The effects of binary evolution on the production of heavy elements in massive stars

Details The effects of binary evolution on the production of heavy elements in massive stars The effects of binary evolution on the production of heavy elements in massive stars

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81..228v&link_type=abstract

Astronomy and Astrophysics, vol. 81, no. 1-2, Jan. 1980, p. 228-234.

Astronomy and Astrophysics

Astrophysics

9

Binary Stars, Heavy Elements, Nuclear Fusion, Stellar Evolution, Helium, Roche Limit, Stellar Mass Accretion, Stellar Winds

Scientific paper

The production of helium and heavier elements is examined in massive (M > 10 Msun) close (period ≦500 d) binary systems. Mass loss by stellar wind during core hydrogen burning prior to Roche lobe overflow is included. During this phase most of the material lost by one or both components leaves the system and may enhance the helium content of the interstellar medium. Part of the mass in the Roche lobe overflow of either component may also leave the system and influence the composition of the interstellar medium. However, that mass which is accreted by the secondary may be further processed by CNO cycle reactions before being ejected in a supernova explosion. The remnant stars after Roche lobe overflow are burning helium in their cores and seem to correspond to Wolf-Rayet stars. Observations of WR stars indicate mass loss rates large enough to affect their evolution in that the final size of their carbon-oxygen cores is reduced. The net effect of including Roche lobe overflow and two phases of stellar wind mass loss in binary evolution is that the production of helium is greatly increased and the production of heavier elements is greatly decreased when compared to single star evolution. Yields integrated over initial mass and mass ratio are presented.

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