EDP Sciences
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Volume 390, Number 1, July IV 2002
Page(s) 173 - 178
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020714

A&A 390, 173-178 (2002)
DOI: 10.1051/0004-6361:20020714

Identification of RR Lyrae stars in the Tycho-2 catalogue

M. O. Mennessier1 and J. Colomé2

1  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

(Received 1 February 2002 / 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

Offprint request: M. O. Mennessier, menes@graal.univ-montp2.fr

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