Dept. of Physics and Astronomy & Center for Simulational Physics, University of Georgia, Athens, GA 30602-2451
Email: yeti@hal.physast.uga.edu

C.R.A.L (UML 5574) Ecole Normale Superieure, 69364 Lyon Cedex 7, France
E-Mail: fallard@ens-lyon.fr

Physics Dept., Wichita State University, Wichita, KS 67260-0032
Email: jfergus@twsu.edu

Dept. of Physics and Astronomy, University of Oklahoma,
440 W. Brooks, Rm 131, Norman, OK 73019-0225
E-Mail: baron@mail.nhn.ou.edu

Physics Dept., Wichita State University, Wichita, KS 67260-0032
Email: dra@twsuvm.uc.twsu.edu

Abstract:

We present the extension of our NextGen model atmosphere grid to the regime of giant stars. The input physics of the models presented here is nearly identical to the NextGen dwarf atmosphere models, however spherical geometry is used self-consistently in the model calculations (including the radiative transfer). We re-visit the discussion of the effects of spherical geometry on the structure of the atmospheres and the emitted spectra and discuss the results of NLTE calculations for a few selected models.