Title

New Neighbours Vi. Spectroscopy Of Denis Nearby Stars Candidates

Keywords

Solar neighbourhood; Stars: distances; Stars: fundamental parameters; Stars: low-mass, brown dwarfs

Abstract

We present spectra of 36 nearby star candidates and 3 red giant candidates, identified in the DENIS database. 32 of the dwarf candidates are nearby red dwarfs, with spectral types from M 5.5 to M 8.5. Out of 11 targets with low proper motion (μ < 0.1 arcsec yr-1) but a Reduced Proper Motion above an inclusive threshold, 9 are red dwarfs. The 4 contaminants are all reddened F-K main sequence stars, and could have been eliminated by checking for small well-known high latitude molecular clouds. These stars might be of interest as probes of interstellar absorption. For the red dwarfs we derive spectral types and spectroscopic distances, using a new calibration of the PC3 spectral index to absolute magnitudes in the I, J, H and K photometric bands. We confirm 2 new members of the 12 pc volume (2 new M 8.5), and one M 7.5 NLTT object closer than 10 pc; and show that one quarter of the stars with photometric distances under 30 pc have too small a proper motion for inclusion in the NLTT catalog. © ESO 2005.

Publication Date

10-1-2005

Publication Title

Astronomy and Astrophysics

Volume

441

Issue

2

Number of Pages

653-661

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1051/0004-6361:20052998

Socpus ID

26244453289 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/26244453289

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