贫金属星的重元素丰度——Ⅰ.观测数据和大气模型

Abundances of Heavy Elements in Metal Deficient Stars——Ⅰ. Observational Material and Model Atmospheres

本文给出了27颗贫金属矮星和亚巨星的高分辨率高信噪比光谱观测资料.确定了这些样本星的恒星大气参数.利用Magain的定标方法,从b—y和V—K包指数导出有效温度.由迫使Fell谱线与高激发态Fel谱线给出相同铁丰度值确定表面重力.由Stromgren m_1色指数确定金属丰度[Fe/H].

In this paper, we present the observational material of high resolution, high signal-to-noise spectra for a sample of 27 metal deficient dwarfs and subgiants. The atmospheric parameters of these program stars have been determined. Effective temperatures were derived from b-y and V-K color indices by using the calibration of Magain. Surface gravities were determined by forcing the Fell lines to indicate the same abundance as the high excitation Fel lines. Metallicities were derived from Stromgrer. mi indices. These results will be used in a subsequent paper to derive heavy element abundances for these program stars.