Asteroseismology of Procyon: Preliminary results from SARG

Third Coast Pub Date : 2004-06-01 DOI:10.1553/CIA145S51
R. Claudi, A. Bonanno, R. Ventura, G. Bonanno, R. Cosentino, S. Desidera, R. Gratton, S. Scuderi, M. Endl
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引用次数: 0

Abstract

The F5 IV-V subgiant Procyon was observed over 6 nights with SARG at TNG. We took sequences of 10 s exposures with an average dead time in between of 127 s. In total, 956 spectra were collected with a typical signal-to-noise ratio ranging between 250-330. Data reduction was performed using IRAF tasks devoted to echelle spectra. Successively the modelling of the star plus iodine absorption spectra was performed by using AUSTRAL code (Endl et al. 2000, A&A, 362, 585) in order to obtain the radial velocities time series. The Scargle and Lomb modified periodogram (Lomb 1976, Ap&SS, 39, 447, Scargle 1982, ApJ, 263, 835) shows two prominent frequencies: ν1 = 0.2346 mHz and ν2 = 0.8387 mHz both with a significance level greater than 99% . Frequency ν2 corresponds to the 20 min period found by Brown et al. (1991 ApJ, 368, 599).
Procyon的星震学:来自SARG的初步结果
在TNG上用SARG观察了6个晚上的F5 IV-V亚巨原。我们拍摄了10秒的曝光序列,平均死光时间在127秒之间。总共收集了956个光谱,典型的信噪比在250-330之间。使用专门用于梯级光谱的IRAF任务进行数据缩减。随后利用AUSTRAL代码(Endl et al. 2000, A&A, 362,585)对恒星加碘吸收光谱进行建模,得到径向速度时间序列。Scargle和Lomb修正周期图(Lomb 1976, Ap&SS, 39,447, Scargle 1982, ApJ, 263,835)显示两个突出频率:ν1 = 0.2346 mHz和ν2 = 0.8387 mHz,显著性水平均大于99%。频率ν2对应于Brown et al. (1991 ApJ, 368,599)发现的20分钟周期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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