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arXiv 1004.0116astro-ph.SR
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虚拟天文台时代的恒星合成光谱学

Stellar synthetic spectroscopy in the Virtual Observatory era

Bertrand Plez

摘要:

参数包括在VO大网格的合成光谱完全覆盖HR图。一个明显的需要是在所有红移的人口合成。理论光谱还具有预测特殊行为的能力,这些行为可能在观察到的光谱中未被注意到,或导致错误的结论。一个有趣的例子是极端贫金属恒星中的Ca II H & K线。在富碳大气中,H & K线相对于连续谱变得更弱,这将导致低估金属丰度。实际发生的是连续谱的位移,这在绝对通量合成光谱中很明显,但在观测到的连续归一化光谱中看不到。图书馆的合成光谱的描述,以及用于计算它们的代码。对通过VO提供这些库的问题以及必要的输入数据,即行列表和模型大气,作了一些评论。

英文摘要:

Arguments for including in the VO large grids of synthetic spectra fully covering the HR diagram are presented. One obvious need is that of population synthesis at all redshifts. Theoretical spectra have also the power to predict peculiar behaviors, that could remain unnoticed in observed spectra, or lead to erroneous conclusions. One interesting example is given of the Ca II H & K lines in extremely metal-poor stars. In carbon-rich atmospheres, the H & K lines become much weaker relative to the continuum, which will lead to an underestimate of the metallicity. What actually happens is a displacement of the continuum, obvious in absolute-flux synthetic spectra, but not visible in observed continuum-normalized spectra. Libraries of synthetic spectra are described, as well as the codes used to compute them. A few remarks are made on issues with making these libraries available through the VO, as well as on the necessary input data, i.e. line lists and model atmospheres.

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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