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Astron. Astrophys. 325, 523-528 (1997)

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The G dwarf metallicity distribution and the problem of stellar lifetimes lower than the disk age

H.J. Rocha-Pinto and W.J. Maciel

Instituto Astronômico e Geofísico, Universidade de São Paulo, Av. Miguel Stefano 4200, CEP 04301-904, São Paulo, Brazil

Received 5 June 1996 / Accepted 28 March 1997

Abstract

We examine the possibility of the inclusion of objects having lifetimes lower than the disk age in the database of recent determinations of the G dwarf metallicity distribution for the solar neighbourhood. As a preliminary step, stars with lifetimes potentially lower than the disk age are identified by means of a relation between [FORMULA], or mass, and [Fe/H], from evolutionary models of stars at the zero-age main sequence. We apply these results to the G dwarf samples of Rocha-Pinto and Maciel (1996) and Wyse and Gilmore (1995). We show that the majority of G dwarfs in these samples can be regarded as long-lived objects for chemical evolution purposes, provided the disk age is greater than 12 Gyr. We also find that the G dwarf problem is not an effect of the metallicity dependence of the stellar lifetimes.

Key words: stars: abundances – Galaxy: abundances – Galaxy: evolution – solar neighbourhood

Send offprint requests to: H. J. Rocha-Pinto

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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