Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403l..47d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 403, no. 1, p. L47-L50.
Astronomy and Astrophysics
Astrophysics
11
Astronomical Spectroscopy, Dwarf Stars, M Stars, Absorption Spectra, Stellar Atmospheres, Stellar Models, Stellar Spectra
Scientific paper
We compare the spectroscopic properties of the late M dwarfs VB 8, VB 10, Gl 569B, and LHS 2924 in the 1.5-2.3-micron wavelength interval. Conspicuous star-to-star differences are seen in the strengths of many features, such as the Na I 4530/cm blend and the absorption bands of CO, in marked contrast to the much more subtle differences that are seen shortward of 1 micron. The spectra of the coolest stars, Gl 569B and LHS 2924, are very different from those of VB 8 and VB 10 in that a number of strong unidentified absorption features are present; we speculate that these features may be the signatures of as yet unidentified polyatomic molecules. Despite the uncertainties in the origin of these features, they nevertheless constitute a significant source of opacity, which should be considered in future attempts to model the atmospheres of very cool low-mass objects.
Boeshaar Patricia C.
Davidge Tim J.
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