标题： 基于线深度比的181颗F-K矮星的高精度有效温度 显示英文标题

标题： High precision effective temperatures for 181 F--K dwarfs from line-depth ratios

摘要： 利用高分辨率（R=42000）、高信噪比的光栅光谱所测量的线深度比，用于确定181颗FGK型主要序列星的精确有效温度，这些恒星具有接近太阳金属丰度（-0.5 < [Fe/H] < +0.5）。 得到了一组105个关系式，这些关系式基于高激发势和低激发势线强度比，并以先前发表的精确（1%）温度估算为校准依据。 这些校准的应用范围为4000–6150 K（F8V–K7V）。 单一校准的内部误差小于100 K，而对于信噪比S/N=100的光谱，所有校准的组合将不确定性降低到仅5–10 K；对于S/N=200或更高的光谱，则降低到优于5 K。温度标尺的零点直接由太阳反射光谱定义，其不确定性约为1 K。讨论了此方法在系外行星宿主恒星特性研究中的应用。 显示英文摘要

摘要： Line depth ratios measured on high resolution (R=42000), high S/N echelle spectra are used for the determination of precise effective temperatures of 181 F,G,K Main Sequence stars with about solar metallicity (-0.5 < [Fe/H] < +0.5). A set of 105 relations is obtained which rely Teff on ratios of the strengths of lines with high and low excitation potentials, calibrated against previously published precise (1%) temperature estimates. The application range of the calibrations is 4000--6150 K (F8V--K7V). The internal error of a single calibration is less than 100 K, while the combination of all calibrations for a spectrum of S/N=100 reduces uncertainty to only 5-10 K, and for S/N=200 or higher, to better than 5 K. The zero point of the temperature scale is directly defined from reflection spectra of the Sun with an uncertainty about 1 K. The application of this method to investigation of the planet host stars properties is discussed.