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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, Bárbara; Schlawin, Everett; Gooding, Mary; Schluns, Kyle; Dhital, Saurav; Pineda, J. Sebastian; Jones, David O
The Astronomical journal, 03/2011, Volume: 141, Issue: 3Journal Article
We present a spectroscopic catalog of 70,841 visually inspected M dwarfs from the seventh data release of the Sloan Digital Sky Survey. For each spectrum, we provide measurements of the spectral type, a number of molecular band heads, and the H Delta *a, H Delta *b, H Delta *g, H Delta *d, and Ca II K emission lines. In addition, we calculate the metallicity-sensitive parameter Delta *z and identify a relationship between Delta *z 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 infrared data, and contains photometric distances for each star. Finally, 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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