UV中的恒星星族模型：I.新一代恒星图书馆的特征
Stellar population models in the UV: I. Characterisation of the New Generation Stellar Library
摘要：
恒星星族模型的光谱预测在紫外波段不如在光波段准确。原因之一是缺乏高质量的恒星库。最近发布的新一代恒星图书馆（NGSL）是朝着改善这种情况迈出的重要一步。为了准备NGSL的人口合成，我们确定了其恒星的大气参数，我们评估了波长校准的精度，并表征了其固有的分辨率。我们还测量了每颗NGSL恒星的银河系消光。对于我们的分析，我们使用ULySS，一个完整的光谱拟合包，根据MILES拟合NGSL光谱。我们发现，波长校准是精确到0.1像素，校正后的光学范围内的系统效应。光谱分辨率从紫外线的3 μ m到近红外线的10 μ m不等，对应于大致恒定的倒数分辨率R ~ 1000和仪器速度色散$σ_{ins}$ ~ 130 km/s。我们均匀地导出了大气参数。FGK星的精度为42 K，Teff、logg和[Fe/H]的精度分别为0.24和0.09 dex。M星的相应平均误差分别为29 K、0.50和0.48dex，OBA星的相应平均误差分别为4.5%、0.44和0.18dex。与文献的比较表明，我们的结果是没有偏见的。
英文摘要：
The spectral predictions of stellar population models are not as accurate in the ultra-violet (UV) as in the optical wavelength domain. One of the reasons is the lack of high-quality stellar libraries. The New Generation Stellar Library (NGSL), recently released,represents a significant step towards the improvement of this situation. To prepare NGSL for population synthesis, we determined the atmospheric parameters of its stars, we assessed the precision of the wavelength calibration and characterised its intrinsic resolution. We also measured the Galactic extinction for each of the NGSL stars. For our analyses we used ULySS, a full spectrum fitting package, fitting the NGSL spectra against the MILES interpolator. We find that the wavelength calibration is precise up to 0.1 px, after correcting a systematic effect in the optical range. The spectral resolution varies from 3Å in the UV to 10Å in the near-infrared (NIR), corresponding to a roughly constant reciprocal resolution R ~ 1000 and an instrumental velocity dispersion $σ_{ins}$ ~ 130 km/s. We derived the atmospheric parameters homogeneously. The precision for the FGK stars is 42K, 0.24 and 0.09 dex for Teff, logg and [Fe/H], respectively. The corresponding mean errors are 29K, 0.50 and 0.48 dex for theMstars, and for the OBA stars they are 4.5 percent, 0.44 and 0.18 dex. The comparison with the literature shows that our results are not biased.
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