Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows

	Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows
	Hu, Tao 1,2; Wang M(汪敏)2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2014-03
卷号	438 期号:4 页码:3443-3455
关键词	nuclear reactions, nucleosynthesis, abundances stars: abundances stars: Wolf-Rayet galaxies: abundances gamma-rays: ISM
ISSN号	0035-8711
通讯作者	Hu, T (reprint author), Shanghai Univ, Dept Automat, Shanghai 200072, Peoples R China.
产权排序	第二完成单位
英文摘要	Gamma-ray burst (GRB) ejecta carries huge amounts of energy expanding into the surrounding medium and heats up these materials, making it possible that nucleosynthesis can take place in such hot sites in afterglow stage. Here, we study possible changes in chemical abundances in the GRB afterglow processes of Wolf-Rayet (WR) star wind environments (Case A) and constant density surroundings (Case B). We find that the light element of lithium-beryllium-boron could occur in the afterglows via He+He process and spallation reactions. Some isotopes of F, Ne, Mg, Al, Si, P, S and Fe-group elements are also new species formed in the afterglows via proton-, neutron- and alpha-capture. The results show that the nucleosynthetic yields might be a diagnostic of the GRB's ambient environment. Our calculations indicate that Mg, Al, Si, P, Cr, Mn, Fe and Co have trended to appear in Case A, while Ne, Ti and Ni trend to occur in Case B. Furthermore, although some species have occurred both in Cases A and B, their mass fractions are quite different in these two cases. Here, we show that the mass fractions of Li-7, Be-7, Mg-24 and Si-30 are higher in Case A than that in Case B, but F-18 gives an opposite conclusion. Nucleosynthetic outputs might also be an indice to estimate the luminosity-temperature relation factor beta. In this study, when beta reduces, the mass abundances of B-11 and Ne-20 are higher in Case B than that in Case A; in contrast, as the beta becomes larger, this trend would be reversed; therefore, perhaps we could select the above elements as the indicators to estimate the properties of the surroundings around the GRBs. We also suggest that the spectroscopic observations of a GRB afterglow could only reveal the nucleosynthetic outputs from the interaction site between the GRB jet and its ambient matter, but could not represent the original composition of the pre-GRB surrounding medium.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	WIND-INTERACTION-MODELS ; COSMOLOGICAL FIREBALL MODEL ; 25 APRIL 1998 ; BLACK-HOLES ; UNUSUAL SUPERNOVA ; ACCRETION DISKS ; OPTICAL FLASH ; MASSIVE STARS ; LIGHT CURVES ; GRB 970228
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/438/4/3443
语种	英语
WOS记录号	WOS:000332038000058
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5633]
专题	云南天文台_射电天文研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Department of Automation, Shanghai University, Shanghai 200072, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Yunnan Astronomical Observatory, Fenghuang Mountain, Kunming 650011, China
推荐引用方式 GB/T 7714	Hu, Tao,Wang M. Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,438(4):3443-3455.
APA	Hu, Tao,&Wang M.(2014).Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,438(4),3443-3455.
MLA	Hu, Tao,et al."Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 438.4(2014):3443-3455.