Astron. J., 148, 36 (2014/August-0)
Search for bright nearby M dwarfs with virtual observatory tools.
ABERASTURI M., CABALLERO J.A., MONTESINOS B., GALVEZ-ORTIZ M.C., SOLANO E. and MARTIN E.L.
Abstract (from CDS):
Using Virtual Observatory tools, we cross-matched the Carlsberg Meridian 14 and the 2MASS Point Source catalogs to select candidate nearby bright M dwarfs distributed over ∼25,000 deg2. Here, we present reconnaissance low-resolution optical spectra for 27 candidates that were observed with the Intermediate Dispersion Spectrograph at the 2.5 m Isaac Newton Telescope (ℜ ≈ 1600). We derived spectral types from a new spectral index, ℜ, which measures the ratio of fluxes at 7485-7015 Å and 7120-7150 Å. We also used VOSA, a Virtual Observatory tool for spectral energy distribution fitting, to derive effective temperatures and surface gravities for each candidate. The resulting 27 targets were M dwarfs brighter than J = 10.5 mag, 16 of which were completely new in the Northern hemisphere and 7 of which were located at less than 15 pc. For all of them, we also measured Hα and Na I pseudo-equivalent widths, determined photometric distances, and identified the most active stars. The targets with the weakest sodium absorption, namely, J0422+2439 (with X-ray and strong Hα emissions), J0435+2523, and J0439+2333, are new members in the young Taurus-Auriga star-forming region based on proper motion, spatial distribution, and location in the color-magnitude diagram, which reopens the discussion on the deficit of M2-4 Taurus stars. Finally, based on proper motion diagrams, we report on a new wide M dwarf binary system in the field, LSPM J0326+3929EW.
astronomical databases: miscellaneous - open clusters and associations: individual: Taurus-Auriga - stars: late-type - stars: low-mass - stars: pre-main sequence - virtual observatory tools
Table 2: [ACM2014] JHHMM+DDMM N=27. Paragr. 3.6: Koenigstuhl N (No. 7) added.
Misprints: NLTT 6896 = NLTT 6496 ; G 34-53 = G 34-23 ; J2259+3738 = J2259+3736 ; in Table 5: J1574+2241 = J1547+2241.
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