Radial velocities of Hipparcos southern B8-F2 type stars

被引:53
作者
Grenier, S
Burnage, R [1 ]
Faraggiana, R
Gerbaldi, M
Delmas, F
Gómez, AE
Sabas, V
Sharif, L
机构
[1] Observ Haute Provence, UPR 9049 CNRS, F-04870 St Michel, France
[2] Observ Paris, DASGAL, URA 335 CNRS, F-92195 Meudon, France
[3] Dipartimento Astron, I-34131 Trieste, Italy
[4] CNRS, Inst Astrophys, F-75014 Paris, France
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 1999年 / 135卷 / 03期
关键词
techniques : spectroscopic; stars : early-type; stars : fundamental parameters; binaries : spectroscopic;
D O I
10.1051/aas:1999186
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Radial velocities have been determined for a sample of B8-F2 type stars observed by the Hipparcos satellite. Observations were obtained within the framework of an ESO key-program. Radial velocities have been measured using a cross-correlation method, the templates being a grid of synthetic spectra. The obtained precision depends on effective temperature and projected rotational velocity of the star as well as on a possible asymmetry of the correlation peak generally due to secondary components. New spectroscopic binaries have been detected from these asymmetries and the variability of the measured radial velocity. Simulations of binary and triple systems have been performed. For binaries our results have been compared with Hipparcos binary data. Adding the variable radial velocities, the minimum binary fraction has been found 60% for physical systems. Radial velocities have been determined for 581 B8-F2 stars, 159 being new. Taking into account published radial velocities, 39% south A-type stars with V magnitude lower than 7.5 have a radial velocity.
引用
收藏
页码:503 / 509
页数:7
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