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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. Subject headings:methods: numerical — radiative transfer — stars: atmospheres — stars: early-type 1.
Lanz et al. (Sun,) studied this question.