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Highly-Eccentric Be/X-ray Binaries: Evolution, Wind Rose Effect, Accretor-Propeller Luminosity Gap

Published online by Cambridge University Press:  12 April 2016

Natalya V. Raguzova  and
Vladimir M. Lipunov
Natalya V. Raguzova
Affiliation:
Sternberg Astronomical Institute, Moscow, 119899 Russia Faculty of Physics, Moscow University, Moscow, 117234, Russia
Vladimir M. Lipunov
Affiliation:
Sternberg Astronomical Institute, Moscow, 119899 Russia Faculty of Physics, Moscow University, Moscow, 117234, Russia

Abstract

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The influence of the spatial distribution of stellar wind velocities (Wind Rose effect) on the X-ray light curve of highly eccentric binaries is examined using the properties of Be disk-fed outflow. It is shown that a phase shift of the maximum X-ray luminosity is always present in the X-ray light curves. The observed X-ray light curves of some transient binaries are analysed using the developed model. We show that the Be/X-ray transients A0538–66, X0331+53 are likely to undergo transitions from the accreting neutron star regime to the propelling one. The example of evolutionary track which can lead to a formation of the Be/X-ray binary is presented. We conclude that synchronization is a very important process for Be star evolution in binary systems and calculate the critical orbital period for existence of a Be/X-ray binary.

Type
7. Interacting Binaries
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 685 - 688
Copyright
Copyright © Astronomical Society of the Pacific 2000

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