On the relationship between circumstellar disc size and X-ray outbursts in Be/X-ray binaries
On the relationship between circumstellar disc size and X-ray outbursts in Be/X-ray binaries
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.
572-585
Monageng, I.M.
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McBride, V.A.
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Coe, Malcolm
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Steele, I.A.
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Reig, P.
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1 January 2017
Monageng, I.M.
2f5f38a6-c1ba-4c91-8bc8-805f49946bd8
McBride, V.A.
36106df1-eae1-4eff-974e-2aba84523b85
Coe, Malcolm
04dfb23b-1456-46a3-9242-5cee983471d5
Steele, I.A.
fcc18b27-53b8-4abb-a9fa-75cef9745c8b
Reig, P.
66ae1b8d-9c4b-449d-a459-6e8382a5986b
Monageng, I.M., McBride, V.A., Coe, Malcolm, Steele, I.A. 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), .
(doi:10.1093/mnras/stw2354).
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.
Text
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Accepted/In Press date: 14 September 2016
e-pub ahead of print date: 15 September 2016
Published date: 1 January 2017
Organisations:
Astronomy Group
Identifiers
Local EPrints ID: 402928
URI: http://eprints.soton.ac.uk/id/eprint/402928
ISSN: 1365-2966
PURE UUID: d46818d8-f79a-4954-a5bc-6a070bcab13b
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Date deposited: 18 Nov 2016 15:12
Last modified: 16 Mar 2024 02:35
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Contributors
Author:
I.M. Monageng
Author:
V.A. McBride
Author:
I.A. Steele
Author:
P. Reig
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