Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..569g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Mar. 1977, p. 569-576.
Astronomy and Astrophysics
Astronomy
11
Chemical Evolution, Galactic Evolution, Helium, Milky Way Galaxy, Stellar Envelopes, Enrichment, Hydrogen, Nuclear Fusion, Stellar Mass Ejection
Scientific paper
A source of helium (and possibly carbon) enrichment in the Galaxy is considered which involves the mixing of freshly synthesized helium and carbon into the envelopes of intermediate-mass double-shell-source stars following strong helium-shell flashes and the subsequent loss of the helium-enriched envelopes due to steady mass loss, dynamical instability, or supernova explosion. The stellar mass, envelope helium abundance, core mass, and mass lost as a star ascends the second giant branch are computed along with the mass and helium abundance of the matter ejected by the star and the final envelope composition. Enhancement of the envelope C-12 abundance by the same mechanism is also examined. Numerical results obtained for different mass-loss rates and core masses indicate that the mechanism considered can lead to a substantial increase in Galactic helium enrichment but not enough to yield the observed helium/heavy-element enrichment ratio of approximately 2.7.
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