APPARENTLY NORMAL, HIGH-LATITUDE B-STARS FROM THE EDINBURGH-CAPE SURVEY .2.

被引:22
作者
KILKENNY, D
LUVHIMBI, E
ODONOGHUE, D
STOBIE, RS
KOEN, C
CHEN, A
机构
[1] UNIV VENDA,DEPT PHYS,THOHOYANDOU,SOUTH AFRICA
[2] UNIV CAPE TOWN,DEPT ASTRON,RONDEBOSCH 7700,SOUTH AFRICA
关键词
SURVEYS; STARS; EARLY-TYPE; HORIZONTAL BRANCH; SUBDWARFS; GALAXY; HALO;
D O I
10.1093/mnras/276.3.906
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Low-dispersion spectrograms and UBV photometry are used to carry out a simple analysis of a second sample of apparently normal, high galactic latitude B stars detected in the Edinburgh-Cape faint blue object survey. The sample is bigger than that in Paper I and contains more faint stars. Of the 30 stars, eight are classified as 'weak-line' stars and appear very similar to stars in the blue horizontal branch of globular clusters. A further eight stars are sdB stars (including two possible binaries), and 11 stars appear to be normal B stars. Nine of these have distances from the Galactic plane in the approximate range 1 less than or equal to z less than or equal to 4 kpc, and two are probably much more distant. These results, and those of Paper I, indicate that B stars at large distances from the Galactic plane (z > 5 kpc) must be very rare. Three stars do not fall into obvious categories; two of them are helium-rich and all may be hot subdwarfs.
引用
收藏
页码:906 / 914
页数:9
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