The "lithium test" and the spectra of late M dwarfs and brown dwarfs: Condensation effects

Details The "lithium test" and the spectra of late M dwarfs and brown dwarfs: Condensation effects The "lithium test" and the spectra of late M dwarfs and brown dwarfs: Condensation effects

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..787p&link_type=abstract

Astronomy Reports, Volume 42, Issue 6, November 1998, pp.787-792

Astronomy and Astrophysics

Astronomy

10

Scientific paper

A system of ionization-dissociation equilibrium equations for model atmospheres for late M dwarfs are solved, and spectra of late M dwarfs and brown dwarfs are calculated in the region of lithium resonance lines, taking into account the decrease of the TiO concentration due to condensation. In the context of the approach adopted, the TiO partial pressure could not exceed the saturation pressure. It was found that (1) in the outer atmospheres of late M dwarfs and brown dwarfs with T_eff ~ 1000 K, TiO molecules are oversaturated; (2)in these regions, the TiO density is substantially reduced due to condensation (for T_eff ~ 1000 K and lg g = 5.0), which reduces the intensity of the TiO bands in the spectra of M dwarfs; (3) in the atmospheres of late M dwarfs, lithium-containing molecules are obviously undersaturated; (4) the `lithium test' is quite applicable for T_eff <~ 1000 K, and even for lower temperatures.

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