用于恒星星族分析的高分辨率谱线指数
High Resolution Spectral Line Indices Useful for the Analysis of Stellar Populations
摘要：
众所周知的年龄-金属丰度-衰减简并不允许对恒星和恒星星族的基本参数进行唯一和良好的估计。利用谱线指数可以避免尘埃的影响，但目前的方法还不能打破年龄-金属丰度简并性。在这里，我们表明，使用至少两个新的谱线指数的定义和测量的高分辨率（R= 6000）光谱的信噪比（S/N）> 10得到明确的估计年龄和金属丰度的中老恒星星族。用新的天文设施检索光谱数据，例如，X-shooter、MEGARA和MOSAIC等仪器可通过谱线指数和指数-指数图分析来推断发射源的物理参数。
英文摘要：
The well-known age-metallicity-attenuation degeneracy does not permit unique and good estimates of basic parameters of stars and stellar populations. The effects of dust can be avoided using spectral line indices, but current methods have not been able to break the age-metallicity degeneracy. Here we show that using at least two new spectral line indices defined and measured on high-resolution (R= 6000) spectra of a signal-to-noise ratio (S/N) > 10 one gets unambiguous estimates of the age and metallicity of intermediate to old stellar populations. Spectroscopic data retrieved with new astronomical facilities, e.g., X-shooter, MEGARA, and MOSAIC, can be employed to infer the physical parameters of the emitting source by means of spectral line index and index--index diagram analysis.
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