THE YOUNG OPEN CLUSTER BERKELEY 55

被引：11
作者：
Negueruela, Ignacio [1 ]
Marco, Amparo [1 ]
机构：
[1] Univ Alicante, Dept Fis, E-03080 Alicante, Spain
来源：
ASTRONOMICAL JOURNAL | 2012年 / 143卷 / 02期
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
Galaxy: structure; open clusters and associations: individual (Berkeley 55); stars: early-type; stars: evolution; supergiants; INFRARED SPECTRAL REGION; INTRINSIC COLOR INDEXES; GALACTIC OPEN CLUSTER; FINAL MASS RELATION; LATE-TYPE STARS; MAIN-SEQUENCE; EVOLVED STARS; CEPHEID VARIABLES; RADIAL-VELOCITIES; RED SUPERGIANTS;
D O I：
10.1088/0004-6256/143/2/46
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present UBV photometry of the highly reddened and poorly studied open cluster Berkeley 55, revealing an important population of B-type stars and several evolved stars of high luminosity. Intermediate-resolution far-red spectra of several candidate members confirm the presence of one F-type supergiant and six late supergiants or bright giants. The brightest blue stars are mid-B giants. Spectroscopic and photometric analyses indicate an age 50 +/- 10 Myr. The cluster is located at a distance d approximate to 4 kpc, consistent with other tracers of the Perseus Arm in this direction. Berkeley 55 is thus a moderately young open cluster with a sizable population of candidate red (super)giant members, which can provide valuable information about the evolution of intermediate-mass stars.
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页数：11
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