Identification of RR Lyrae stars in the Tycho-2 catalogue
Université de Montpellier II and CNRS, G.R.A.A.L., cc072, 34095 Montpellier Cedex 5, France
2 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Avda. Diagonal 647, 8028 Barcelona, Spain
Corresponding author: M. O. Mennessier, firstname.lastname@example.org
Accepted: 30 April 2002
The Tycho-2 catalogue provides astrometric and photometric data for the 2.5 million brightest stars in the sky. Therefore it can provide much larger samples than the Hipparcos samples used to date in statistical studies. The object of this paper is the cross-identification of Tycho-2 sources and known variable stars of RR Lyrae type. The Tycho-2 data of cross-identified sources are added into the ASTRID specialized database. The present selection almost doubles the size of the sample of RR Lyrae stars with available proper motions.
Key words: stars: variables: RR Lyr / catalogs
© ESO, 2002