Showing papers by "Isabelle Baraffe published in 1991"
Journal Article•
TL;DR: In this article, the effects of variable initial metallicity (Z) and initial helium abundance (Y) on the evolutionary tracks, lifetimes and helium core masses of massive stars were investigated.
Abstract: We investigate the effects of variable initial metallicity (Z) and initial helium abundance (Y) on the evolutionary tracks, lifetimes and helium core masses of massive stars. Evolutionary models are presented for stars of masses M=10, 12, 15, 20 and 30 M ⊙ with Z=10 −3 , 10 −4 and 10 −6 . Stars with Z=0.02 are also considered for the sake of comparison. The stellar models have been calculated up to the advanced stage of core carbon burning. Preliminary results of the s-process nucleosynthesis occurring during the core helium burning phase are also given.
4 citations
01 Jan 1991
TL;DR: In this paper, two kinds of models are discussed in the context of the observations: one using restricted convection (see e.g. contributions of S. Woosley and T. Weaver to this volume), and another assuming substantial mixing of core material into the hydrogen envelope.
Abstract: Out of the many attempts to model the progenitor evolution of SN 1987A (see reviews by Hillebrandt and Hoflich, 1989; Arnett et al., 1989), only two kinds of models are still discussed in the context of the observations: one using “restricted convection” (see e.g. contributions of S. Woosley and T. Weaver to this volume), and another assuming substantial mixing of core material into the hydrogen envelope (cf. e.g. K. Nomoto, this volume). The basic drawback of both kinds of models is a lack of theoretical justification of the applied physics. However, stellar models involving just the standard physics apparently fail in reproducing the blue-red-blue evolution of the SN 1987A progenitor.