Cool zero-metallicity stellar atmospheres

Details Cool zero-metallicity stellar atmospheres Cool zero-metallicity stellar atmospheres

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..333s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 1, p. 333-344

Astronomy and Astrophysics

Astrophysics

137

Astronomical Models, Brown Dwarf Stars, Convective Heat Transfer, Cool Stars, Metallicity, Radiative Heat Transfer, Stellar Atmospheres, Hertzsprung-Russell Diagram, Opacity

Scientific paper

Very low mass stars and brown dwarfs have low effective temperatures and their atmospheric opacities are provided by heavy elements which form a host of strongly absorbing molecules. We present a study of the atmospheres and emergent spectra of these objects in the limiting case of zero metallicity. A grid of atmosphere models is presented, based on updated opacities for H/He mixtues, in particular for the collision-induced absorption by H2 which plays an important role in these atmospheres. The emergent spectra bear little resemblance to the corresponding blackbody emission and become bluer as the effective temperature is lowered. The atmosphere models are coupled with interior calculations to obtain accurate physical and photometric characteristics for the low-mass end of the zero-metallicity main sequence. This provides a useful boundary in the Hertzsprung-Russel diagram to interpret observations of low-metallicity stars.

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