Search for bright nearby M dwarfs with Virtual Observatory tools
arXiv:1408.1611 · doi:10.1088/0004-6256/148/2/36
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 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.
References in corpus (11)
- Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
- VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
- Large-scale magnetic topologies of late M dwarfs
- The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)
- A Survey for New Members of Taurus with the Spitzer Space Telescope
- A Large-Area Search for Low Mass Objects in Upper Scorpius I: The Photometric Campaign and New Brown Dwarfs
- A kinematic study of the Taurus-Auriga T association
- A Distributed Population of Low Mass Pre-Main Sequence Stars near the Taurus Molecular Clouds
- Contamination by field late-M, L and T dwarfs in deep surveys
- Southern wide very low-mass stars and brown dwarfs in resolved binary and multiple systems
- An IPHAS-based search for accreting very low-mass objects using VO tools