A New Grid of NLTE Model Atmospheres of Hot Stars

Details A New Grid of NLTE Model Atmospheres of Hot Stars A New Grid of NLTE Model Atmospheres of Hot Stars

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.7812h&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #78.12; Bulletin of the American Astronomical Society, Vol. 32, p.1531

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We briefly describe improvements in our non-LTE model atmosphere code, TLUSTY. The upgrades include opacity sampling, improved Fe collisional strengths, resonance-averaged photoionization cross-sections, and a number of numerical enhancements. Using TLUSTY, version 200, we have calculated a grid of NLTE, fully-blanketed, model atmospheres covering the range of O to early B-type stars ( 20000 <= T eff <= 55000 K, 3.0 <= log g <= 4.75) with a solar or 1/5 solar metallicity. The models incorporate over 70,000 NLTE atomic levels of about 30 ions of H, He, C, N, O, Ne, Mg, Si, S, Fe and Ni, which are grouped into about 700 superlevels. We compare our predicted EUV fluxes to other existing grids of model atmospheres (Atlas9, CoStar models), as well as to actual UV and optical observations of representative stars.

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