HIPPARCOS subdwarfs and globular cluster ages: the distance and age of M 92

Details HIPPARCOS subdwarfs and globular cluster ages: the distance and age of M 92 HIPPARCOS subdwarfs and globular cluster ages: the distance and age of M 92

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329...87p&link_type=abstract

Astronomy and Astrophysics, v.329, p.87-100 (1998)

Astronomy and Astrophysics

Astrophysics

127

Globular Clusters: M 92, Stars: Kinematics, Hr-Diagram, Stars: Abundances, Galaxy: Kinematics And Dynamics

Scientific paper

A new determination of the distance and age of the old globular cluster M 92 (NGC 6341) is obtained from a consideration of a set of more than 500 subdwarf candidates with Hipparcos parallaxes. Precise [Fe/H] values are derived for most stars using the equivalent width of the Coravel cross-correlation function. We examine at some length the biases affecting the determination of the mean luminosity of a set of subdwarfs selected by metallicity and sigma_ pi /pi

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