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[32.02] Spectrum Modeling of Distorted Stellar Atmospheres and the X-ray Binary V4641 Sgr

E. J. Lentz (U. Georgia), J. A. Orosz (San Diego St.), P. H. Hauschildt (Hamburg Obs.)

We have developed a method to compute synthetic spectra for stars which have rotationally or tidally distorted atmospheres which vary in effective temperature and gravity over their surfaces. The spectra are composited from the specific intensities from high resolution, spherical, non-LTE model atmospheres for each segment of the surface. We consider the effects of tidal distortion on the spectrum of the X-ray binary V4641 Sgr (SAX J1819.3-2525) by comparing the composite model spectrum to portions of an Echelle spectrum of the star. The parameters for the component model atmospheres segments, including effective temperature and gravity and the projected area and velocity, are taken from a model (Orosz et al. 2003) of the star built using broadband filter specific intensities from the same atmosphere models.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.