A catalog of rotational and radial velocities for evolved stars. IV. Metal-poor stars ⋆,⋆⋆
A catalog of rotational and radial velocities for evolved stars. IV. Metal-poor stars ⋆,⋆⋆
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DOI：
10.1051/0004-6361:20065642
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发表时间：
2006-08
影响因子：
6.5
通讯作者：
J. D. Medeiros;J. R. P. Silva;J. D. D. Nascimento-J.-D.-D.-Nascimento-2248203267;B. C. Martins;L. D. Silva;C. Melo;M. Burnet
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文献类型：
--
作者：
J. D. Medeiros;J. R. P. Silva;J. D. D. Nascimento-J.-D.-D.-Nascimento-2248203267;B. C. Martins;L. D. Silva;C. Melo;M. Burnet
目标。本文件描述的第一个观测计划的结果，旨在完善和扩展现有的v \sin i\$测量的贫金属恒星，重点是场演化的恒星。方法.调查是用FEROS和CORALIE光谱仪进行的。对于$v \sin i$测量，从光谱合成，我们估计约2.0 ${\rm km\，s}^{-1}$的不确定性。结果精确的旋转速度${v\sin i}$提出了一个大样本的100个贫金属恒星，其中大部分演变的主序星。对于构成本样本的绝大多数恒星，旋转速度是第一次测量。
Aims. The present paper describes the first results of an observational program intended to refine and extend the existing $v \sin i$ measurements of metal-poor stars, with an emphasis on field evolved stars. Methods. The survey was carried out with the FEROS and CORALIE spectrometers. For the $v \sin i$ measurements, obtained from spectral synthesis, we estimate an uncertainty of about 2.0 ${\rm km\,s}^{-1}$. Results. Precise rotational velocities ${v\sin i}$ are presented for a large sample of 100 metal-poor stars, most of them evolving off the main–sequence. For the large majority of the stars composing the present sample, rotational velocities have been measured for the first time.