Evolution of Carbon Stars. I : Gravitational Contraction and Onset of Carbon Burning
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概要
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The evolution of carbon-oxygen stars in a gravitational contraction phase is studied with an automatic computation method for the stellar masses 0.7M⦿, 1.0M⦿, 2.6M⦿ and 10M⦿. These stars are regarded as representing the carbon-oxygen cores which have been formed in evolved stars in helium-burning phase. To know the effect of neutrino loss on the evolution, computations are made for the two alternative cases, i. e. the cases with and without neutrino production. It is found that, if nuclear burning is neglected, the central temperature increases unlimitedly for the stars of 2.6M⦿ and 10M⦿, while it has an upper limit due to the onset of electron degeneracy for the stars of 0.7M⦿ and 1.0M⦿. The neutrino loss suppresses the increase of the central temperature and reduces the time-scale of contraction. The onset stage of carbon burning and the subsequent transition to the zero-age carbon main-sequence stage are computed. The minimum stellar mass for this onset is found to be 0.75M⦿ for the case without neutrinos and 1.06M⦿ for the case with neutrinos.
- 理論物理学刊行会の論文
- 1968-03-25
著者
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Hayashi Chushiro
Department Of Nuclear Science Kyoto University
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Hoshi Reiun
Department Of Physics Kyoto University
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Sugimoto Daiichiro
Department Of Earth Science And Astronomy College Of General Education University Of Tokyo
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Murai Tadayuki
Department Of Physics Kyoto University
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HAYASHI Chushiro
Department of Nuclear Science : Research Institute for Fundamental Physics Kyoto University : National Aeronautics and Space Administration
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