Astron. Astrophys. 333, 882-892 (1998)

Wide field search for nearby faint stars ^*

C. Ducourant ¹, B. Dauphole ¹, M. Rapaport ¹, J. Colin ¹ and M. Geffert <sup>2

1</sup> Observatoire de Bordeaux, URA 352, CNRS/INSU, BP 89, F-33270 Floirac, France
² Sternwarte der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany

Received 2 June 1997 / Accepted 28 January 1998

Abstract

A project to search for nearby stars in a wide field using Schmidt plates is presented. A field intensively observed allowed us to select a list of nearby stars candidates. CCD astrometry of 20 of these, acquired at the 1.23m telescope of Calar Alto is presented. Trigonometric parallaxes and proper motions have been determined. We confirm for six of our targets that they are nearby stars with distances smaller than 40 parsecs from the Sun (smaller than 20 parsecs for three of them) and with relative errors smaller than 20 percent. One of these appears to be a bright () large proper motions star () not mentioned in the NLTT catalog and absent from CDS data base.

Key words: astrometry stars: distances stars: low mass, brown dwarfs solar neighbourhood

* Based on observations made at Cerga Schmidt telescope, Tautenburg Schmidt telescope, Calar-Alto Schmidt telescope, Calar-Alto telescope and Telescope Bernard Lyot at Pic du Midi. Based on measurements made at MAMA automatic measuring machine

Send offprint requests to: C. Ducourant

© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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