Evolution and nucleosynthesis in massive stars with mass loss - The yields in helium and heavy elements and constraints on the past star formation rate

Details Evolution and nucleosynthesis in massive stars with mass loss - The yields in helium and heavy elements and constraints on the past star formation rate Evolution and nucleosynthesis in massive stars with mass loss - The yields in helium and heavy elements and constraints on the past star formation rate

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..385m&link_type=abstract

Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. 385-396. Research supported by the Swiss National Science Foundatio

Astronomy and Astrophysics

Astrophysics

78

Heavy Elements, Helium, Nuclear Fusion, Star Formation, Star Formation Rate, Stellar Mass Ejection, Stellar Structure, Grids, Stellar Envelopes, Stellar Models, Supermassive Stars

Scientific paper

Three grids of models of stellar evolution in the range 9-170 solar masses were computed from the main sequence to the end of the carbon-burning phase. One grid concerns evolution at constant mass, the other two include mass loss according to observational rates. The synthesis of helium and heavy elements is considered. Two physical effects in stellar evolution tend to limit the effects of mass loss on helium and metal synthesis: (1) in mass-losing models, the growth of the He plus C plus O core during the He burning phase is greater than that for constant mass evolution, and this reduces previous differences in the core sizes; and (2) there is some compensation between the new matter ejected in the wind of mass-losing models and the matter mixed in the envelope and ejected at supernova explosion in constant mass evolution. In addition, it is shown that the rate of metal synthesis does not require a high ratio of the average past star formation rate to the present rate.

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