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Issue A&A
Volume 446, Number 2, February I 2006
Page(s) 515 - 523
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20054064

A&A 446, 515-523 (2006)
DOI: 10.1051/0004-6361:20054064

Spectroscopic distances of nearby ultracool dwarfs

N. Phan-Bao1 and M. S. Bessell2

1  Institute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 106, Taiwan, R.O.C.
    e-mail: pbngoc@asiaa.sinica.edu.tw
2  Research School of Astronomy and Astrophysics, Australian National University, Cotter Rd, Weston, ACT 2611, Australia

(Received 18 August 2005 / Accepted 29 September 2005 )

Abstract
We present updated results of spectroscopic follow-up observations of a sample of 45 M dwarf candidates identified by Phan-Bao et al. (2003, A&A, 401, 959) based on the DENIS photometry and proper motion measurements. Forty one of these are nearby late-M dwarfs (d<30 pc) with spectral types ranging from M5.0 to M8.5 computed from the spectral indices. One contaminant is probably an F-G main sequence star reddened by intervening dust and three stars that were not observed have previous classifications as M dwarfs in the literature. In this paper, we identify three M7.5, five M8.0, one M8.5 dwarf and confirm two new M8.0 dwarf members of the 25 pc volume.


Key words: stars: low-mass, brown dwarfs

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© ESO 2006


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