Helium Capturing Reactions in Stars
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概要
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The generation of ^<12>C, ^<16>O and ^<20>Ne by successive α-capturing processes in the helium core of stars is calculated under the condition at temperature〜10^8°K. The rates of forming ^<12>C and ^<20>Ne are found to be much larger than the previous calculations by Salpeter, Opik and Hoyle, due to the resonance levels recently discovered. The production rates of ^<24>Mg to ^<40>Ca are also ostimated. The formation of these nuclei is found to be negligible at temperatures below 4×10^8°K. The luminosity of such stars of globular clusters belonging to the horizontal branch in the H-R diagram that are supposed to be burning helium is accounted for in terms of the above thermonuclear reactions at the central temperature of(1.40±0.10)×10^8°K and the density of about 10^3g cm^<-3>. The lifetime of a star in this evolutionary stage is estimated roughly as 10^7 years. In this course of evolution ^<20>Ne is formed more abundant than others, in disagreement with the average cosmic abundances of ^<12>C, ^<16>O and ^20Ne. The modification of the abundances after this stage is suggested as necessary.
- 理論物理学刊行会の論文
著者
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Hayakawa Satio
Research Institute For Fundamental Physics Kyoto University
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Hayashi Chushiro
Department Of Nuclear Science Kyoto University
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Kikuchi Ken
Department Of Infection Control Science Faculty Of Medicine Juntendo University
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Imoto Mitsuo
Department Of Physics Kyoto University
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Imoto Mitsuo
Department Of Physics And Atomic Energy Research Institute College Of Science And Engineering Nihon
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Kikuchi Ken
Department Of Physics Osaka University:now At Institute For Nuclear Study Tokyo University
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Hayakawa Satio
Research Information Center Institute Of Plasma Physics Nagoya University
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IMOTO Mitsuo
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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KIKUCHI Ken
Department of Physics, Osaka University:Now at Institute for Nuclear Study, Tokyo University
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