The transformation of a main sequence star into a red-giant star in the core-and-shell model

Details The transformation of a main sequence star into a red-giant star in the core-and-shell model The transformation of a main sequence star into a red-giant star in the core-and-shell model

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000amjph..68..421h&link_type=abstract

American Journal of Physics, Volume 68, Issue 5, pp. 421-423 (2000).

Physics

Educational Aids, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Giant And Subgiant Stars

Scientific paper

As a star evolves from the hydrogen to the helium burning stage, i.e., from the sun-like state to the state of a red-giant star, the temperature of its core increases whereas the volume decreases. At the same time the temperature of its shell decreases while the volume of the shell increases. This behavior of the core and of the shell is explained qualitatively by a simple model. The star is considered to be composed of two homogeneous subsystems: the active core where the heat production takes place and the shell which plays the part of a thermal insulator. Each of these subsystems is stabilized by a feedback mechanism which works thanks to the negative heat capacity of both systems.

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