The calculation of a collapse of iron-oxygen stellar core in one-group energy approximation

Details The calculation of a collapse of iron-oxygen stellar core in one-group energy approximation The calculation of a collapse of iron-oxygen stellar core in one-group energy approximation

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..703a&link_type=abstract

Astronomy Letters, Volume 24, Issue 6, November 1998, pp.703-715; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 813

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Results of the calculation of a gravitational collapse of the iron-oxygen core of a star with mass 2M_solar by the new method proposed by one of the authors (Aksenov 1998a) are presented. This method incorporates the integration of hydrodynamic equations of matter, equations of -processes and thermonuclear reactions kinetics, and the solution of transfer equations for different kinds of neutrino with allowance for the dependence of radiation intensities on the direction of motion and energy of particles. The calculations are carried out in the one-group energy approximation and compared to those obtained earlier by Nadyozhin (1978). The main result of this work is the presence of a narrow peak with a characteristic width of ~10 ms in the light curve, which enables one to determine the upper bound on the rest mass of electron neutrino at a level of ~2 eV in the case of detection of neutrinos produced by the gravitational collapse in our Galaxy. The major fraction (~ 90%) of the gravitational binding energy is radiated in the succeeding ~20 s, i.e., over a fairly long time interval, as in Nadyozhin calculations (1978). We also calculated the collapse of stellar core with rapid initial solid-body rotation using the spherically symmetric approximation with averaging of the centrifugal force over the solid angle. Parameters of a rapidly and differentially rotating finite-sized neutron star point to the possibility of the stellar core to fragment in the course of the collapse.

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