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A preliminary systematic search for red-clump stars in Galactic open clusters based on 2mass data

Published online by Cambridge University Press:  26 February 2013

Xi Zhang ,
Li Chen  and
Zhongmu Li
Xi Zhang
Affiliation:
Institute of Astronomy and the History of Science and Technology, Dali University, Dali 671003, China email: xizhang1266@gmail.com, zhongmu.li@gmail.com
Li Chen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China email: chenli@shao.ac.cn
Zhongmu Li
Affiliation:
Institute of Astronomy and the History of Science and Technology, Dali University, Dali 671003, China email: xizhang1266@gmail.com, zhongmu.li@gmail.com
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Abstract

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Red-clump (RC) giants are intermediate-age, core-helium-burning stars. The RC can be used as a standard candle. In particular, the small variance of the RC's K-band intrinsic luminosity and its weak dependence on chemical composition and age make it an extremely useful distance indicator. In this paper, we use 2mass data to search for RC stars in a sample of 60 Galactic open clusters with known reddening, ages, and distances, and obtain an average value for the RC's absolute Ks-band magnitude, MKs = −1.72 ± 0.17 mag.

Keywords

open clusters and associations: generaldistance scale
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 441 - 443
Copyright
Copyright © International Astronomical Union 2013

References

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