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• W1978892415 endingPage "36" @default.
• W1978892415 startingPage "36" @default.
• W1978892415 abstract "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 deg^2. Here, we present reconnaissance low-resolution optical spectra for 27 candidates that were observed with the Intermediate Dispersion Spectrograph at the 2.5m Isaac Newton Telescope (R ~ 1600). We derived spectral types from a new spectral index, R, which measures the ratio of fluxes at 7485-7015 A and 7120-7150 A. 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 H{alpha} 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 H{alpha} 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." @default.
• W1978892415 created "2016-06-24" @default.
• W1978892415 creator A5006011475 @default.
• W1978892415 creator A5027977555 @default.
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• W1978892415 creator A5076031428 @default.
• W1978892415 creator A5088865970 @default.
• W1978892415 creator A5089861054 @default.
• W1978892415 date "2014-07-16" @default.
• W1978892415 modified "2023-10-16" @default.
• W1978892415 title "SEARCH FOR BRIGHT NEARBY M DWARFS WITH VIRTUAL OBSERVATORY TOOLS" @default.
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