We dedicate this paper to the memory of our great friend and observer in the field of Sct stars Salvador F. González-Bedolla deceased November 1, 1996. This research was supported by the Junta de Andalucía, the Dirección General de Investigación Científica y Técnica (DGICYT) under project PB93-0134. This research has made use of the Simbad database, operated at CDS, Strasbourg, France. Acknowledgements are also especially made to M.C. Romero for making available a lot of papers used in this investigation and to V.G. Brown for proofreading.
© European Southern Observatory (ESO) 1998
Online publication: February 4, 1998