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Chemical abundances associated with gamma-ray bursts: nucleosynthesis in afterglows
Hu, Tao1,2; Wang M(汪敏)2; Hu, T (reprint author), Shanghai Univ, Dept Automat, Shanghai 200072, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014-03
卷号438期号:4页码:3443-3455
DOI10.1093/mnras/stt2450
产权排序第2完成单位
收录类别SCI
关键词Stars: Abundances Nuclear Reactions Stars: Wolf-rayet Nucleosynthesis Galaxies: Abundances Abundances Gamma-rays: Ism
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.
项目资助者Foundation of Key Laboratory for the Structure and Evolution of Celestial Objects of Chinese Academy of Sciences [OP201202] ; National Natural Science Foundation of China (Astronomy United Foundation of NSFC-CAS) [U1331103]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000332038000058
WOS研究方向Astronomy & Astrophysics
WOS类目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
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5633
专题射电天文研究组
中国科学院天体结构与演化重点实验室
通讯作者Hu, T (reprint author), Shanghai Univ, Dept Automat, Shanghai 200072, Peoples R China.
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
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Hu, Tao,Wang M,Hu, T . 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,&Hu, T .(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.
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