtual Journal - Volume 12, Issue 18 - article #47
- Morgan Fouesneau, L. Clifton Johnson, Daniel R. Weisz, Julianne J. Dalcanton, Eric F. Bell, Luciana Bianchi, Nelson Caldwell, Dimitrios A. Gouliermis, Puragra Guhathakurta, Jason Kalirai, SÃƒÂ¸ren S. Larsen, Hans-Walter Rix, Anil C. Seth, Evan D. Skillman, and Benjamin F. Williams
- The Astrophysical Journal - Volume: 786, Issue: 2
- View article PDF (4.49 MB)
Star Clusters in M31. V. Evidence for Self-Enrichment in Old M31 Clusters from Integrated Spectroscopy
- Virtual Journal - Volume 11, Issue 36 - article #11
- Ricardo P. Schiavon, Nelson Caldwell, Charlie Conroy, Genevieve J. Graves, Jay Strader, Lauren A. MacArthur, Stephane Courteau, Paul Harding
- arXiv.org - Astrophysics - Volume: 2013, Issue: 6 Sep
- arXiv:1308.6590 [pdf, ps, other]
The Panchromatic Hubble Andromeda Treasury. III. Measuring Ages and Masses of Partially Resolved Stellar Clusters
- Virtual Journal - Volume 10, Issue 48 - article #36
- Lori C. Beerman, L. Clifton Johnson, Morgan Fouesneau, Julianne J. Dalcanton, Daniel R. Weisz, Anil C. Seth, Ben F. Williams, Eric F. Bell, Luciana C. Bianchi, Nelson Caldwell, Andrew E. Dolphin, Dimitrios A. Gouliermis, Jason S. Kalirai, SÃƒÂ¸ren S. Larsen, Jason L. Melbourne, Hans-Walter Rix, and Evan D. Skillman
- The Astrophysical Journal - Volume: 760, Issue: 2
- Abstract References Full text PDF (3.58 MB) View as HTML
The Metallicity Profile of M31 from Spectroscopy of Hundreds of H II Regions and PNe
- Virtual Journal - Volume 10, Issue 42 - article #36
- Nathan E. Sanders, Nelson Caldwell, Jonathan McDowell, and Paul Harding
- The Astrophysical Journal - Volume: 758, Issue: 2
- Abstract References Full text PDF (1.65 MB) HTML with Enhancements
The metallicity profile of M31 from spectroscopy of hundreds of HII regions and PNe
- Virtual Journal - Volume 10, Issue 37 - article #11
- Nathan Sanders, Nelson Caldwell, Jonathan McDowell (CfA), Paul Harding (Case)
- arXiv.org - Astrophysics - Volume: 2012, Issue: 14 Sep
- arXiv:1209.2251 [pdf, ps, other]
PHAT Stellar Cluster Survey. I. Year 1 Catalog and Integrated Photometry
- Virtual Journal - Volume 10, Issue 23 - article #34
- L. Clifton Johnson, Anil C. Seth, Julianne J. Dalcanton, Nelson Caldwell, Morgan Fouesneau, Dimitrios A. Gouliermis, Paul W. Hodge, SÃƒÂ¸ren S. Larsen, Knut A. G. Olsen, Izaskun San Roman, Ata Sarajedini, Daniel R. Weisz, Benjamin F. Williams, Lori C. Beerman, Luciana Bianchi, Andrew E. Dolphin, LÃƒÂ©o Girardi, Puragra Guhathakurta, Jason Kalirai, Dustin Lang, Antonela Monachesi, Sanjay Nanda, Hans-Walter Rix, and Evan D. Skillman
- The Astrophysical Journal - Volume: 752, Issue: 2
- Abstract References Full text PDF (3.73 MB) HTML with Enhancements
Star Clusters in M31. IV. A Comparative Analysis of Absorption Line Indices in Old M31 and Milky Way Clusters
- Virtual Journal - Volume 10, Issue 4 - article #16
- Ricardo P. Schiavon, Nelson Caldwell, Heather Morrison, Paul Harding, StÃƒÂ©phane Courteau, Lauren A. MacArthur and Genevieve J. Graves
