Parameters of the classical type-IIP supernova SN 1999emстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Based on observations of SN 1999em, we determined the physical parameters of this supernova using hydrodynamic calculations including nonequilibrium radiative transfer. Taking the distance to SN 1999em estimated by the expanding photosphere method (EPM) to be D = 7.5 Mpc, we found the parameters of the presupernova: radius R = 450R \sun, mass M = 15M \sun, and explosion energy E = 7 \times 1050 erg. For the distance D = 12 Mpc determined from Cepheids, R, M, and E must be increased to the following values: R = 1000R \sun, M = 18M \sun, and E = 1051 erg. We show that one cannot restrict oneself to using the simple analytical formulas relating the supernova and presupernova parameters to obtain reliable parameters for type-IIP presupernovae.