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The Sloan Digital Sky Survey Data Release 7 Spectroscopic M Dwarf Catalog I: Data

  • West, Andrew A.
  • Morgan, Dylan P.
  • Bochanski, John J.
  • Andersen, Jan Marie
  • Bell, Keaton J.
  • Kowalski, Adam F.
  • Davenport, James R. A.
  • Hawley, Suzanne L.
  • Schmidt, Sarah J.
  • Bernat, David
  • Hilton, Eric J.
  • Muirhead, Philip
  • Covey, Kevin R.
  • Rojas-Ayala, Barbara
  • Schlawin, Everett
  • Gooding, Mary
  • Schluns, Kyle
  • Dhital, Saurav
  • Pineda, J. Sebastian
  • Jones, David O.
Publication Date
Jan 20, 2011
Submission Date
Jan 05, 2011
DOI: 10.1088/0004-6256/141/3/97
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We present a spectroscopic catalog of 70,841 visually inspected M dwarfs from the seventh data release of the Sloan Digital Sky Survey (SDSS). For each spectrum, we provide measurements of the spectral type, a number of molecular bandheads, and the H-alpha, H-beta, H-gamma, H-delta and Ca II K emission lines. In addition, we calculate the metallicity-sensitive parameter zeta and identify a relationship between zeta and the g-r and r-z colors of M dwarfs. We assess the precision of our spectral types (which were assigned by individual examination), review the bulk attributes of the sample, and examine the magnetic activity properties of M dwarfs, in particular those traced by the higher order Balmer transitions. Our catalog is cross-matched to Two Micron All Sky Survey (2MASS) infrared data, and contains photometric distances for each star. Lastly, we identify eight new late-type M dwarfs that are possibly within 25 pc of the Sun. Future studies will use these data to thoroughly examine magnetic activity and kinematics in late-type M dwarfs and examine the chemical and dynamical history of the local Milky Way.

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