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Ultra-compact X-ray binaries with high luminosity: a key for a new scenario

Published online by Cambridge University Press:  20 March 2013

Konstantin Pavlovskii  and
Natalia Ivanova
Konstantin Pavlovskii
Affiliation:
Dept. of Physics, University of Alberta, 11322-89 Ave, Edmonton, AB, T6G 2E7, Canada email: pavlovsk@ualberta.ca, nata.ivanova@ualberta.ca
Natalia Ivanova
Affiliation:
Dept. of Physics, University of Alberta, 11322-89 Ave, Edmonton, AB, T6G 2E7, Canada email: pavlovsk@ualberta.ca, nata.ivanova@ualberta.ca
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Abstract

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Ultra-compact X-ray binaries (UCXBs) are accreting systems with periods less than 1 hour, which qualifies them to contain a degenerate donor-companion. One would expect such systems to have the easiest theoretical explanation, compared to other kinds of X-ray binaries. Nonetheless, current theory fails to explain high mass transfer (MT) rates in three recently well observed long-period UCXBs. We find that this range of MT rates can be maintained if the donor is a remnant of an out-of-thermal-equilibrium naked core of a giant which was revealed in a very recent episode of a common envelope (CE) event.

Keywords

accretionaccretion disksbinaries: closeX-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 468 - 470
Copyright
Copyright © International Astronomical Union 2013

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