- Astronomical Journal - Volume: 143, Issue: 1
- doi:10.1088/0004-6256/143/1/14 Tag this article
Star Clusters in M 31. IV. A Comparative Analysis of Absorption Line Indices in Old M 31 and Milky Way Clusters
- Virtual Journal - Volume 9, Issue 50 - article #12
- Ricardo P. Schiavon, Nelson Caldwell, Heather Morrison, Paul Harding, Stephane Courteau, Lauren A. MacArthur, Genevieve J. Graves
- arXiv.org - Astrophysics - Volume: 2011, Issue: 16 Dec
- arXiv:1112.2737 [pdf, ps, other]
Star Clusters in M31: II. Old Cluster Metallicities and Ages from Hectospec Data
- Virtual Journal - Volume 9, Issue 3 - article #12
- Nelson Caldwell (CfA), Ricardo Schiavon (Gemini), Heather Morrison (Case), James A. Rose (UNC), Paul Harding (Case)
- arXiv.org - Astrophysics - Volume: 2011, Issue: 21 Jan
- arXiv:1101.3779 [pdf, ps, other]
CfA3: 185 Type Ia Supernova Light Curves from the CfA
- Virtual Journal - Volume 7, Issue 28 - article #23
- Malcolm Hicken, Peter Challis, Saurabh Jha, Robert P. Kirshner, Tom Matheson, Maryam Modjaz, Armin Rest, W. Michael Wood-Vasey, Gaspar Bakos, Elizabeth J. Barton, Perry Berlind, Ann Bragg, Cesar Briceño, Warren R. Brown, Nelson Caldwell, Mike Calkins, Richard Cho, Larry Ciupik, Maria Contreras, Kristi-Concannon Dendy, Anil Dosaj, Nick Durham, Kris Eriksen, Gil Esquerdo, Mark Everett, Emilio Falco, Jose Fernandez, Alejandro Gaba, Peter Garnavich, Genevieve Graves, Paul Green, Ted Groner, Carl Hergenrother, Matthew J. Holman, Vit Hradecky, John Huchra, Bob Hutchison, Diab Jerius, Andres Jordan, Roy Kilgard, Miriam Krauss, Kevin Luhman, Lucas Macri, Daniel Marrone, Jonathan McDowell, Daniel McIntosh, Brian McNamara, Tom Megeath, Barbara Mochejska, Diego Munoz, James Muzerolle, Orlando Naranjo, Gautham Narayan, Michael Pahre, Wayne Peters, Dawn Peterson, Ken Rines, Ben Ripman, Anna Roussanova, Rudolph Schild, Aurora Sicilia-Aguilar, Jennifer Sokoloski, Kyle Smalley, Andy Smith, Tim Spahr, K. Z. Stanek, Pauline Barmby, Stéphane Blondin, Christopher W. Stubbs, Andrew Szentgyorgyi, Manuel A. P. Torres, Amili Vaz, Alexey Vikhlinin, Zhong Wang, Mike Westover, Deborah Woods, and Ping Zhao
- The Astrophysical Journal - Volume: 700, Issue: 1
- Abstract | References
Hectospec, the MMT's 300 Optical Fiber-Fed Spectrograph
- Virtual Journal - Volume 3, Issue 34 - article #8
- Daniel Fabricant, Robert Fata, John Roll, Edward Hertz, Nelson Caldwell, Thomas Gauron, John Geary, Brian McLeod, Andrew Szentgyorgyi, et al
- ArXiv - Astrophysics – August 2005
- astro-ph/0508554 [ abs , ps , pdf , other ]
Radial Age and Metal Abundance Gradients in the Stellar Content of M32
- Virtual Journal - Volume 2, Issue 44 - article #1
- James A. Rose, Nobuo Arimoto, Nelson Caldwell, Ricardo P. Schiavon, Alexandre Vazdekis, Yoshihiko Yamada
- arXiv - Astrophysics – November 2004
- astro-ph/0411118 [ abs , ps , pdf , other ]

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