Astronomy and Astrophysics Supplement Series, Vol. 118, September 1996, 545-555
Rotational velocities of F dwarfs; application of the Fourier-Bessel transformation method
P.J. Groot , A.J.M. Piters and J. van Paradijs
Astronomical Institute `Anton Pannekoek'/ CHEAF, Kruislaan 403,
1098 SJ, Amsterdam, The Netherlands
Physics Department, UAH, Huntsville, AL 35899, U.S.A.
Received November 22, 1994; accepted January 30, 1996
Abstract:Projected rotational velocities are presented for 178 bright dwarf stars (V<7) with spectral types in the range A8 till G2. These rotational velocities have been determined by Fourier-Bessel transformation of the line profiles of six Fe I absorption lines in a 50 Å wide range centered on 6250 Å. Rotational velocities of stars with suspected velocities of more than 40 km/s were also determined by fitting the whole spectral range with a profile of a slowly rotating star of the same spectral type that has been convolved with a rotation profile. The agreement between the results obtained with these two methods is very good.
Key words: line: profiles --- stars: rotation --- techniques: spectroscopic