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Title:
Galactic Globular and Open Clusters in the Sloan Digital Sky Survey. II. Test of Theoretical Stellar Isochrones
Authors:
An, Deokkeun; Pinsonneault, Marc H.; Masseron, Thomas; Delahaye, Franck; Johnson, Jennifer A.; Terndrup, Donald M.; Beers, Timothy C.; Ivans, Inese I.; Ivezić, Željko
Affiliation:
AA(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Current address: Infrared Processing and Analysis Center, California Institute of Technology, Mail Stop 100-22, Pasadena, CA 91125, USA; .; ), AB(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AC(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AD(Service d'Astrophysique, CEA/DSM/IRFU/SAp, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France ; Centre Lasers Intenses et Applications (CELIA), 351 Cours de la Libération, 33405 Talence Cedex, France ; LERMA, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France ), AE(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ), AF(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA ; Division of Astronomical Sciences, National Science Foundation, 4201 Wilson Boulevard, Arlington, VA 22230, USA ), AG(Department of Physics & Astrophysics, CSCE: Center for the Study of Cosmic Evolution, and JINA: Joint Institute for Nuclear Astrophysics, Michigan State University, E. Lansing, MI 48824, USA ), AH(The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA ; Princeton University Observatory, Peyton Hall, Princeton, NJ 08544, USA ), AI(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA )
Publication:
The Astrophysical Journal, Volume 700, Issue 1, pp. 523-544 (2009). (ApJ Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
globular clusters: individual: M3 M5 M13 M15 M71 M92, Hertzsprung-Russell (HR) diagram, open clusters and associations: individual: M67 NGC 6791, stars: evolution, surveys
DOI:
10.1088/0004-637X/700/1/523
Bibliographic Code:
2009ApJ...700..523A

Abstract

We perform an extensive test of theoretical stellar models for main-sequence (MS) stars in ugriz, using cluster fiducial sequences obtained in the previous paper of this series. We generate a set of isochrones using the Yale Rotating Evolutionary Code with updated input physics, and derive magnitudes and colors in ugriz from MARCS model atmospheres. These models match cluster MSs over a wide range of metallicity within the errors of the adopted cluster parameters. However, we find a large discrepancy of model colors at the lower MS (T eff lsim 4500 K) for clusters at and above solar metallicity. We also reach similar conclusions using the theoretical isochrones of Girardi et al. and Dotter et al., but our new models are generally in better agreement with the data. Using our theoretical isochrones, we also derive MS-fitting distances and turnoff ages for five key globular clusters, and demonstrate the ability to derive these quantities from photometric data in the Sloan Digital Sky Survey. In particular, we exploit multiple color indices (g - r, g - i, and g - z) in the parameter estimation, which allows us to evaluate internal systematic errors. Our distance estimates, with an error of σ(m-M) = 0.03-0.11 mag for individual clusters, are consistent with Hipparcos-based subdwarf-fitting distances derived in the Johnson-Cousins or Strömgren photometric systems.
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