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Spectral behavior of AE Aqr between high and low states in the UV
Sanad, M. R.
We present ultraviolet spectra of the AE Aqr binary system taken by the International Ultraviolet Explorer (IUE) during the period from 1978 to 1993, to accomplish a large scale study of what happens to the ultraviolet fluxes of different emission lines during different orbital phases. Five profiles of AE Aqr binary system show variations of line …
Physical mechanisms of the spectral variability of α Orionis with IUE
Sanad, M. R.
We present a spectroscopic study of Mg II k&h emission lines in the 2000-3000 Å region of 91 high resolution IUE spectra of α Orionis obtained during the period 1978-1996. There are absorption and emission components on the blue sides of the k&h emission lines, these components may be coming from the dust envelope located inside the extend…
Spectral variability of the α Sco AB binary system observed with IUE
Sanad, M. R.; Bobrowsky, M.
We present ultraviolet spectra of the α Sco AB binary system taken by the International Ultraviolet Explorer during the period from 1979 to 1995. An investigation is carried out on the spectral variability of Mg II k and h emission lines arising from the chromosphere of α Sco A ( Van der Hucht et al., 1979). There are absorption and emission compo…
Disparity of spectral behavior of RR Tel and RX Pup in the UV
Sanad, M. R.
The main aim of this study is to use archival low-dispersion spectra from the International Ultraviolet Explorer (IUE) in an attempt to follow up the spectral behavior of two symbiotic Mira systems RR Tel and RX Pup of the period from 1978-1995 and 1979-1989 for two systems respectively. We concentrated on studying N IV 1486 Å intercombination lin…
Eclipsing and density effects on the spectral behavior of Beta Lyrae binary system in the UV
Sanad, M. R.
We analyze both long and short high resolution ultraviolet spectrum of Beta Lyrae eclipsing binary system observed with the International Ultraviolet Explorer (IUE) between 1980 and 1989. The main spectral features are P Cygni profiles originating from different environments of Beta Lyrae. A set of 23 Mg II k&h spectral lines at 2800 Å, origin…