A statistical study of C IV regions in 20 Oe-stars |
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Authors: | A Antoniou E Danezis E Lyratzi L? Popovi? D Stathopoulos MS Dimitrijevi? |
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Institution: | 1. University of Athens, Faculty of Physics, Department of Astrophysics, Astronomy and Mechanics, Panepistimioupoli, Zographou, 157 84 Athens, Greece;2. Eugenides Foundation, 387 Sygrou Av., 17564 Athens, Greece;3. Astronomical Observatory of Belgrade, Volgina 7, 11160 Belgrade, Serbia |
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Abstract: | In this paper, using the Gauss-Rotation model (GR model), we analyse the UV C IV resonance lines in the spectra of 20 Oe-stars of different spectral subtypes, in order to detect the structure of C IV region. We study the presence and behavior of absorption clouds and analyse their characteristics. From this analysis we can calculate the values of a group of physical parameters, such as the apparent rotational and radial velocities, the random velocities of the thermal motions of the ions, the Full Width at Half Maximum (FWHM), the optical depth, as well as the absorbed energy and the column density of the independent regions of matter, which produce the main and the satellite clouds of the studied spectral lines. Finally, we present the relations between these physical parameters and the spectral subtypes of the studied stars and we give our results about the structure of the C IV region in their atmosphere. |
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Keywords: | Oe stars C IV resonance lines Density clouds Rotational velocities Radial velocities Random velocities |
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