Disintegration of the Aged Open Cluster Berkeley 17

被引：13

作者：

Bhattacharya, Souradeep ^{[1
]}

Mishra, Ishan ^{[2
]}

Vaidya, Kaushar ^{[1
]}

Chen, W. P. ^{[3
]}

机构：

[1] Birla Inst Technol & Sci, Dept Phys, Pilani 333031, Rajasthan, India

[2] Indian Inst Technol Guwahati, Gauhati 781039, Assam, India

[3] Natl Cent Univ, Grad Inst Astron, 300 Jhongda Rd, Jhongli 32001, Taiwan

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 847卷 / 02期

基金：

美国国家航空航天局;

关键词：

blue stragglers; methods: data analysis; star clusters: individual (Berkeley 17); COLOR-MAGNITUDE DIAGRAM; OLD OPEN CLUSTERS; STAR-CLUSTERS; BLUE STRAGGLERS; SKY SURVEY; PHOTOMETRY;

D O I：

10.3847/1538-4357/aa89e2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the analysis of the morphological shape of Berkeley 17, the oldest known open cluster (similar to 10 Gyr), using the probabilistic star counting of Pan-STARRS point sources, and confirm its core-tail shape, plus an antitail, previously detected with the 2MASS data. The stellar population, as diagnosed by the color-magnitude diagram and theoretical isochrones, shows many massive members in the clusters core, whereas there is a paucity of such members in both of the tails. This manifests mass segregation in this aged star cluster with the low-mass members being stripped away from the system. It has been claimed that Berkeley 17 is associated with an excessive number of blue straggler candidates. A comparison of nearby reference fields indicates that about half of these may be field contamination.

引用

页数：7

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