Rotational velocities of A-type stars ?;?? I. Measurement of v sini in the southern hemisphere
Rotational velocities of A-type stars ?;?? I. Measurement of v sini in the southern hemisphere
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DOI：
10.1051/0004-6361:20020943
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发表时间：
2001-10
影响因子：
6.5
通讯作者：
F. Royer;S. Grenier;M. Baylac;A. Gómez;J. Zorec
中科院分区：
文献类型：
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作者：
F. Royer;S. Grenier;M. Baylac;A. Gómez;J. Zorec
在确定HIPPARCOS观测恒星基本参数的关键计划范围内，ESO收集了525颗B8至f2型恒星的光谱，亮度大于V = 8。在4200{4500a范围内的几个行无产阶级的傅里叶变换用于从剩余零的频率推导出vsini。对样品的统计分析表明，测量误差是v sini的函数，转速的相对误差平均约为6%。所得结果与文献数据进行了比较。Slettebak等人（1975）的标准值比我们的结果低10 - 12%，这是一个系统性的转变。与其他独立v sini值的比较倾向于证明Slettebak等人的值被低估了。这种效应归因于Slettebak等人的标准样本中存在双星，以及他们使用的模型大气。
Within the scope of a Key Programme determining fundamental parameters of stars observed by HIPPARCOS, spectra of 525 B8 to F2-type stars brighter than V = 8 have been collected at ESO. Fourier transforms of several line proles in the range 4200{4500 A are used to derive v sini from the frequency of the rst zero. Statistical analysis of the sample indicates that measurement error is a function of v sini and this relative error of the rotational velocity is found to be about 6% on average. The results obtained are compared with data from the literature. There is a systematic shift from standard values from Slettebak et al. (1975), which are 10 to 12% lower than our ndings. Comparisons with other independent v sini values tend to prove that those from Slettebak et al. are underestimated. This eect is attributed to the presence of binaries in the standard sample of Slettebak et al., and to the model atmosphere they used.