Evolution of a population III star of low mass

Details Evolution of a population III star of low mass Evolution of a population III star of low mass

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118..262g&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 2, Feb. 1983, p. 262-266.

Astronomy and Astrophysics

Astrophysics

13

Astrophysics, Main Sequence Stars, Stellar Evolution, Abundance, Carbon, Entropy, Hydrogen, Stellar Mass, Stellar Models

Scientific paper

An evolutionary track for a metal-free star of low mass with parameters (M/M_sun;, X, Z)=(0.90, 0.80, 0.00) has been constructed from the main sequence to the base of the giant branch. It has been found that, although the evolutionary path of the star near the main sequence is similar to that of a star of very low metallicity, its internal structure is not. The zero-metallicity star failed to exhaust its central hydrogen. It maintained a trace amount of hydrogen in the core, through turnoff, up to the base of the giant branch where enough carbon was produced at the center by the triple-alpha reaction to start CN-burning. A convective core was formed which grew so rapidly that the calculations had to be terminated. Possible subsequent evolutionary outcomes are discussed, all of which suggest that compared to low-metallicity stars, the time spent in the giant phase will be sharply reduced.

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