Near-IR photometry of five Galactic Globular Clusters
Near-IR photometry of five Galactic Globular Clusters
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DOI：
10.1051/0004-6361:20034402
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发表时间：
2004-01
影响因子：
6.5
通讯作者：
E. Valenti;E. Valenti;F. Ferraro;S. Perina;L. Origlia
中科院分区：
文献类型：
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作者：
E. Valenti;E. Valenti;F. Ferraro;S. Perina;L. Origlia
我们给出了在伽利略望远镜(TNG)上获得的五个贫金属球状星系团(即M3、M5、M10、M13和M92)中巨星的近红外J和K观测结果。这个数据库已经被用来从(K，J-K)确定红巨星分支(RGB)的主要光度性质，一旦与光学数据结合，就在(K，V-K)色等图中。测量了一组光度指数(固定大小的RGB颜色)和主要的RGB演化特征(斜率、凹凸、尖端)。将所得结果与Ferraro等人的关系式进行了比较。(2000)与理论预期表现出很好的一致性。
We present near-infrared J and K observations of giant stars in five metal-poor Galactic Globular Clusters (namely M3, M5, M 10, M 13 and M92) obtained at the Telescopio Nazionale Galileo (TNG). This database has been used to determine the main photometric properties of the red giant branch (RGB) from the (K, J - K) and, once combined with the optical data, in the (K, V - K) Color Magnitude Diagrams. A set of photometric indices (the RGB colors at fixed magnitudes) and the major RGB evolutionary features (slope, bump, tip) have been measured. The results have been compared with the relations obtained by Ferraro et al. (2000) and with the theoretical expectations, showing a very good agreement.