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M dwarf spectra from 0.6 to 1.5 micron - A spectral sequence, model atmosphere fitting, and the temperature scaleRed/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.
Document ID
19930037606
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kirkpatrick, J. D.
(NASA Headquarters Washington, DC United States)
Kelly, Douglas M.
(NASA Headquarters Washington, DC United States)
Rieke, George H.
(NASA Headquarters Washington, DC United States)
Liebert, James
(Steward Observatory Tucson, AZ, United States)
Allard, France
(NASA Headquarters Washington, DC United States)
Wehrse, Rainer
(Heidelberg Univ. Germany)
Date Acquired
August 16, 2013
Publication Date
January 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 402
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A21603
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-45162
Distribution Limits
Public
Copyright
Other

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