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Prog. Theor. Phys. Vol. 39 No. 3 (1968) pp. 619-634

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Evolution of Carbon Stars. I

— Gravitational Contraction and Onset of Carbon Burning —

Tadayuki Murai, Daiichiro Sugimoto,* Reiun Hōshi and Chushiro Hayashi

Department of Physics, Kyoto University, Kyoto
*Department of Physics, Nagoya University, Nagoya

(Received November 27, 1967)

Abstract:

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 les 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.


URL : http://ptp.ipap.jp/link?PTP/39/619/
DOI : 10.1143/PTP.39.619

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 39 No. 4 (1968) pp. 957-984 :
    Thermal Instability in a Nuclear-Burning Shell of Stars
    Reiun Hōshi
  2. Progress of Theoretical Physics Vol. 39 No. 6 (1968) pp. 1432-1447 :
    Evolution of Carbon Stars. II
    Daiichiro Sugimoto, Yoshiaki Yamamoto, Reiun Hōshi and Chushiro Hayashi
  3. Progress of Theoretical Physics Vol. 43 No. 2 (1970) pp. 319-333 :
    Evolution of Iron Stars
    Kiyoshi Nakazawa, Tadayuki Murai, Reiun Hōshi and Chushiro Hayashi
  4. Progress of Theoretical Physics Vol. 44 No. 2 (1970) pp. 375-388 :
    Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. I
    Daiichiro Sugimoto
  5. Progress of Theoretical Physics Vol. 44 No. 3 (1970) pp. 599-616 :
    Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. II
    Daiichiro Sugimoto
  6. Progress of Theoretical Physics Vol. 45 No. 3 (1971) pp. 761-775 :
    Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. III
    Daiichiro Sugimoto
  7. Progress of Theoretical Physics Vol. 46 No. 6 (1971) pp. 1713-1737 :
    Stellar Evolution toward Pre-Supernova Stage. I
    Satoru Ikeuchi, Kiyoshi Nakazawa, Tadayuki Murai, Reiun Hōshi and Chushiro Hayashi
  8. Progress of Theoretical Physics Vol. 48 No. 6 (1972) pp. 1870-1884 :
    Stellar Evolution toward Pre-Supernova Stage. II
    Satoru Ikeuchi, Kiyoshi Nakazawa, Tadayuki Murai, Reiun Hōshi and Chushiro Hayashi
  9. Progress of Theoretical Physics Supplement No.70 (1981) pp. 115-131 :
    Stable Numerical Method in Computation of Stellar Evolution
    Daiichiro Sugimoto, Ken'ichi Nomoto and Yoshiharu Eriguchi

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