SPECTRAL ENERGY DISTRIBUTIONS AND MASSES OF 304 M31 OLD STAR CLUSTERS
SPECTRAL ENERGY DISTRIBUTIONS AND MASSES OF 304 M31 OLD STAR CLUSTERS
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DOI：
10.1088/0004-6256/149/2/56
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
Jun Ma;Song-Yun Wang;Zhenyu Wu;Tianmeng Zhang;H. Zou;J. Nie;Zhi-min Zhou;Xu Zhou;Jianghua Wu;C. Du;Q. Z. D. O. Astronomy;National Astronomical Observatories;Chinese Academy of Sciences;Beijing;China.
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文献类型：
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作者：
Jun Ma;Song-Yun Wang;Zhenyu Wu;Tianmeng Zhang;H. Zou;J. Nie;Zhi-min Zhou;Xu Zhou;Jianghua Wu;C. Du;Q. Z. D. O. Astronomy;National Astronomical Observatories;Chinese Academy of Sciences;Beijing;China.
本文对邻近旋涡星系M31中的304个老星星团进行了CCD测光，首次获得了其中55个星星团的测光结果。这些观测是作为北京-亚利桑那-台湾-康涅狄格多色巡天的一部分，从1995年2月到2008年3月，使用了15个覆盖3000-10000流明的中频滤波器。详细的比较表明，我们的测光是与以前的测量。根据考德威尔等人的年龄和金属丰度以及本文的光度测量结果，通过比较它们的光度测量结果和星族合成模型，我们估算了星团的质量。结果表明，样品团簇的质量在103 × 104 M ~（-1）之间。和10 7 M ⊙？>峰值为104 × 105 M？.这里的质量与以前的研究结果很一致。结合Wang等人的M31年轻星星团的质量，我们发现老星系团的峰值质量是年轻星系团的10倍。
This paper presents CCD multicolor photometry for 304 old star clusters in the nearby spiral galaxy M31, from which the photometry of 55 star clusters is first obtained. The observations were carried out as a part of the Beijing–Arizona–Taiwan–Connecticut Multicolor Sky Survey from 1995 February to 2008 March, using 15 intermediate-band filters covering 3000–10000 Å. Detailed comparisons show that our photometry is in agreement with previous measurements. Based on the ages and metallicities from Caldwell et al. and the photometric measurements here, we estimated the clusters’ masses by comparing their multicolor photometry with stellar population synthesis models. The results show that the sample clusters have masses between ∼ 3 × 10 4 M ⊙ ?> and ∼ 10 7 M ⊙ ?> with a peak of ∼ 4 × 10 5 M ⊙ ?> . The masses here are in good agreement with those in previous studies. Combined with the masses of young star clusters of M31 from Wang et al., we find that the peak mass of the old clusters is 10 times that of young clusters.