Penetration of Convective Envelope into Stellar Core and Existence of Neutrino Loss

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概要

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• Evolution of Stars of masses 60M⦿,20M⦿ and 12M⦿ is computed mainly for a limiting case where neutrino loss due to the universal Fermi interaction is completely neglected. Convective envelope penetrates deeply into the highly evolved core, but the depth of penetration is found to depend on the stellar mass and the efficiency of convective energy transport. When the mixing proceeds quickly, the core mass is reduced finally below the Chandrasekhar limit and electrons become degenerate. When the mixing is relatively slow, on the other hand, decomposition of iron takes place in the core. When the degenerate core is formed, hydrogen is depleted uniformly in the envelope and the lifetime of this phase is much longer than one in the helium-burning phase. Moreover, in the bulk of that lifetime, the star remains to be a red supergiant, which is a peculiar star in its chemical composition. Thus both observed number ratio of blue to red supergiants and relative paucity of peculiar red supergiants support the existence of the neutrino loss, under the condition that the mixing length of convection is not appreciably smaller than unit scale height of pressure in the convective envelope. When the neutrino loss is included, on the other hand, only a star as massive as 60M⦿ may become a peculiar star as a result of the deep convective mixing, while the star of mass smaller than 30M⦿ does not. Discussion concerning an origin of highly luminous peculiar stars is also given.

• 理論物理学刊行会の論文
• 1974-08-25

著者

• Nomoto Ken'ichi

  Department Of Earth Science And Astronomy College Of General Education University Of Tokyo

• NOMOTO Ken'ichi

  Department of Earth Science and Astronomy, College of General Education, University of Tokyo

関連論文

• Penetration of Convective Envelope into Stellar Core and Existence of Neutrino Loss

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