Screened reaction rates and mean lifetimes for the production of helium in stars

Details Screened reaction rates and mean lifetimes for the production of helium in stars Screened reaction rates and mean lifetimes for the production of helium in stars

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.107..233k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 107, no. 2, Dec. 1984, p. 233-240. Research supported by the University Gr

Astronomy and Astrophysics

Astrophysics

1

Helium, Reaction Kinetics, Stellar Cores, Thermonuclear Reactions, Hydrostatics, Main Sequence Stars, Stellar Evolution

Scientific paper

Mean lifetimes and the effect of screening on thermonuclear reaction rates are studied for the following reactions: H-1(1)(P beta + nu)H-2(1) and He-3(2)(He-3 2H)He-4(2). During the construction stage of the core of a Main-sequence star, which forms in a very short time, the second reaction continues in and around the core but the first reaction takes place in the outer envelope. It is shown that when the core starts forming and departs from the hydrostatic equilibrium, the dimensionless parameter, Gamma, remains constant. The longevity of Main-sequence stars depends on the first reaction at densities 100 g/cu cm and 1000 g/cu cm. The second reaction at density 100 g/cu cm plays an important role in retaining a star in its Main-sequence stage for some million years. The results are presented in tables.

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