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Prog. Theor. Phys. Vol. 46 No. 6 (1971) pp. 1713-1737

Stellar Evolution toward Pre-Supernova Stage. I

— Carbon and Oxygen Stars of 5M_⊙, 10M_⊙ and 30M_⊙ —

Satoru Ikeuchi, Kiyoshi Nakazawa, Tadayuki Murai,^* Reiun Hōshi^** and Chushiro Hayashi

Department of Physics, Kyoto University, Kyoto
^*Department of Physics, Nagoya University, Nagoya
^**Department of Physics, Rikkyo University, Tokyo

(Received June 16, 1971)

Abstract:

The evolution of carbon-oxygen stars of 5M_⊙, 10M_⊙ and 30M_⊙ is computed from a pre-carbon-burning contraction stage to a pre-supernova stage through the phases of central burning of C, Ne, O, Mg, Si and Ni. These stars are regarded as representing the cross inside the helium shell-source of ordinary evolved stars. The computation is made for the two alternative cases, with and without neutrino production by electron-neutrino interaction.
It is found that in the case without neutrinos the stars contract nearly homologously with structure almost similar to the polytrope of index 3 and each central burning begins gently. Finally, the stars of 5M_⊙ and 10M_⊙ become unstable on account of the photo-disintegration of iron, while the star of 30M_⊙ becomes unstable in a central neon-burning phase by electron pair production.
In the case with neutrinos, energy loss through neutrinos accelerates the evolution and, at the same time, gives rise to a deviation from the homologous contraction. The stars tend to be centrally condensed with evolution and both O and Si begin to burn at the center as strong flashes. Finally, all of the stars become unstable after the formation of an iron core.

URL : http://ptp.ipap.jp/link?PTP/46/1713/
DOI : 10.1143/PTP.46.1713

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Citing Article(s) :

1. 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

2. Progress of Theoretical Physics Vol. 48 No. 6 (1972) pp. 1885-1898 :

   Time Variation of Metal Abundance in Galaxies

   Satoru Ikeuchi, Humitaka Sato, Tohru Sato and Hidenori Takeda

3. Progress of Theoretical Physics Vol. 52 No. 2 (1974) pp. 453-470 :

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

   Ken'ichi Nomoto

4. Progress of Theoretical Physics Vol. 54 No. 5 (1975) pp. 1325-1338 :

   Supernova Explosion and Neutral Currents of Weak Interaction

   Katsuhiko Sato

5. Progress of Theoretical Physics Vol. 61 No. 2 (1979) pp. 452-465 :

   Nuclear Synthetic Processes in Supernova Inner Shells

   Teruaki Ohnishi

6. Progress of Theoretical Physics Vol. 64 No. 3 (1980) pp. 820-830 :

   Helium Flash Model for X-Ray Bursts

   Reiun Hōshi

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