Multicolor photometric study of M31 globular clusters
Multicolor photometric study of M31 globular clusters
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DOI：
10.1088/1674-4527/9/9/005
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发表时间：
2009-06
影响因子：
1.8
通讯作者：
Z. Fan;J. Ma;X. Z. N. A. Observatories;Chinese Academy of Sciences
中科院分区：
文献类型：
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作者：
Z. Fan;J. Ma;X. Z. N. A. Observatories;Chinese Academy of Sciences
利用北京-亚利桑那州-台湾-康涅狄格州（BATC）多色巡天中观测到的M31的存档CCD影像，在15个中波段滤光片上对30个球状星团（GC）和GC候选者进行了测光研究，观测波段从10000 A到10000 A。我们将这些中间波段光度数据转换为标准UBV RI宽波段的光度。这些M31 GC候选者是从修订的博洛尼亚星表（RBC V.3.5）中选出的，这些候选者中的大多数没有任何光度数据。因此，所提供的光度数据是对RBC V.3.5的补充。我们发现RBC V.3.5中的61个GC和GC候选者中有4个在其位置的BATC图像上没有显示任何信号。利用RBC V.3.5的数据对蓝色GC和GC候选者的色幅图进行线性拟合，发现蓝色M31 GC的“蓝倾”具有较高的置信度，分别为99.95%和3。47 σ的确认的GC，和> 99。99%或4。GC和GC候选人为87 σ。
We present the photometry of 30 globular clusters (GCs) and GC candidates in 15 intermediate-band fi lters covering the wavelength region from ∼ 3000 to ∼ 10 000 A using the archival CCD images of M31 observed as part of the Beijing - Arizona - Taiwan - Connecticut (BATC) Multicolor Sky Survey. We transform these intermediate-band photometric data into the photometry in the standard UBV RI broadbands. These M31 GC candidates are selected from the Revised Bologna Catalog (RBC V.3.5), and most of these candidates do not have any photometric data. Therefore, the presented photometric data are a supplement to the RBC V.3.5. We fi nd that 4 out of 61 GCs and GC candidates in RBC V.3.5 do not show any signal on the BATC images at their locations. By applying a linear fi t of the distribution in the color-magnitude diagram of blue GCs and GC candidates using data from the RBC V.3.5, in this study, we fi nd the “blue-tilt” of blue M31 GCs with a high con fi dence at 99.95% or 3 . 47 σ for the con fi rmed GCs, and > 99 . 99% or 4 . 87 σ for GCs and GC candidates.