Kumar 2008 伽玛暴前身星的特性

主要内容:
science in press

精彩摘抄:
不同颜色区域表示能源产生于不同的半径处的吸积。

文章信息:

· arXiv e-print (arXiv:0807.0445)

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Title:		Properties of Gamma-Ray Burst Progenitor Stars
Authors:		Kumar, Pawan; Narayan, Ramesh; Johnson, Jarrett L.
Publication:		eprint arXiv:0807.0445
Publication Date:		07/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		Science in press
Bibliographic Code:		2008arXiv0807.0445K

Abstract

We determine some basic properties of stars that produce spectacular gamma-ray bursts at the end of their life. We assume that accretion of the outer portion of the stellar core by a central black hole fuels the prompt emission, and that fall-back and accretion of the stellar envelope later produces the plateau in the X-ray light curve seen in some bursts. Using X-ray data for three bursts we estimate the radius of the stellar core to be ~ 1-3 x 10^10 cm, and that of the stellar envelope to be ~ 1-2 x 10^11 cm. The density profile in the envelope is fairly shallow, with \rho ~ r^-2. The rotation speeds of the core and envelope are ~ 0.05 and ~ 0.2 of the local Keplerian speed, respectively.

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