Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf..131l&link_type=abstract
UV Astronomy: Stars from Birth to Death. Proceedings of the Joint Discussion n.4 during the IAU general Assembly of 2006. Ana I.
Astronomy and Astrophysics
Astronomy
Uv Astronomy, Hot Emission Stars, H, Dacs, Sacs
Scientific paper
DACs and SACs phenomena in Hα line of 120 Be stars In this study we apply the method proposed by Danezis et al. (2003, 2005) on the stellar spectrographs of 120 Be stars, and we examine the variations of the physical parameters, stated below, as a function of the spectral subtype and the luminosity class. We found that in the Be-type stellar atmospheres, there are two regions that can produce the Hα Satellite Absorption Components (SACs or DACs). The first one lies in the chromosphere and the second one in the cool extended envelope. With the above method we calculate: a) For the chromospheric absorption components: the optical depth as well as the rotational and radial velocities of the independent regions of matter which produce the main and the satellites components. b) For the emission and absorption components which are created in the cool extended envelope: the FWHM, the optical depth and the radial velocities of the independent regions of matter which produce the main and the satellites components.
Antoniou Antonios
Danezis Emanouel
Dimitrijevic Milan S.
Lyratzi Evaggelia
Nikolaidis Dimitris
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