Supersoft X-ray sources: the role of V Sge

Details Supersoft X-ray sources: the role of V Sge Supersoft X-ray sources: the role of V Sge

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007uasb.conf..243s&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

Accretion, Accretion Disks, Radiation Mechanisms: Thermal, Binaries: Close, Circumstellar Matter, Novae, Cataclysmic Variables, White Dwarfs, X-Rays: Binaries

Scientific paper

V Sge is one of a few known super-soft X-ray sources (SSXSs) located in our Galaxy and is the representative of the V Sge class. Here we concentrate on its long-term optical activity (mostly transitions between high and low states, clustering in so-called active segments). We show that cycles are often apparent in such transitions but their length undergoes large, often gradual variations. We give the implications for the accretion wind evolution, modeled by Hachisu & Kato (2003). We also analyze the color indices and absolute magnitudes of V Sge and compare them with those of ´classicaĺ SSXSs with the orbital period shorter than 4 d. This approach helps compare the properties and configuration of the medium, on which soft X-rays are reprocessed in these systems. The specific properties of SSXSs, as regards their optical activity, absolute magnitudes and colors, can be the promising tools for the search for such systems in the optical and near UV passbands. SSXSs yet undetected in the X-ray passband because of absorption thus can be revealed by the photometric method.

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