Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-22
Astronomy and Astrophysics
Astrophysics
17 pages, includes 18 figures, accepted in A&A
Scientific paper
10.1051/0004-6361:20011422
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 profiles in the range 4200-4500 A are used to derive vsini from the frequency of the first zero. Statistical analysis of the sample indicates that measurement error is a function of vsini 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 findings. Comparisons with other independent vsini values tend to prove that those from Slettebak et al. are underestimated. This effect is attributed to the presence of binaries in the standard sample of Slettebak et al., and to the model atmosphere they used.
Faraggiana Rosanna
Gerbaldi Michèle
Gomez Ana E.
Royer Fr.
No associations
LandOfFree
Rotational velocities of A-type stars I. Measurement of vsini in the southern hemisphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Rotational velocities of A-type stars I. Measurement of vsini in the southern hemisphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotational velocities of A-type stars I. Measurement of vsini in the southern hemisphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-232959