K-band magnitude of the red clump as a distance indicator*
Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium e-mail: email@example.com
Accepted: 21 September 2006
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.
Key words: open clusters and associations: general / stars: horizontal-branch / stars: distances
© ESO, 2007