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Stellar atmosphere represents a region of large gradients in thephysical variables such as the temperature, gas pressure and theradiation field. It is also where the stellar material becomesoptically thin with the result that the radiation field is nolonger strongly coupled to the local environment. As such, stellaratmospheres are comparatively difficult to model. A meaningfulinterpretation of stellar spectra, however, is only possible withthe assistance of consistent models. Consequently, much effort hasbeen devoted to the construction of such models over the pastfifty years.

Produktbeschreibung
Stellar atmosphere represents a region of large gradients in thephysical variables such as the temperature, gas pressure and theradiation field. It is also where the stellar material becomesoptically thin with the result that the radiation field is nolonger strongly coupled to the local environment. As such, stellaratmospheres are comparatively difficult to model. A meaningfulinterpretation of stellar spectra, however, is only possible withthe assistance of consistent models. Consequently, much effort hasbeen devoted to the construction of such models over the pastfifty years.
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Autorenporträt
I obtained my Ph.D. in Physics at Helwan University in 2000 and M.Sc.in Physics at the University of Helwan in 1995. I was initiated in research atmodel stellar atmosphere. Subsequently, I shifted to orbit determinationof visual binaries. My research interest is concerned with model stellaratmosphere analysis and computational astrophysics.