期刊
ASTRONOMY & ASTROPHYSICS
卷 431, 期 1, 页码 143-148出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041830
关键词
stars : horizontal-branch; Galaxy : halo; Galaxy : kinematics and dynamics; surveys; methods : statistical
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [00/10406-4] Funding Source: FAPESP
We present a sample of 8321 candidate Field Horizontal-Branch (FHB) stars selected by automatic spectral classification in the digital data base of the Hamburg/ESO objective-prism survey. The stars are distributed over 8225 square degrees of the southern sky, at \b\ greater than or similar to 30 deg. The average distance of the sample, assuming that they are all FHB stars, is 9.8 kpc, and distances of up to similar to30 kpc are reached. Moderate-resolution spectroscopic follow-up observations and UBV photometry of 125 test sample stars demonstrate that the contamination of the full candidate sample with main-sequence A-type stars is <16%, while it would be up to 50% in a flux-limited sample at high galactic latitudes. Hence more than similar to 6800 of our FHB candidates are expected to be genuine FHB stars. The candidates are being used as distance probes for high-velocity clouds and for studies of the structure and kinematics of the Galactic halo.
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