Metallicity-dependent stellar ages and the G dwarf problem

Details Metallicity-dependent stellar ages and the G dwarf problem Metallicity-dependent stellar ages and the G dwarf problem

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..644b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 10, 1990, p. 644-648.

Astronomy and Astrophysics

Astrophysics

24

Chemical Evolution, Dwarf Stars, G Stars, Metallicity, Stellar Evolution, Abundance, Galactic Evolution, Helium, Main Sequence Stars, Star Distribution

Scientific paper

This paper reports on a study of the distribution of low-metallicity stars in the Galactic disk. This study makes use of model calculations which include the effects of changing metal and helium abundances on stellar lifetimes. Since low-metallicity stars have shorter main-sequence lifetimes than their Population I counterparts, there are fewer metal-poor G dwarfs at the present time than expected from calculations using lifetimes for stars with a solar composition. Inclusion of these metal-dependent lifetimes is shown to somewhat alleviate the G dwarf problem.

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