Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222...69s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 69-81. Research supported by the Instituto Nacion
Astronomy and Astrophysics
Astrophysics
156
Astronomical Photometry, Galactic Evolution, Milky Way Galaxy, Stellar Motions, Ubv Spectra, Astronomical Catalogs, Halos, Interstellar Extinction, Metallic Stars
Scientific paper
The interstellar color excesses, E(b-y) and the metallicities, Fe/H abundance ratio, are determined for the 711 high-velocity and metal-poor stars in the catalog of ubvy-beta photometry compiled by Schuster and Nissen (1988). It is found that 220 of these are halo stars and that 15 percent of these halo stars have colors that are significantly affected by interstellar reddening. A minimum age of 18-20 Gyr is determined for the halo stars. The results suggest that a pressure-supported slow uniform collapse controlled the formation and evolution of the Galaxy.
Nissen Poul Erik
Schuster William J.
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