2002A&A...393..897R -
Astronomy and Astrophysics, volume 393, 897-911 (2002/10-3)
Rotational velocities of A-type stars. II. Measurement of vsini in the northern hemisphere.
ROYER F., GRENIER S., BAYLAC M.-O., GOMEZ A.E. and ZOREC J.
Abstract (from CDS):
This work is the second part of the set of measurements of vsin i for A-type stars, begun by Royer et al. (
2002A&A...381..105R). Spectra of 249 B8 to F2-type stars brighter than V=7 have been collected at Observatoire de Haute-Provence (OHP). Fourier transforms of several line profiles in the range 4200-4600 Å are used to derive vsin i from the frequency of the first zero. Statistical analysis of the sample indicates that measurement error mainly depends on vsin i and this relative error of the rotational velocity is found to be about 5% on average. The systematic shift with respect to standard values from Slettebak et al. (
1975ApJS...29..137S), previously found in the first paper, is here confirmed. Comparisons with data from the literature agree with our findings: vsin i values from Slettebak et al. are underestimated and the relation between both scales follows a linear law vsini
new=1.03vsini
old+7.7. Finally, these data are combined with those from the previous paper (Royer et al.,
2002A&A...381..105R), together with the catalogue of Abt & Morrell (
1995ApJS...99..135A). The resulting sample includes some 2150 stars with homogenized rotational velocities.
Abstract Copyright:
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Journal keyword(s):
techniques: spectroscopic - stars: early-type - stars: rotation
VizieR on-line data:
<Available at CDS (J/A+A/393/897): table5.dat table9.dat>
Simbad objects:
2184
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