期刊
ASTRONOMY & ASTROPHYSICS
卷 442, 期 3, 页码 917-924出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053089
关键词
open clusters and associations : individual : Berkeley 73, Berkeley 75, Berkeley 25; open clusters and associations : general; Hertzprung-Russell (HR) and C-M diagrams
CCD BVI photometry of the faint open clusters Berkeley 73, Berkeley 75 and Berkeley 25 are presented. The two latter are previously unstudied clusters to our knowledge. While Berkeley 73 is found to be of intermediate-age ( about 1.5 Gyr old), Berkeley 75 and Berkeley 25 are old clusters, with ages greater than 3.0 Gyr. We provide also estimates of the clusters size. All these clusters lie far away from the Galactic Center, at R(GC) >= 16 kpc, and quite high on the Galactic plane, at |Z(.)| >= 1.5 kpc. They are therefore important targets to probe the properties of the structure of the Galaxy in this direction, where the Canis Major over-density has been discovered to be located.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据