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@inproceedings{1530617, author = {Kurfürst, Petr and Krtička, Jiří}, address = {Neuveden}, booktitle = {Proceedings of the 50thConference on Variable Stars Research}, editor = {Radek Kocián}, keywords = {Be stars; Be disks; variability; BeX-ray binaries; accretion rate}, howpublished = {elektronická verze "online"}, language = {eng}, location = {Neuveden}, pages = {43-49}, publisher = {Open European Journal on Variable Stars}, title = {Modeling variability of Be stars}, url = {http://var.astro.cz/oejv/issues/oejv0197.pdf}, year = {2019} }
TY - JOUR ID - 1530617 AU - Kurfürst, Petr - Krtička, Jiří PY - 2019 TI - Modeling variability of Be stars PB - Open European Journal on Variable Stars CY - Neuveden KW - Be stars KW - Be disks KW - variability KW - BeX-ray binaries KW - accretion rate UR - http://var.astro.cz/oejv/issues/oejv0197.pdf L2 - http://var.astro.cz/oejv/issues/oejv0197.pdf N2 - Be stars are rapidly rotating non-supergiant B-type stars surrounded by equatorial Keplerian disks. The characteristic property of all Be stars is their multiperiodic variability driven for example by pulsations in isolated Be stars or by the effects of binarity. We assume in our models the equatorial decretion disk that stems from the angular momentum loss needed to keep the central object at or below the critical rotation. Using our hydrodynamic code, we calculate the 2D profile of Be stars’ disk structure under various physical and geometrical configurations of the star-disk system as well as various profiles of the circumstellar medium. The tidal interactions in binary systems facilitate the matter ejection from the equatorial region of the star, and there is also evidence of warping of the disk in binaries. The important subclass is the Be/X-ray binaries, consisting of a Be star and mostly a neutron star (NS), which belong to the brightest objects in the X-ray sky. Intensive matter accretion from the optical donor companion onto the compact object in a relatively close binary system produces transient phases of the high energy X-ray emission which dramatically vary in brightness and whose timescales may range from milliseconds to years. We calculate the effects of X-ray irradiation on the temperature structure of the Be stars’ disk. Using the Bondi-Hoyle-Littleton approximation, we estimate the NS accretion rate and the excess of X-ray luminosity during various phases of NS-disk interaction. ER -
KURFÜRST, Petr and Jiří KRTIČKA. Modeling variability of Be stars. Online. In Radek Kocián. \textit{Proceedings of the 50thConference on Variable Stars Research}. Neuveden: Open European Journal on Variable Stars, 2019, p.~43-49. ISSN~1801-5964.
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