천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제37권2호
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- Pages.147.1-147.1
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- 2012
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- 1226-2692(pISSN)
Empirical Horizontal-Branch Loci of Galactic Globular Clusters in the Sloan Digital Sky Survey
- Yu, Hyein (Ewha Womans University) ;
- An, Deokkeun (Ewha Womans University) ;
- Chung, Chul (Yonsei University)
- 발행 : 2012.10.17
초록
We present empirical fiducial sequences for horizontal-branch (HB) stars in a set of bright Galactic globular clusters previously observed in SDSS (An et al. 2008). Mean loci of HB stars are derived on color-magnitude diagrams with multiple color indices (u - g, g - r, g - i, and g - z ) in order to identify foreground/background objects as well as cluster RR Lyrae variables. We compare our fiducial sequences to the model predictions from Yonsei-Yale isochrones and test the accuracy of the stellar evolution models.
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