THE SLOAN DIGITAL SKY SURVEY DATA RELEASE 7 SPECTROSCOPIC M DWARF CATALOG. I. DATA

2011/01/20 by Andrew A. West, Dylan P. Morgan, John J. Bochanski +21 · 317 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Balmer series #Brown dwarf #Emission spectrum #Metallicity #Milky Way #Physics #Sky #Spectral line #Stars #Stellar classification #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.1088/0004-6256/141/3/97

published in The Astronomical Journal 141(3), 97 (Institute of Physics) · 14 pages, 10 figures, 5 tables (in emulateapj format), accepted for publication in the Astronomical Journal

arxiv created 2011/01/20 · openalex publication_date 2011/02/10 · arxiv updated 2015/05/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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 Hα, Hβ, Hγ, Hδ, and Ca ii K emission lines. In addition, we calculate the metallicity-sensitive parameter ζ and identify a relationship between ζ 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.

Citations

• JHKLM photometry - Standard systems, passbands, and intrinsic colors

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