来自宾夕法尼亚州的红巨星-托伦行星搜索
Red giants from the Pennsylvania - Torun Planet Search
摘要：
宾夕法尼亚-托伦行星搜索（PTPS）的主要目标是使用高精度径向速度（RV）技术探测和描述演化恒星周围的行星。该项目使用9.2米的霍比-埃伯利望远镜进行。为了确定巡天观测目标的恒星参数和演变状况，需要对所有物体进行全面的光谱分析。本文在分析Fe I和Fe II谱线等效宽度的基础上，采用严格的光谱方法给出了一个红巨星团簇星子样本的大气参数（有效温度、表面重力、微湍流速度和金属丰度）。结果表明，我们的光谱方法带来了可靠和一致的结果。
英文摘要：
The main goal of the Pennsylvania - Torun Planet Search (PTPS) is detection and characterization of planets around evolved stars using the high-accuracy radial velocity (RV) technique. The project is performed with the 9.2 m Hobby-Eberly Telescope. To determine stellar parameters and evolutionary status for targets observed within the survey complete spectral analysis of all objects is required. In this paper we present the atmospheric parameters (effective temperatures, surface gravities, microturbulent velocities and metallicities) of a subsample of Red Giant Clump stars using strictly spectroscopic methods based on analysis of equivalent widths of Fe I and Fe II lines. It is shown that our spectroscopic approach brings reliable and consistent results.
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