Search Publications
A statistical analysis of the SOT-Hinode observations of solar spicules and their wave-like behavior
Koutchmy, S.; Tavabi, E.; Ajabshirizadeh, A.
Spicules are an important very dynamical and rather cool structure extending between the solar surface and the corona. They are partly filling the space inside the chromosphere and they are surrounded by a transition thin layer. New space observations taken with the SOT of the Hinode mission shed some light on their still mysterious formation and …
A comprehensive study of six Algol type binaries
Liakos, A.; Zasche, P.; Niarchos, P.
CCD light curves of the Algol type eclipsing binaries DP Cep, AL Gem, FG Gem, UU Leo, CF Tau and AW Vul were analysed using the Wilson-Devinney code and new geometric and absolute parameters were derived. Due to cyclic apparent orbital period changes of the systems, probably caused by the Light-Time Effect, the contribution of a third light was ta…
Diffuse thermal X-ray emission in the core of the young massive cluster Westerlund 1
Kavanagh, P. J.; Norci, L.; Meurs, E. J. A.
We present an analysis of the diffuse hard X-ray emission in the core of the young massive Galactic cluster Westerlund 1 based on a 48 ks XMM-Newton observation. Chandra results for the diffuse X-ray emission have indicated a soft thermal component together with a hard component that could be either thermal or non-thermal. We seek to resolve this …
The data mining III: An analysis of 21 eclipsing binary light-curves observed by the INTEGRAL/OMC
Zasche, P.
Twenty-one eclipsing binaries were selected for an analysis from a huge database of observations made by the INTEGRAL/OMC camera. The photometric data were processed and analyzed, resulting in a first light-curve study of these neglected eclipsing binaries. In several systems from this sample even their orbital periods have been confirmed or modif…
Light curve analysis of Hipparcos data for the massive O-type eclipsing binary UW CMa
Parthasarathy, M.; Antokhina, E. A.; Srinivasa Rao, M.
Hipparcos photometric data for the massive O-type binary UW CMa were analysed within the framework of the Roche model. Photometric solutions were obtained for five mass ratios in the q = M2/ M1 = 0.5-1.5 range. The system is found to be in a contact configuration. Independently of q, the best-fitting model solutions correspon…
Two new systems with enhanced UV line flux ratios as indication of the evolution of cataclysmic variables
Sanad, M. R.
We present ultraviolet spectra of 62 cataclysmic variables observed with Hubble Space Telescope Space Telescope Imaging Spectrograph & Faint Object Spectrograph (HST STIS FOS) to diagnose cataclysmic variables with enhanced NV/C IV line flux ratios. We concentrated on calculating the line flux ratios of the above mentioned sample. We found tha…
New aspects of spectral behavior of SS Cyg and WX Hyi between quiescence and outburst states in the UV
Sanad, M. R.
We present low-resolution UV spectra of the dwarf novae SS Cyg and WX Hyi in both quiescence and outburst states from observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978-1994 and 1979-1993 for two systems respectively. Both SS Cyg and WX Hyi are characterized by emission lines in quiescence physical st…