Influence of Metallicity on Distance Indicators in the Near Universe: the Red Clump

Details Influence of Metallicity on Distance Indicators in the Near Universe: the Red Clump Influence of Metallicity on Distance Indicators in the Near Universe: the Red Clump

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..349..363v&link_type=abstract

Astrophysics of Variable Stars, Pecs, Hungary, 5-10 September 2005, Sterken, C. and Aerts, C. (eds). ASP Conference Series, Vol.

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Recently the red clump of clusters has come under consideration as a distance indicator. We have investigated how the K -band magnitude of the red clump [MK(RC)] depends on age and metallicity, using 2MASS infrared data for a sample of 31 open clusters. Through such a statistical analysis the MK(RC) of a cluster can be predicted. In combination with the apparent magnitude, one can then calculate the distance. We show that a constant value of MK(RC)=-1.57 ± 0.07 is a reasonable assumption for clusters with a metallicity between -0.5 and +0.2 dex and an age between 108.5 and 109.9 years.

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