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arXiv 0803.3014astro-ph
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系外行星宿主恒星的锂丰度

Lithium abundances in exoplanet-hosts stars

M. Castro, S. Vauclair, O. Richard, N. C. Santos

摘要:

已知系外行星宿主恒星(EHS)表面的化学丰度与没有探测到行星的恒星(NEHS)不同。平均而言,EHS与太阳相比金属含量过高。观测结果还表明,对于冷恒星,锂在EHS中比在NEHS中更耗尽。EHS的过金属性可以在两个不同的框架下进行研究。计算了不同质量、不同金属丰度和不同吸积率的主序星模型。结果表明,根据不同的情况,锂的破坏情况不同。我们将这些结果与锂的光谱观测进行了比较。

英文摘要:

Exoplanet-host stars (EHS) are known to present surface chemical abundances different from those of stars without any detected planet (NEHS). EHS are, on the average, overmetallic compared to the Sun. The observations also show that, for cool stars, lithium is more depleted in EHS than in NEHS. The overmetallicity of EHS may be studied in the framework of two different scenarii. We have computed main sequence stellar models with various masses, metallicities and accretion rates. The results show different profiles for the lithium destruction according to the scenario. We compare these results to the spectroscopic observations of lithium.

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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