The CdC2000 Bordeaux Carte du Ciel catalogue ()

¹ Observatoire Aquitain des Sciences de l'Univers, CNRS-UMR 5804, BP 89, 33270 Floirac, France e-mail: ducourant@obs.u-bordeaux1.fr
² Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitária, 05508-900 São Paulo, SP, Brazil
³ Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
⁴ Astronomy Survey Unit, Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA, UK
⁵ Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, BP 4229, 06304 Nice Cedex 4, France

Received: 14 September 2005
Accepted: 11 November 2005

Abstract

Context.This work is part of a program of proper motion measurements in the Bordeaux Carte du Ciel zone.Aims.We present the CdC2000 catalogue issued from the reduction of the complete Bordeaux Carte du Ciel zone observed at the begining of last century with the Bordeaux astrograph.Methods.Plates have been individually reduced using the TYCHO-2 Catalogue as the astrometric reference. Results.This catalogue is a positional catalogue of 344 781 stars covering the declination zone . The average epoch of positions is 1914.7. The data are from the 512 Carte du Ciel plates archived at the Bordeaux Observatory and scanned with the APM Cambridge automatic measuring machine. Astrometric standard errors are about 0.10″ to 0.12″ on positions and 0.6 mag on photographic magnitudes. Conclusions.A detailed study of errors and a comparison of various reduction methods are presented in order to take into account the significant propagated errors from the reference catalogue. The CdC2000 provides positions at the epoch of the plates for 50 682 TYCHO-2 stars. The associated positions are proved to be more precise than the positions given by the TYCHO-2 catalogue at the epoch of the plates (0.11″ instead of 0.15″). This work is part of a program of proper motion measurements in the Bordeaux Carte du Ciel zone.