高遮蔽球状星团2 MASS GC02和Mercer 5的化学丰度
Chemical Abundances of the Highly Obscured Galactic Globular Clusters 2MASS GC02 and Mercer 5
摘要：
我们提出了第一个高光谱分辨率丰度分析的两个新发现的银河系球状星团，即Mercer 5和2 MASS GC 02居住在高星际红化的区域在银河系中心的方向。这些数据是在15500.0 A - 15575.0 A光谱区用位于Gemini South（R~50000）的Phoenix高分辨率近红外阶梯光栅光谱仪获得的。铁，氧，硅，钛和镍的丰度是由两个红巨星，在每个集群，通过比较整个观察到的光谱与MOOG生成的合成光谱网格。我们发现Mercer 5和2 MASS GC 02的[Fe/H]值分别为-0.86 +/-0.12和-1.08 +/-0.13。Mercer 5恒星的[O/Fe]、[Si/Fe]和[Ti/Fe]比值在此金属丰度下遵循球区和星团恒星的一般趋势，并增加了>+0.3。2 MASS GC 02恒星的比率相对较低，但仍与其他球型星团相容。根据这两个天体的金属丰度和丰度模式，我们得出结论，这是典型的凸起球状星团。
英文摘要：
We present the first high spectral resolution abundance analysis of two newly discovered Galactic globular clusters, namely Mercer 5 and 2MASS GC02 residing in regions of high interstellar reddening in the direction of the Galactic center. The data were acquired with the Phoenix high-resolution near-infrared echelle spectrograph at Gemini South (R~50000) in the 15500.0 A - 15575.0 A spectral region. Iron, Oxygen, Silicon, Titanium and Nickel abundances were derived for two red giant stars, in each cluster, by comparing the entire observed spectrum with a grid of synthetic spectra generated with MOOG. We found [Fe/H] values of -0.86 +/- 0.12 and -1.08 +/- 0.13 for Mercer 5 and 2MASS GC02 respectively. The [O/Fe], [Si/Fe] and [Ti/Fe] ratios of the measured stars of Mercer 5 follow the general trend of both bulge field and cluster stars at this metallicity, and are enhanced by > +0.3. The 2MASS GC02 stars have relatively lower ratios, but still compatible with other bulge clusters. Based on metallicity and abundance patterns of both objects we conclude that these are typical bulge globular clusters.
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