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M dwarf spectra from 0.6 to 1.5 micron - A spectral sequence, model atmosphere fitting, and the temperature scale
Kirkpatrick, J. D.; Kelly, Douglas M.; Rieke, George H.; Liebert, James; Allard, France; Wehrse, Rainer
AA(Steward Observatory, Tucson, AZ), AB(Steward Observatory, Tucson, AZ), AC(Steward Observatory, Tucson, AZ), AD(Steward Observatory, Tucson, AZ), AE(Heidelberg Univ., Germany), AF(Heidelberg Univ., Germany)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 643-654. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Dwarf Stars, M Stars, Stellar Atmospheres, Stellar Models, Stellar Temperature, Astronomical Spectroscopy, Hertzsprung-Russell Diagram, Stellar Spectra
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Red/infrared (0.6-1.5 micron) spectra are presented for a sequence of well-studied M dwarfs ranging from M2 through M9. A variety of temperature-sensitive features useful for spectral classification are identified. Using these features, the spectral data are compared to recent theoretical models, from which a temperature scale is assigned. The red portion of the model spectra provide reasonably good fits for dwarfs earlier than M6. For layer types, the infrared region provides a more reliable fit to the observations. In each case, the wavelength region used includes the broad peak of the energy distribution. For a given spectral type, the derived temperature sequence assigns higher temperatures than have earlier studies - the difference becoming more pronounced at lower luminosities. The positions of M dwarfs on the H-R diagram are, as a result, in closer agreement with theoretical tracks of the lower main sequence.

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