Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978azh....55..472m&link_type=abstract
Astronomicheskii Zhurnal, vol. 55, May-June 1978, p. 472-481. In Russian.
Astronomy and Astrophysics
Astronomy
3
Galactic Evolution, Late Stars, Milky Way Galaxy, Orbital Elements, Angular Momentum, Eccentric Orbits, Kinematics, Stellar Evolution, Subdwarf Stars
Scientific paper
The eccentricity and angular-momentum distributions of halo stars and old disk stars (e.g., subdwarfs, Miras, RR Lyrae variables) are investigated. It is found that the distributions contain gaps which separate the halo from the disk and divide the halo population into three groups. From the viewpoint of star formation during collapse in early stages of Galactic evolution, the gaps are taken to indicate that there were long periods in those early stages when star formation was suppressed in the Galaxy. Based on a comparison of the investigated distributions with those of heavy elements among Galactic populations, it is concluded that the suppression of star formation was associated with phases when the Galaxy was enriched in metals; i.e., star formation was probably suppressed during enrichment phases.
Marsakov V. A.
Suchkov Anatoly A.
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