Observatoire de Marseille, 2 place Le Verrier, F-13248 Marseille
Cedex 04, France
We present radial velocity data for 22 galactic Cepheid stars obtained with
Coravel
spectrometer. Continuous observation over several years has enabled us to obtain 852 individual
velocities covering all the phases of the pulsation. The mean
number of measurements per star is 39, ranging from 20 to 113. For each star radial velocity versus
phase diagrams have been fitted by analytical relation, and
the stellar radius variation has been derived by integration of this relation over the whole period.
Using recent
ubv photometry of the literature and
velocity curves, we have calculated the radii of the stars using a method based on the
Baade-Wesselink concept. For these 22 Cepheids we give a
linear logarithmic period-radius relation with a range of 2,4 to 45 days.
Key words: stars:
cepheids -- stars: fundamental parameters -- techniques: radial velocities
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