New neighbours: IV. 30 DENIS late-M dwarfs between 15 and 30 parsecs

¹ Centre d'Analyse des Images, DASGAL, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
² Observatoire de Paris (DASGAL/UMR-8633), 75014 Paris, France
³ Laboratoire d'Astrophysique de Grenoble, Université J. Fourier, BP 53, 38041 Grenoble, France
⁴ Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA
⁵ Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris
⁶ Observatoire de la Côte d'Azur, Département Fresnel, BP 4229, 06304 Nice Cedex 4, France
⁷ DESPA, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon Cedex, France
⁸ European Southern Observatory, Casilla 19001, Santiago 19, Chile

Corresponding author: N. Phan-Bao, bn.phan@obspm.fr

Received: 16 July 2001
Accepted: 15 October 2001

Abstract

We present 30 new nearby ( 30 pc) red dwarf candidates, with estimated spectral types M 6 to M 8. 26 were directly selected from the DENIS database, and another 4 were first extracted from the LHS catalogue and cross-identified with a DENIS counterpart. Their proper motions were measured on the MAMA measuring machine from plates spanning 13 to 48 years, and are larger than 0.1 yr-1, ruling out the possibility that they are giants. Their distances were estimated from the DENIS colours and IR colour-magnitude relations and range between 15 and 30 pc.