Spectroscopic distances of nearby ultracool dwarfs

Details Spectroscopic distances of nearby ultracool dwarfs Spectroscopic distances of nearby ultracool dwarfs

2005-09-13

arxiv.org/abs/astro-ph/0509321v1

Astron.Astrophys.446:515-523,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures. revised version, submitted to A&A

Scientific paper

10.1051/0004-6361:20054064

We present updated results of spectroscopic follow-up observations of a sample of 45 M dwarf candidates identified by Phan-Bao et al. (2003) 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.

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