Stellar evolution with turbulent diffusion mixing. VII - Application to the determination of primordial He-3 abundance

Details Stellar evolution with turbulent diffusion mixing. VII - Application to the determination of primordial He-3 abundance Stellar evolution with turbulent diffusion mixing. VII - Application to the determination of primordial He-3 abundance

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172....1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 1-14. Research supported by the University of Cali

Astronomy and Astrophysics

Astrophysics

8

Abundance, Chemical Evolution, Helium Ions, Stellar Evolution, Turbulent Diffusion, Turbulent Mixing, Galactic Evolution, Main Sequence Stars, Milky Way Galaxy, Nuclear Fusion, Stellar Mass Ejection, Stellar Winds

Scientific paper

A new scenario of the chemical evolution of the Galaxy is presented here. It includes the presence of 3He factories in the Galaxy: (1) turbulent diffusion mixing increases the amount of 3He present in the outer layers of main sequence stars. When mass loss takes place, 3He-rich stellar winds carry a large amount of 3He in interstellar matter; (2) flare stars give another contribution to the enrichment of the Galaxy in 3He. Other effects have to be taken into account: trapping in binary stars, diffusion transport in the Galaxy, infall of matter from the halo. As a consequence of the existence 3He factories, the primordial abundance of 3He may be appreciably smaller than the present abundance, leading to a high value of the number ratio (baryons/photons). A brief discussion is given of the consistency with abundance data of other light elements.

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