Abstract
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 language | English (US) |
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Pages (from-to) | 417-441 |
Number of pages | 25 |
Journal | Astrophysical Journal, Supplement Series |
Volume | 146 |
Issue number | 2 |
DOIs | |
State | Published - Jun 2003 |
Externally published | Yes |
Keywords
- Methods: numerical
- Radiative transfer
- Stars: atmospheres
- Stars: early-type
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science