疏散星团的互相关光谱表征
Open Cluster Characterization via Cross-Correlation with Spectral Library
摘要：
本文提出了一种基于光谱互相关的恒星聚集体ESO 442-SC 04的物理参数表征方法。所用数据是用Gemini-South望远镜的GMOS获得的，包括17颗位于天体中心区域的恒星和6颗标准星。FXCOR被用于迭代过程，以获得标准星的自洽径向速度和科学光谱的平均径向速度。利用FXCOR将聚类谱与ESDIE光谱库进行关联，并利用TdR和Davis比（TDR）选择最佳关联匹配，确定了光谱类型、有效温度、表面重力和金属丰度参数。对结果的分析表明，ESO 442-SC 04中的恒星没有被束缚，因此它们不构成一个物理系统。
英文摘要：
We present a characterization method based on spectral cross-correlation to obtain the physical parameters of the controversial stellar aggregate ESO442-SC04. The data used was obtained with GMOS at Gemini-South telescope including 17 stars in the central region of the ob ject and 6 standard-stars. FXCOR was used in an iterative process to obtain self-consistent radial velocities for the standard-stars and averaged radial velocities for the science spectra. Spectral types, effective temperature, suface gravity and metallicities parameters were determined using FXCOR to correlate cluster spectra with ELODIE spectral library and selecting the best correlation matches using the Tonry and Davis Ratio (TDR). Analysis of the results suggests that the stars in ESO442-SC04 are not bound and therefore they do not constitute a physical system.
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