银沼星际 Halo中r-process 元素铕的富集
天体物理学
2007-05-23 v3 广义相对论与量子宇宙学
核理论
摘要
我们研究了铕作为r-process 元素的代表，对银沼星际介质中铕的富集情况。在现有的化学演化模型中，假设恒星通过超新星(SNe)的冲击过程形成。我们采用单区方法计算星际介质的富集。我们指出，观察到的 [Eu/Fe] 在金属丰度增加时趋于收敛的大幅离散现象，可由本模型解释。此外，约束了进行r-process 的超新星质量范围为8-10太阳质量或>=30太阳质量。
引用
@article{arxiv.astro-ph/9812066,
title = {A Model for Most Luminous and Long Duration Cosmic Gamma Ray Bursts},
author = {Abhas Mitra},
journal= {arXiv preprint arXiv:astro-ph/9812066},
year = {2007}
}
备注
Extensively revised folowing referee comments. Emphasized that an UCO is nothing but a NS with somewhat more mass and smaller radius as allowed by existing EOSs and GTR. Pointed out that baryonic pollution could be negligible, It may explain all luminous GRBs recorded so far (5. 10**53 erg) which are suggested to be spherical by late afterglow observations, except probably GRB990123