Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...451..643b&link_type=abstract
Astronomy and Astrophysics, Volume 451, Issue 2, May IV 2006, pp.643-650
Astronomy and Astrophysics
Astrophysics
15
Atomic Data, Methods: Numerical, Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Fundamental Parameters
Scientific paper
We describe an opacity sampled version of the LTE model atmosphere code sterne with revised continuous opacities. In particular, we examine the results of replacing the existing treatment of the continuous opacities which followed the method of Kurucz (1970, SAOSR, No. 309) and Peach (1970, MNRAS, 73, 1), with photoionization cross-sections from the Opacity Project and the IRON Project, and the effects of substituting an opacity distribution function method for treating the line opacities with an opacity sampling method. In studying the application of these new models to atmospheres with hydrogen-rich and extreme chemical compositions, we find the new opacity treatment increases the temperature in the line forming region by up to 3000 K for extremely hydrogen-poor stars and up to 1250 K for hydrogen-rich stars with T_eff = 30 000 K and log g = 3.00. This translates into systematically cooler effective temperature measurements for these types of stars.
Behara N. T.
Jeffery Simon C.
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