New DENIS nearby L and late-M dwarfs (Phan-Bao+, 2008)

Details New DENIS nearby L and late-M dwarfs (Phan-Bao+, 2008) New DENIS nearby L and late-M dwarfs (Phan-Bao+, 2008)

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..83830831p&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/383/831. Originally published in: 2008MNRAS.383..831P

Physics

Stars: Nearby, Stars: M-Type, Photometry: Infrared, Stars: Distances, Proper Motions

Scientific paper

We report on new nearby L and late-M dwarfs (dphot< discovered in our search for nearby ultracool dwarfs (I-J>=3.0, later than M8.0) in the Galactic plane (|b|<15{deg}) over 4800 deg2 in the Deep Near Infrared Survey of t he Southern Sky (DENIS) data base. We used late-M (>=M8.0), L and T dwarfs with accurate trigonometric parallaxes to calibrate the MJ versus I-J colour-luminosity relation. The resulting photometric distances have standard errors of ~15 per cent, which we used to select candidates dphot <=30pc. We measured proper motions from multi-epoch images found in the public archives ALADIN, DSS, 2MASS and DENIS, with at least three distinct epochs and time baselines of 10-21yr. We then used the Maximum Reduced Proper Motion method to select 28 candidates as ultracool dwarfs (M8.0-L8.0) and to reject one as a distant red star. Our low-resolution optical spectra confirmed that 26 were indeed ultracool dwarfs, with spectral types from M8.0 to L5.5. Two contaminants and one rejected by the maximum reduced proper motion cut-off were all reddened F-K main sequence stars. 20 of these 26 ultracool dwarfs are new nearby ultracool dwarf members, three L dwarfs within 15pc with one L3.5 at only ~10pc.
(1 data file).

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