A grid of non-LTE line-blanketed model atmospheres of O-type stars

Thierry Lanz, Ivan Hubeny

Research output: Contribution to journalArticlepeer-review

529 Scopus citations


We have constructed a comprehensive grid of 680 metal line-blanketed, non-LTE, plane-parallel, hydrostatic model atmospheres for the basic parameters appropriate to O-type stars. The OSTAR2002 grid considers 12 values of effective temperatures, 27,500 K ≤ Teff ≤ 55,000 K with 2500 K steps, eight surface gravities, 3.0 ≤ log g ≤ 4.75 with 0.25 dex steps, and 10 chemical compositions, from metal-rich relative to the Sun to metal-free. The lower limit of log g for a given effective temperature is set by an approximate location of the Eddington limit. The selected chemical compositions have been chosen to cover a number of typical environments of massive stars: the Galactic center, the Magellanic Clouds, blue compact dwarf galaxies like I Zw 18, and galaxies at high redshifts. The paper contains a description of the OSTAR2002 grid and some illustrative examples and comparisons. The complete OSTAR2002 grid is available on-line.

Original languageEnglish (US)
Pages (from-to)417-441
Number of pages25
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Jun 2003
Externally publishedYes


  • Methods: numerical
  • Radiative transfer
  • Stars: atmospheres
  • Stars: early-type

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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