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arXiv 1012.5146astro-ph.EP
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恒星形成过程中超新星富集太阳系诞生环境的氧同位素天文学证据

Astronomical Oxygen Isotopic Evidence for Supernova Enrichment of the Solar System Birth Environment by Propagating Star Formation

Edward D. Young, Matthieu Gounelle, Rachel L. Smith, Mark R. Morris, Klaus M. Pontoppidan

摘要:

对来自单个年轻恒星物体的CO气体中氧同位素比的新红外吸收测量证实,与银河系中的太阳外氧相比,太阳系的18 O/17 O比异常高。我们表明,氧同位素比的这种差异是最好的解释为1%的浓缩原太阳分子云的喷出物从II型超新星从一个集群有几百颗恒星,早于太阳至少10至20万年。外源氧的可能来源是一颗或多颗B星在恒星形成过程中的爆炸。

英文摘要:

New infrared absorption measurements of oxygen isotope ratios in CO gas from individual young stellar objects confirm that the solar system is anomalously high in its 18O/17O ratio compared with extra-solar oxygen in the Galaxy. We show that this difference in oxygen isotope ratios is best explained by 1 per cent enrichment of the proto-solar molecular cloud by ejecta from type II supernovae from a cluster having of order a few hundred stars that predated the Sun by at least 10 to 20 Myr. The likely source of exogenous oxygen was the explosion of one or more B stars during a process of propagating star formation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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