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Astron. Astrophys. 329, 943-950 (1998)


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Revised ages for stars in the solar neighbourhood*

Y.K. Ng 1 and G. Bertelli 2, 3

1 Padova Astronomical Observatory, Vicolo dell'Osservatorio 5, I-35122 Padua, Italy (Yuen@pd.astro.it)
2 Department of Astronomy, Vicolo dell'Osservatorio 5, I-35122 Padua, Italy (Bertelli@pd.astro.it)
3 National Council of Research, CNR - GNA, Rome, Italy

Received 23 January 1997 / Accepted 1 July 1997

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 ([FORMULA]  Gyr), while they are slightly lower for [FORMULA]  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 [FORMULA] 0.07 dex/Gyr.

Key words: methods: data analysis – stars: statistics; HR-diagram – Galaxy: solar neighbourhood

* Tables 3-8 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or WWW at URL http://cdsweb.u-strasbg.fr/Abstract.html

© European Southern Observatory (ESO) 1998

Online publication: December 16, 1997
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