Spectroscopic distances of nearby ultracool dwarfs
Astrophysics
2009-11-13 v1
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) 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.
Keywords
Cite
@article{arxiv.astro-ph/0509321,
title = {Spectroscopic distances of nearby ultracool dwarfs},
author = {N. Phan-Bao and M. Bessell},
journal= {arXiv preprint arXiv:astro-ph/0509321},
year = {2009}
}
Comments
9 pages, 5 figures. revised version, submitted to A&A