A. Ruelas-Mayorga, L. J. Sanchez, C. A. Bernal-Herrera, A. Nigoche-Netro, J. Echevarria, A. M. Garcia
{"title":"CCD Photometry of the Globular Cluster NGC 5897","authors":"A. Ruelas-Mayorga, L. J. Sanchez, C. A. Bernal-Herrera, A. Nigoche-Netro, J. Echevarria, A. M. Garcia","doi":"10.48550/arxiv.2311.07525","DOIUrl":null,"url":null,"abstract":"We report CCD photometric observations of the globular cluster NGC 5897, in the Johnson system filters B, V , R, and I. With the values for these magnitudes we obtain various colour indices and produce several colour-magnitude diagrams. We present eight colour-magnitude diagrams: V vs B-V , B vs B-V , V vs V-I, I vs V-I, R vs R-I, I vs R-I, V vs V-R, and R vs V-R. In all of these diagrams we can clearly see the Giant Branch, the Horizontal Branch and the beginning of the Main Sequence. To the left of the Main Sequence turn-off point we detect a somewhat large number of Blue Straggler stars. We determine the mean value of the visual magnitude of the HB as $16.60 \\pm 0.46$. This value is fainter than the value found by other authors.","PeriodicalId":496270,"journal":{"name":"arXiv (Cornell University)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv (Cornell University)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.48550/arxiv.2311.07525","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We report CCD photometric observations of the globular cluster NGC 5897, in the Johnson system filters B, V , R, and I. With the values for these magnitudes we obtain various colour indices and produce several colour-magnitude diagrams. We present eight colour-magnitude diagrams: V vs B-V , B vs B-V , V vs V-I, I vs V-I, R vs R-I, I vs R-I, V vs V-R, and R vs V-R. In all of these diagrams we can clearly see the Giant Branch, the Horizontal Branch and the beginning of the Main Sequence. To the left of the Main Sequence turn-off point we detect a somewhat large number of Blue Straggler stars. We determine the mean value of the visual magnitude of the HB as $16.60 \pm 0.46$. This value is fainter than the value found by other authors.
我们报告了球状星团NGC 5897在约翰逊系统B、V、R和i滤光片中的CCD光度观测结果。根据这些星等的值，我们得到了不同的颜色指数，并生成了几个颜色星等图。我们提出了八种色级图:V vs B-V, B vs B-V, V vs V-I, I vs V-I, R vs R-I, I vs R-I, V vs V-R, R vs V-R。在所有这些图中，我们可以清楚地看到巨大分支，水平分支和主序列的开始。在主序星关闭点的左边，我们发现了大量的蓝离散星。我们确定HB的目视星等的平均值为$16.60 \pm 0.46$。此值比其他作者发现的值更微弱。
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