Spectral Classifications for 212 Little-Studied K and M Dwarfs in the LHS Catalogue

Details Spectral Classifications for 212 Little-Studied K and M Dwarfs in the LHS Catalogue Spectral Classifications for 212 Little-Studied K and M Dwarfs in the LHS Catalogue

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542419w&link_type=abstract

American Astronomical Society, AAS Meeting #215, #424.19; Bulletin of the American Astronomical Society, Vol. 42, p.333

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained two-dimensional spectral classifications for 212 stars listed in the LHS Catalogue (Luyten 1979). Stars selected for our observing program have southern declinations, red colors, and in most cases only color-equivalent types (k or m) in the Catalogue. The observations were originally motivated by the hope of finding dwarf carbon stars; since LHS stars by definition have proper motions exceeding 0.5 arcsec/yr, any relatively faint LHS star displaying a C-type spectrum would necessarily be dC.
Observations were acquired at the CTIO 1.0-m telescope during the period 1993-95. Our data consist of narrow-band photoelectric TiO/CN photometry using the first 6 filters of Wing's eight-color system. Temperature classes are based on the strength of the strong TiO band near 7120 A; they are given to a tenth of a subtype and are on the same scale as we use for giant stars, tied to the MK scale through observations of Keenan giant standards. Our luminosity criterion is CN absorption measured at 8120 A; this feature is invariably present in giants and supergiants but is absent (depression less than 0.03 mag) in K and M dwarfs. We do not distinguish subdwarfs from main-sequence dwarfs.
No new dC stars were found; 189 of the program stars were found to have measurable TiO absorption indicating spectral types ranging from K3.5 V to M6.5 V. In addition, 23 stars have too little TiO to be classified by this method but have colors consistent with being early K dwarfs.

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