Issue |
A&A
Volume 381, Number 1, JanuaryI 2002
|
|
---|---|---|
Page(s) | 105 - 121 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011422 | |
Published online | 15 January 2002 |
Rotational velocities of A-type stars*
I. Measurement of
in the southern hemisphere
1
Observatoire de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
2
DASGAL/CNRS UMR 8633, Observatoire de Paris, 5 place Janssen, 92195 Meudon Cedex, France
3
CNRS, Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
4
Université de Paris-Sud XI, 91405 Orsay Cedex, France
5
Dipartimento di Astronomia, Università degli Studi di Trieste, via Tiepolo 11, 34131 Trieste, Italy
Corresponding author: F. Royer, frederic.royer@obs.unige.ch
Received:
24
April
2001
Accepted:
11
October
2001
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 have been collected at
ESO. Fourier transforms of several line profiles in the range
4200–4500 Å are used to derive
from the frequency of
the first zero. Statistical analysis of the sample indicates that
measurement error is a function of
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 [CITE], which
are 10 to 12% lower than our findings. Comparisons with other
independent
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.
Key words: techniques: spectroscopic / stars: early-type / stars: rotation
© ESO, 2002
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