Cool zero-metallicity stellar atmospheres

D. Saumon, P. Bergeron, J. I. Lunine, William B. Hubbard, A. Burrows

Research output: Contribution to journalArticle

137 Citations (Scopus)

Abstract

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 mixtures, 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.

Original languageEnglish (US)
Pages (from-to)333-344
Number of pages12
JournalAstrophysical Journal
Volume424
Issue number1
StatePublished - Mar 20 1994

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stellar atmospheres
metallicity
atmospheres
atmosphere
opacity
stars
heavy elements
bears
collision
temperature
diagram
diagrams
grids
collisions
molecules

Keywords

  • Stars: abundances
  • Stars: atmospheres
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Saumon, D., Bergeron, P., Lunine, J. I., Hubbard, W. B., & Burrows, A. (1994). Cool zero-metallicity stellar atmospheres. Astrophysical Journal, 424(1), 333-344.

Cool zero-metallicity stellar atmospheres. / Saumon, D.; Bergeron, P.; Lunine, J. I.; Hubbard, William B.; Burrows, A.

In: Astrophysical Journal, Vol. 424, No. 1, 20.03.1994, p. 333-344.

Research output: Contribution to journalArticle

Saumon, D, Bergeron, P, Lunine, JI, Hubbard, WB & Burrows, A 1994, 'Cool zero-metallicity stellar atmospheres', Astrophysical Journal, vol. 424, no. 1, pp. 333-344.
Saumon D, Bergeron P, Lunine JI, Hubbard WB, Burrows A. Cool zero-metallicity stellar atmospheres. Astrophysical Journal. 1994 Mar 20;424(1):333-344.
Saumon, D. ; Bergeron, P. ; Lunine, J. I. ; Hubbard, William B. ; Burrows, A. / Cool zero-metallicity stellar atmospheres. In: Astrophysical Journal. 1994 ; Vol. 424, No. 1. pp. 333-344.
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