RELATIVE AGE DIFFERENCE BETWEEN THE METAL-POOR GLOBULAR CLUSTERS M53 AND M92

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Journal of the Korean Astronomical Society Pub Date : 2016-10-31 DOI:10.5303/JKAS.2016.49.5.175
D. Cho, H. Sung, Sanggak Lee, T. Yoon
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引用次数: 1

Abstract

CCD photometric observations of the globular cluster (GC), M53 (NGC 5024), are performed using the 1.8 m telescope at the Bohyunsan Optical Astronomy Observatory in Korea on the same nights (2002 April and 2003 May) as the observations of the GC M92 (NGC 6341) reported by Cho and Lee using the same instrumental setup. The data for M53 is reduced using the same method as used for M92 by Cho and Lee, including preprocessing, point-spread function fitting photometry, and standardization etc. Therefore, M53 and M92 are on the same photometric system defined by Landolt, and the photometry of M53 and M92 is tied together as closely as possible. After complete photometric reduction, the V versus B − V , V versus V − I, and V versus B − I color-magnitude diagrams (CMDs) of M53 are produced to derive the relative ages of M53 and M92 and derive the various characteristics of its CMDs in future analysis. From the present analysis, the relative ages of M53 and M92 are derived using the Δ(B − V ) method reported by VandenBerg et al. The relative age of M53 is found to be 1.6 ± 0.85 Gyr younger than that of M92 if the absolute age of M92 is taken to be 14 Gyr. This relative age difference between M53 and M92 causes slight differences in the horizontal-branch morphology of these two GCs.
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贫金属球状星团m53和m92的相对年龄差异
球状星团M53 (NGC 5024)的CCD光度观测,是在韩国宝贤山光学天文台的1.8米望远镜上进行的,在同一个晚上(2002年4月和2003年5月),Cho和Lee使用相同的仪器装置对GC M92 (NGC 6341)进行了观测。Cho和Lee采用与M92相同的方法对M53的数据进行了简化,包括预处理、点扩展函数拟合测光和标准化等。因此,M53和M92在由Landolt定义的同一光度系统上,M53和M92的光度测定尽可能紧密地联系在一起。在完成光度还原后,生成了M53的V对B−V、V对V−I和V对B−I的色星等图(CMDs),从而推导出M53和M92的相对年龄,并在未来的分析中推导出其CMDs的各种特征。根据目前的分析,使用VandenBerg等人报道的Δ(B−V)方法推导出M53和M92的相对年龄。如果取M92的绝对年龄为14 Gyr,则M53的相对年龄比M92小1.6±0.85 Gyr。M53和M92之间的相对年龄差异导致这两种gc的水平分支形态略有差异。
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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