Physics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975conph..16...51b&link_type=abstract
Contemporary Physics, vol. 16, Jan. 1975, p. 51-68.
Physics
Angular Momentum, Energy Conservation, Hertzsprung-Russell Diagram, Stellar Evolution, Thermonuclear Reactions, Binary Stars, Degenerate Matter, Electron Gas, Energy Dissipation, Equations Of State, Gas Pressure, Giant Stars, Interstellar Gas, Main Sequence Stars, Thermonuclear Power Generation
Scientific paper
The theory of stellar evolution is reviewed in a simple fashion, with emphasis on topics for which some rethinking may be required. It is suggested that evolution of stars off the main sequence in the H-R diagram into the area occupied by the giants is caused, not by fuel exhaustion, but simply by instability following the ignition of thermonuclear energy release in the interior. The physics of a degenerate gas is discussed. It is pointed out that the equation of state remains the same as for a normal gas, but the pressure is exerted only by that fraction of the particles which occupy states within kT of the Fermi level. Degeneracy of the electron gas causes a large reduction of opacity, leading to an increased rate of loss of energy. The higher luminosity is first fed by gravitational potential energy released during a phase of rapid contraction. However, when the proton Fermi level reaches a certain threshold, thermonuclear processes take over.
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