An optical and near IR study of the old open cluster NGC 2141
An optical and near IR study of the old open cluster NGC 2141
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DOI：
10.1051/0004-6361:20010558
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发表时间：
2001-05
影响因子：
6.5
通讯作者：
G. Carraro;S. Hassan;S. Ortolani;A. Vallenari
中科院分区：
文献类型：
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作者：
G. Carraro;S. Hassan;S. Ortolani;A. Vallenari
我们报道了在老疏散星团NGC 2141区域的CCD光学（B和V波段）和近红外（J和K波段）观测。通过结合两组光度测量（共有500颗恒星），我们得出了对星团基本参数的新估计。我们确认这个星团的年龄是2.5 Gyrs，但是，相对于之前的研究，我们得到了一个稍微大一点的红点（E(B V)=0:40），和一个稍微短一点的距离（3.8 kpc）到太阳。最后，我们给出了V波段的光度函数（LF），这是另一个年龄指标。我们通过假设Kroupa等人（1993）IMF高达MV = 5.0，为从等时线推断的年龄范围提供了良好的t。我们把细微的分歧解释为大规模种族隔离的证据。
We report CCD optical (B and V passbands) and near IR (J and K bands) observations in the region of the old open cluster NGC 2141. By combining the two sets of photometry (500 stars in common) we derive new estimates of the cluster's fundamental parameters. We conrm that the cluster is 2.5 Gyrs old, but, with respect to previous investigations, we obtain a slightly larger reddening (E(B V )=0 :40), and a slightly shorter distance (3.8 kpc) from the Sun. Finally, we present the Luminosity Function (LF) in the V band, which is another age indicator. We provide a good t for the age range inferred from isochrones by assuming the Kroupa et al. (1993) IMF up to MV = 5.0. We interpret the disagreement at fainter magnitudes as evidence of mass segregation.