Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985fcph....9..317c&link_type=abstract
Fundamentals of Cosmic Physics (ISSN 0094-5846), vol. 9, Feb. 1985, p. 317-439.
Physics
14
Galactic Evolution, Red Giant Stars, Stellar Evolution, Stellar Physics, Blue Stars, Convection, Metallicity, Milky Way Galaxy, Nuclear Fusion, Star Clusters, Stellar Mass, Stellar Mass Ejection, Supernovae
Scientific paper
The progress made thus far in synthesizing a coherent, supportable evolutionary scenario for Population II (Pop II) stars is assessed, together with the directions of present research. Pop II stars are the red giants, the metal-poor objects in the galactic halo, and are up to 10 Gyr old, i.e., a large fraction of the age of the Universe. Attention is given to the problems posed by the presence of metal-rich stars in the halo. Mathematical models for thermonuclear reactions in stars and supernovae are considered, along with stellar convection, evolutionary theories, and the processes of H- and He-burning in Pop II stars. Observational data for RR Lyrae rich and poor stars are discussed, as are the characteristics of metal-poor stars during galactic evolution. It is noted that near-term space-based observations of stellar populations in other galaxies will greatly expand the existing data base on evolutionary patterns in galaxies, with the Galactic data base, being more developed, serving as a comparison case.
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