The formation of red giants

Details The formation of red giants The formation of red giants

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...156..391b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 156, no. 1-2, Feb. 1986, p. 391, 392.

Astronomy and Astrophysics

Astrophysics

4

Dwarf Stars, Polytropic Processes, Red Giant Stars, Stellar Evolution, Molecular Weight, Stellar Cores, Stellar Envelopes, Stellar Gravitation

Scientific paper

The author considers the processes that may explain why dwarf stars become red giants after they complete central hydrogen burning. It seems clear that it is the development of a molecular weight gradient and an increased gravitational field at the central core boundary that conspire to transform a star into a red giant. The author indicates here that both of these effects can have an explanation in terms of simple polytropes; nuclear evolution and the change to shell hydrogen burning both act in the sense of increasing the star averaged polytropic index >n< towards its maximum value of five.

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