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Title: Search for bright nearby M dwarfs with virtual observatory tools

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{sup 2}. 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 onmore » 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.« less

Authors:
; ; ; ; ;  [1]
  1. Centro de Astrobiología (CSIC-INTA), Departamento de Astrofísica, P.O. Box 78, E-28691 Villanueva de la Cañada, Madrid (Spain)
Publication Date:
OSTI Identifier:
22342279
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; CATALOGS; COLOR; DISPERSIONS; EMISSION; ENERGY SPECTRA; GRAVITATION; MASS; NORTHERN HEMISPHERE; POINT SOURCES; PROPER MOTION; RESOLUTION; SPATIAL DISTRIBUTION; STARS; SURFACES; TELESCOPES; X RADIATION

Citation Formats

Aberasturi, M., Caballero, J. A., Montesinos, B., Gálvez-Ortiz, M. C., Solano, E., and Martín, E. L. Search for bright nearby M dwarfs with virtual observatory tools. United States: N. p., 2014. Web. doi:10.1088/0004-6256/148/2/36.
Aberasturi, M., Caballero, J. A., Montesinos, B., Gálvez-Ortiz, M. C., Solano, E., & Martín, E. L. Search for bright nearby M dwarfs with virtual observatory tools. United States. doi:10.1088/0004-6256/148/2/36.
Aberasturi, M., Caballero, J. A., Montesinos, B., Gálvez-Ortiz, M. C., Solano, E., and Martín, E. L. Fri . "Search for bright nearby M dwarfs with virtual observatory tools". United States. doi:10.1088/0004-6256/148/2/36.
@article{osti_22342279,
title = {Search for bright nearby M dwarfs with virtual observatory tools},
author = {Aberasturi, M. and Caballero, J. A. and Montesinos, B. and Gálvez-Ortiz, M. C. and Solano, E. and Martín, E. L.},
abstractNote = {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{sup 2}. 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.},
doi = {10.1088/0004-6256/148/2/36},
journal = {Astronomical Journal (New York, N.Y. Online)},
number = 2,
volume = 148,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}