Revised ages for the stars in the solar neighbourhood

Abstract

New ages are computed for the stars from the Edvardsson et al. (1993) data set. The revised values are systematically larger toward older ages (t>4 Gyr), while they are slightly lower for t<4 Gyr. A similar, but considerably smaller trend is present when the ages are computed with the distances based on Hipparcos parallaxes. The resulting age-metallicity relation has a small, but distinct slope of about 0.07 dex/Gyr

14 pages LaTeX with 8 tables, to be published in A&A Main Journal; removed two figures, replaced two others and adjusted part of the text after constructive comments from Drs. Edvardsson, Gustafsson, and Nissen