Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54.1232m&link_type=abstract
Astronomicheskii Zhurnal, vol. 54, Nov.-Dec. 1977, p. 1232-1240. In Russian.
Astronomy and Astrophysics
Astronomy
13
Abundance, Galactic Evolution, Metallic Stars, Stellar Evolution, Globular Clusters, Milky Way Galaxy
Scientific paper
Metallicity distributions of halo and disk objects are studied, including those of main-sequence dwarfs and subdwarfs, M dwarfs, red giants, globular clusters, and RR Lyrae stars. The metal-abundance distributions of the stars and globular clusters are found to contain two gaps which divide the entire population of the Galaxy into three groups: a disk population and two types of halo population. The analogous lack of a continuous transition from kinematically old to kinematically young populations is also noted. It is concluded that: (1) metal enrichment of the Galaxy has occurred in discrete bursts rather than as a continuous process; (2) these bursts occurred during the collapse of the early Galaxy; (3) star formation was inhibited during the enrichment phases; and (4) enrichment practically ceased during intervening periods of star formation.
Marsakov V. A.
Suchkov Anatoly A.
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