Bogomazov 2008 长暴宿主星系的形态及暗示

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long gamma-ray bursts result from the core collapse of massive Wolf-Rayet stars in close binaries。

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Title:		Long gamma-ray bursts and the morphology of their host galaxies
Authors:		Bogomazov, A. I.; Lipunov, V. M.; Tutukov, A. V.
Affiliation:		AA(Sternberg Astronomical Institute, Lomonosov Moscow State University), AB(Sternberg Astronomical Institute, Lomonosov Moscow State University), AC(Institute of Astronomy, Russian Academy of Sciences)
Publication:		Astronomy Reports, Volume 52, Issue 6, pp.463-466
Publication Date:		06/2008
Origin:		SPRINGER
Keywords:		98.70.Rz, 98.62.Lv, 97.80.Jp
Abstract Copyright:		(c) 2008: Pleiades Publishing, Ltd.
DOI:		10.1134/S1063772908060036
Bibliographic Code:		2008ARep...52..463B

Abstract

We present the results of population syntheses for binary stars carried out using the “Scenario Machine” code with the aim of analyzing events that may result in long gamma-ray bursts. We show that the observed distribution of morphological types of the host galaxies of long gamma-ray bursts can be explained in a model in which long gamma-ray bursts result from the core collapse of massive Wolf-Rayet stars in close binaries. The dependence of the burst rate on galaxy type is associated with an increase in the rate of stellar-wind mass-loss with increasing stellar metallicity. The separation of binary components at the end of their evolution increases with the stellar-wind rate, resulting in a reduction of the number of binaries that produce gamma-bursts.

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