Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..243e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 243-248.
Astronomy and Astrophysics
Astrophysics
17
Blue Stars, Stellar Rotation, Supergiant Stars, Supernova 1987A, Angular Velocity, Mass Distribution, Stellar Magnetic Fields, Stellar Mass Ejection, Stellar Winds
Scientific paper
Attention is given to two rotational effects of the progenitor of SN 1987A, namely, mass-shedding from the equator and an aspherical mass distribution in a stellar wind due to the direction-dependent mass loss. It is found that, if the rotational velocity of the progenitor at the main sequence exceeds 270 km/s, mass-shedding can occur at the blue supergiant stage. This is due to the decreasing amount of inertia along the evolution with increasing mass concentration toward the center. The observed abundances and the expansion velocity of the ring provide rather severe constraints on the time of mass-shedding, which suggests that the mass-shedding scenario is less likely the case. The stellar wind combined with the rotation forms an aspherical mass distribution in the distant region from the star. The nonsphericity can be 10-20 percent depending on the ratio of the rotational energy to the gravitational energy.
Eriguchi Yoshiharu
Hashimoto Makoto
Nomoto Ken
Yamaoka Hitoshi
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