The stellar content of the Hamburg/ESO survey - II. A large, homogeneously-selected sample of high latitude carbon stars

被引:130
作者
Christlieb, N
Green, PJ
Wisotzki, L
Reimers, D
机构
[1] Univ Hamburg, Hamburger Sternwarte, D-21029 Hamburg, Germany
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02140 USA
[3] Univ Potsdam, Inst Phys, D-14469 Potsdam, Germany
来源
ASTRONOMY & ASTROPHYSICS | 2001年 / 375卷 / 02期
关键词
stars : carbon; surveys; Galaxy : halo;
D O I
10.1051/0004-6361:20010814
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a sample of 403 faint high latitude carbon (FHLC) stars selected from the digitized objective prism plates of the Hamburg/ESO Survey (HES). Because of the similar to 15 Angstrom spectral resolution and high signal-to-noise ratio of the HES prism spectra, our automated procedure based on the detection of C-2 and CN molecular bands permits high-confidence identification of carbon stars without the need for follow-up spectroscopy. From a set of 329 plates (87% of the survey), covering 6 400 deg(2) to a magnitude limit of V similar to 16.5, we analyze the selection efficiency and effective surface area of the HES FHLC survey to date. The surface density of FHLC stars that we detect (0.072 +/- 0.005 deg(-2)) is 2-4 times higher than that of previous objective prism and CCD surveys at high galactic latitude, even though those surveys claimed a limiting magnitude up to 1.5 magnitudes fainter. This attests to the highest selection sensitivity yet achieved for these types of stars.
引用
收藏
页码:366 / 374
页数:9
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