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Title	Spectroscopic study of the Be optical counterpart to the high-mass X-ray binary source IGR J21343+4738
Thesis advisor	Ψαραδάκη, Ιωάννα
Thesis advisor	Ζέζας, Ανδρέας
Abstract	The main aspect of this work is to determine the physical properties of the optical counterpart to the INTEGRAL X-ray binary source IGR J21343+4738 and also to study its long-term variability. Spectroscopic data since 2009 in the red region of the optical spectrum allowed to study the Ha line profile (6563A) in order to determine the variability of the disk and to report a disk loss episode. Additionally, observations in the blue region were used to the spectral classification of the optical star as well as to estimate the rotational velocity of the star and the disk radius. The Ha line changed from an absorption dominated profile to an emission line profile and then back to absorption. It was found that the optical counterpart to the X-ray source IGR J21343+4738 is a Be star which presents disk-loss episodes with period at least four years. Also the estimation of the rotational velocity of the star showed that the fast rotation of the Be star is the main mechanism that expels matter from the photosphere to create the disk. Finally it was noted that τηε width of the Balmer and HeI lines is strongly affected by the existence of the disc around the Be star.
Language	English
Issue date	2014-07-25
Collection	School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
	Type of Work--Graduate theses
Permanent Link	https://elocus.lib.uoc.gr//dlib/e/7/4/metadata-dlib-1404801246-850885-7148.tkl
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