J/A+A/381/105 Rotational velocities of A-type stars. I. (Royer+, 2002)
Rotational velocities of A-type stars.
I. Measurement of vsini in the southern hemisphere.
Royer F., Gerbaldi M., Faraggiana R., Gomez A.E.
<Astron. Astrophys., 381, 105 (2002)>
=2002A&A...381..105R 2002A&A...381..105R
ADC_Keywords: Stars, early-type ; Stars, A-type ; Rotational velocities ;
Velocity dispersion
Keywords: techniques: spectroscopic - stars: early-type - stars: rotation
Abstract:
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 4200-4500Å 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
Slk75, which are 10 to 12% lower than our findings. Comparisons with
other independent vsini values tend to prove that those from Slettebak
et al. (1975ApJS...29..137S 1975ApJS...29..137S) are underestimated. This effect is
attributed to the presence of binaries in the standard sample of
Slettebak et al. (1975ApJS...29..137S 1975ApJS...29..137S), and to the model atmosphere
they used.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 40 525 Results of the vsini measurements
--------------------------------------------------------------------------------
See also:
III/226 : Rotational Velocities of Stars (Glebocki+ 2000)
J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998)
J/A+AS/126/21 : Velocities and duplicity of F-type dwarfs (Nordstroem+ 1997)
J/A+AS/139/433 : RV and vsini of evolved stars (de Medeiros+ 1999)
J/MNRAS/284/265 : Rotational Velocities of 373 OB stars (Howarth+ 1997)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD number
8- 13 I6 --- HIP ? HIP number
15- 25 A11 --- SpType MK Spectral type
27- 29 I3 km/s vsini vsini
30 A1 --- u_vsini Uncertainty flag on vsini
32- 33 I2 km/s sigma ? Standard deviation associated to vsini
35- 37 I3 --- o_vsini Number of measured lines
39- 40 A2 --- Remark See Note (1)
--------------------------------------------------------------------------------
Note (1): Remarks:
SB: double line spectral binary star
SH: shell star
NO: uncertain vsini, no selected lines
SS: uncertain vsini, variable from spectrum to spectrum
LL: uncertain vsini, variable from line to line
--------------------------------------------------------------------------------
Acknowledgements: Frederick Royer
(End) PAtricia Bauer [CDS] 18-Dec-2001