Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..674c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 674-681.
Astronomy and Astrophysics
Astrophysics
189
Metallicity, Stellar Composition, Stellar Evolution, Stellar Motions, Velocity Distribution, Chemical Evolution, F Stars
Scientific paper
The age-velocity-dispersion relation for stars in the solar neighborhood is examined as an indicator of the dominant acceleration mechanism of the stars and the formation history of the local disk. Twarog's sample of F stars, for which ages and photometric distances can be determined, is combined with astrometric data to obtain tangential velocities of a set of stars with a large age range. The resulting age-velocity-dispersion relation rises fairly steeply for stars less than 6 Gyr old, thereafter becoming nearly constant with age. These data are consistent with a simple model in which no local disk is initially present, following which stars are born at a constant rate in time and heated by transient spiral waves. The corresponding age-metallicity relation complements this dynamical measure of the formation history of the disk. The use of new stellar models and a revised metallicity calibration leads to quantitative differences from previous work.
Carlberg Ray G.
Dawson Peter C.
Hsu Ted
VandenBerg Don. A.
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