Very massive stars - Evolution with mass loss

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Nuclear Fusion, Stellar Composition, Stellar Evolution, Stellar Mass Ejection, Supermassive Stars, Helium, Hydrogen, Main Sequence Stars, Oxygen, Pre-Main Sequence Stars

Scientific paper

Attention is given to the nucleosynthesis and mass loss aspects of the H- and He-burning phase of metal-free, mass-losing, very massive stars (VMSs) in the 5000-10,000 solar mass range. By means of radiation-driven winds, such a star loses 20-40 percent of its mass in the form of He and about 1 percent in the forms of C and O. The results presently obtained indicate that VMSs cannot produce the cosmological He abundance without yielding an overproduction of heavier elements; in particular, their high oxygen yield makes them the best candidates for the production of an oxygen overabundance in old Population II stars.

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