Early galactic evolution and the nature of the first stars

Details Early galactic evolution and the nature of the first stars Early galactic evolution and the nature of the first stars

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..593j&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, July 1985, p. 593-604. Research supported by the No

Astronomy and Astrophysics

Astronomy

10

Early Stars, Galactic Evolution, Metallic Stars, Protostars, Stellar Evolution, Abundance, Hydrogen, Metallicity, Populations, Stellar Mass, Stellar Models, Ultraviolet Radiation

Scientific paper

The observational data relating to the early evolution of the Galaxy are reviewed in order to assess the plausibility of a number of models that have been proposed for the first stars. On the basis of standard fragmentation models, it is argued that primordial stars were very similar to normal stars, but that in some circumstances the formation of low-mass primordial stars may be suppressed through the dissociation of molecular hydrogen by UV radiation. The existence of these conditions at the time of formation of the Galaxy could explain the absence of zero-metal stars. It is likely that primordial stars were neither highly peculiar nor very numerous, nor do they or their remnants make any substantial contribution to the Galaxy today.

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