The Astronomical Journal

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The Astronomical Journal Volume 130 Number 4 Create an alert RSS this journal

John J. Bochanski et al. 2005 The Astronomical Journal 130 1871 doi:10.1086/444417

Spectroscopic Survey of M Dwarfs within 100 Parsecs of the Sun

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John J. Bochanski1, Suzanne L. Hawley1, I. Neill Reid2, Kevin R. Covey1, Andrew A. West1, C. G. Tinney3 and John E. Gizis4

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Abstract References Cited By

We have constructed a sample of M dwarfs out to a distance of ~100 pc. This sample of 605 stars (574 M dwarfs and 31 K dwarfs) have been spectroscopically observed, yielding spectral types, radial velocities, Hα equivalent widths, and molecular band indices. Photometric observations have been compiled, with photographic plates providing RI magnitudes and JHKs magnitudes from Two Micron All Sky Survey observations. Proper motions were determined by a match to USNO-B, and distances were computed employing a spectroscopic parallax, allowing the computation of UVW space motions. These data were used to investigate the distribution of magnetically active stars within the solar neighborhood. We find that there is no statistically significant variation in activity for equidistant locations above and below the Galactic plane. We also confirm prior kinematic analysis of large samples of M dwarfs, finding that active stars form a dynamically colder population.


Keywords

solar neighborhood; stars: late-type; stars: low-mass, brown dwarfs; stars: magnetic fields


Dates

Issue 4 (2005 October)

Received 2005 January 19, accepted for publication 2005 June 8


An Erratum for this article has been published in 2006 The Astronomical Journal 131 3136


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