Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..413j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 267, no. 2, p. 413-423
Astronomy and Astrophysics
Astronomy
126
Absorption Spectra, Brown Dwarf Stars, Infrared Spectra, M Stars, Stellar Atmospheres, Stellar Temperature, Astronomical Models, Spectrum Analysis, Stellar Evolution, Stellar Luminosity, Stellar Mass
Scientific paper
We present a spectral sequence from 1 to 2.5 microns of M dwarfs, from GL411 (M2V) to the best brown dwarf candidate GD165B which is classified as cooler than M9V. This sequence shows the progressive importance of water absorption in the atmospheres of M dwarfs. We take the strength of the water absorption bands as the basis of a new method to derive a temperature from which we calculate effective temperatures and radii. We also identify many of the stronger atomic and molecular features and correlate their strengths with our derived temperature scale. For a given luminosity, this method yields temperatures close to those predicted by evolutionary models for low-mass stars, but not always close to those found by previous investigators. We find that GD165B has a temperature of 1860 +/- 160 K and that it is the only star in the sample that might be classified as a brown dwarf, but to decide its true nature a more accurate parallax and a representative model atmosphere will be necessary.
Jameson Richard F.
Jones Hugh R. A.
Longmore Andrew J.
Mountain Charles M.
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