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On the relationship between circumstellar disc size and X-ray outbursts in Be/X-ray binaries

Monageng, IM and McBride, VA and Coe, MJ and Steele, IA and Reig, P (2017) On the relationship between circumstellar disc size and X-ray outbursts in Be/X-ray binaries. Monthly Notices of the Royal Astronomical Society, 464 (1). pp. 572-585. ISSN 0035-8711

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Abstract

We present long-term Hα monitoring results of five Be/X-ray binaries to study the Be disc size variations and their influence on type II (giant) X-ray outbursts. The work is done in the context of the viscous decretion disc model which predicts that Be discs in binary systems are truncated by resonant torques induced by the neutron star in its orbit. Our observations show that type II outbursts are not correlated (nor anticorrelated) with the disc size, as they are seen to occur both at relatively small and large Be disc radii. We discuss these observations in context of alternate interpretation of Be disc behaviour, such as precession, elongation and density effects, and with cognisance of the limitations of our disc size estimates.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 08 May 2017 11:57
Last Modified: 09 Sep 2017 03:37
DOI or Identification number: 10.1093/mnras/stw2354
URI: http://researchonline.ljmu.ac.uk/id/eprint/6375

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