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We have investigated how the K-band magnitude of the red clump depends on age and metallicity, using 2MASS infrared data for a sample of 24 open clusters with known distances. We show that a constant value of is a reasonable assumption to use in distance determinations for clusters with metallicity between -0.5 and +0.4 dex and age between 108.5 and 109.9 years.
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Helshoecht et al. (2006) studied this question.
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