Fiducial stellar population sequences for the u′g′r′i′z′ system

被引：52

作者：

Clem, James L. ^{[1
]}

VandenBerg, Don A. ^{[1
]}

Stetson, Peter B. ^{[2
]}

机构：

[1] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 3P6, Canada

[2] Natl Res Council Canada, Herzberg Inst Astrophys, Dominion Astrophys Observ, Victoria, BC V9E 2E7, Canada

来源：

ASTRONOMICAL JOURNAL | 2008年 / 135卷 / 02期

关键词：

globular clusters : general; globular clusters : individual (M 92; M; 13; 3; M 71) Hertzsprung-Russell diagram; open clusters and associations : individual (NGC 6791);

D O I：

10.1088/0004-6256/135/2/682

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe an extensive observational project that has obtained high-quality and homogeneous photometry for a number of different Galactic star clusters ( including M92, M13, M3, M71, and NGC 6791) spanning a wide range in metallicity (-2.3 less than or similar to [ Fe/ H] less than or similar to + 0.4), as observed in the u ' g ' r ' i ' z ' passbands with the MegaCam wide-field imager on the Canada - France - Hawaii Telescope. By employing these purest of stellar populations, fiducial sequences have been defined from color - magnitude diagrams that extend from the tip of the red-giant branch down to approximately four magnitudes below the turnoff: these sequences have been accurately calibrated to the standard u ' g ' r ' i ' z ' system via a set of secondary photometric standards located within these same clusters. Consequently, they can serve as a valuable set of empirical fiducials for the interpretation of stellar populations data in the u ' g ' r ' i ' z ' system.

引用

页码：682 / 692

页数：11

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