MILES恒星的大气参数和光谱特征
The atmospheric parameters and spectral interpolator for the stars of MILES
摘要：
上下文恒星光谱的经验库用于恒星分类和恒星星族的合成。MILES是一个中等光谱分辨率的光域库，涵盖了广泛的温度，表面重力和金属丰度。目标。我们重新确定这些恒星的大气参数，以提高均匀性和精度。我们建立了一个插值函数，返回光谱作为三个大气参数的函数，最后，我们表征的波长校准的精度和光谱分辨率的稳定性。方法.我们使用的ULySS程序与EQUIPDIE库作为参考，并与文献汇编的结果进行比较。结果对FGK星的Teff、log g和[Fe/H]的计算精度分别为60 K、0.13和0.05 dex。M星的平均误差分别为38 K、0.26和0.12 dex，OBA星的平均误差分别为3.5%、0.17和0.13 dex。我们构造了一个模型，并对MILES恒星本身进行了测试。我们还通过测量CFLIB星的大气参数与MILES作为参考，并发现它是更可靠的比ESTDIE ESTDIE演化的热星，特别是像那些蓝色的水平分支。
英文摘要：
Context. Empirical libraries of stellar spectra are used for stellar classification and synthesis of stellar populations. MILES is a medium spectral-resolution library in the optical domain covering a wide range of temperatures, surface gravities and metallicities. Aims. We re-determine the atmospheric parameters of these stars in order to improve the homogeneity and accuracy. We build an interpolating function that returns a spectrum as a function of the three atmospheric parameters, and finally, we characterize the precision of the wavelength calibration and stability of the spectral resolution. Methods. We use the ULySS program with the ELODIE library as a reference and compare the results with literature compilations. Results. We obtain precisions of 60 K, 0.13 and 0.05 dex respectively for Teff, log g and [Fe/H] for the FGK stars. For the M stars, the mean errors are 38 K, 0.26 and 0.12 dex, and for the OBA 3.5%, 0.17 and 0.13 dex. We construct an interpolator that we test against the MILES stars themselves. We test it also by measuring the atmospheric parameters of the CFLIB stars with MILES as reference and find it to be more reliable than the ELODIE interpolator for the evolved hot stars, like in particular those of the blue horizontal branch.
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