Physics
Scientific paper
Aug 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963pthph..30..170o&link_type=abstract
Progress of Theoretical Physics, Vol. 30, No. 2, pp. 170-190
Physics
9
Scientific paper
Various nuclear reactions which would take place after the collapse of stellar core caused by Fe to He reaction at the iron core of aged massive stars are investigated and it is shown that an enormous amount of energy from rapid nuclear reactions among light elements such as oxygen and carbon gives rise to the generation of shock wave. The rate of energy generation and the total amount of energy released are calculated, assuming a sort of burning front advancing outwards in the star, to be about 10^{47} erg/sec and 10^{51} ˜ 10^{52} erg, respectively. The behavior of propagation of the shock wave is calculated by the use of the method of Ôno et al. with a model of giant stars with mass of 15.6 M_{odot} presented by Hayashi et al. Escape of radiation from the shock front is also considered when the shock approaches the stellar surface. Then it is shown that the maximum luminosity is about 3 × 10^{43} erg/sec, the maximum temperature about 10^5{}^{circ}K, the width of peak of light curve at the maximum luminosity 10^{5 ˜ 6} sec and the expanding velocity of matter (0.5 ˜ 1) × 10^8 cm/sec. The fact that these values are fairly consistent with the observational data of Type II supernova appears to show that the massive stars may possibly become Type II supernovae at the last phase of giant stage.
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