Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..415i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 415-422.
Astronomy and Astrophysics
Astrophysics
7
Explosions, Hydrodynamics, Shock Wave Propagation, Stellar Rotation, Supernova 1987A, Asymmetry, Blue Stars, Radial Flow, Supergiant Stars
Scientific paper
Asymmetric explosion of SN 1987 A is investigated by a two-dimensional axisymmetric hydrodynamical code. Two possibilities for the seed of the asymmetry, jet-like explosion of the Fe core and shock propagation in a star distorted by its own rotation, are investigated. For the latter studies, we calculated the density structure of the presupernova star in rotational equilibrium by using SCF method, which makes our calculation more realistic than previous works. The main results are as follows. (1) Jet-like explosion is more likely than distortion of the presupernova star since it is almost impossible to deform a blue supergiant to the degree necessary for the asymmetric explosion. (2) The degree of asymmetry observed by speckle can be explained by the asymmetry in the element distribution, not by the asymmetry in the density structure of ejecta. (3) There exist mainly two phases in the expansion: the blastwave phase when the radial flow dominates the expansion, and the subsequent expansion phase when the density profile becomes spherical by the effect of theta flow.
Ishikawa Sumio
Kiguchi Manabu
Sato Kachishige
Yamada Shoichi
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