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Distance estimates to five open clusters based on 2mass data of red clump giants

Published online by Cambridge University Press:  26 February 2013

Li Chen  and
Xinhua Gao
Li Chen
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China email: [email protected]
Xinhua Gao
Affiliation:
School of Information Science and Engineering, Changzhou University, Changzhou 213164, China email: [email protected]
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Abstract

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Red clump (RC) giants are excellent standard candles in the Milky Way and the Large Magellanic Cloud. The near-infrared K-band intrinsic luminosity of RC giants exhibits only a small variance and a weak dependence on chemical composition and age. In addition, RCs are often easily recognizable in the color–magnitude diagrams of open clusters, which renders them extremely useful distance indicators for some intermediate-age or old open clusters. Here we determine the distance moduli of five Galactic open clusters covering a range of metallicities and ages, based on RC giants in the cluster regions using 2mass photometric data. We compare our result with those from main-sequence fitting and also briefly discuss the advantages and disadvantages of RC-based cluster distance determination.

Keywords

open clusters and associations: individual (NGC 6791, NGC 2420, NGC 2682, NGC 2158, NGC 7789)distance scale
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S289: Advancing the Physics of Cosmic Distances , August 2012 , pp. 367 - 370
Copyright
Copyright © International Astronomical Union 2013

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