SXP 15.6 - an accreting pulsar close to spin equilibrium?
SXP 15.6 - an accreting pulsar close to spin equilibrium?
SXP 15.6 is a recently established Be star X-ray binary system in the
Small Magellanic Cloud (SMC). Like many such systems, the variable X-ray
emission is driven by the underlying behaviour of the mass donor Be
star. It is shown here that the neutron star in this system is
exceptionally close to spin equilibrium averaged over several years,
with the angular momentum gain from mass transfer being almost exactly
balanced by radiative losses. This makes SXP 15.6 exceptional compared
to all other known members of its class in the SMC, all of whom exhibit
much higher spin period changes. In this paper, we report on X-ray
observations of the brightest known outburst from this system. These
observations are supported by contemporaneous optical and radio
observations, as well as several years of historical data.
Be, X-rays: binaries, stars: emission line
5567-5574
Coe, M. J.
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Monageng, I. M.
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Kennea, J. A.
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Buckley, D.A.H.
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Evans, P. A.
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Udalski, A.
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Groot, Paul
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Bloemen, Steven
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Vreeswijk, Paul
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McBride, Vanessa
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Klein-Wolt, Marc
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Woudt, Patrick
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Körding, Elmar
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Le Poole, Rudolf
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Pieterse, Danielle
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1 July 2022
Coe, M. J.
04dfb23b-1456-46a3-9242-5cee983471d5
Monageng, I. M.
2f5f38a6-c1ba-4c91-8bc8-805f49946bd8
Kennea, J. A.
8a2485ff-bd59-4dd8-b6e3-d02e86bbc344
Buckley, D.A.H.
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Evans, P. A.
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Udalski, A.
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Groot, Paul
4e8a3306-c19a-435f-bf03-be2bd029068d
Bloemen, Steven
ae60b334-f3a6-49f3-932e-958043c6fd21
Vreeswijk, Paul
826051d2-d0e7-43fa-afd5-8714ff495077
McBride, Vanessa
aee41ff6-54d9-4160-a59d-eced7ef45bd7
Klein-Wolt, Marc
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Woudt, Patrick
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Körding, Elmar
010d20e9-2392-4411-a4a0-82e78c6a9de9
Le Poole, Rudolf
bc6139d4-1944-4653-b817-6c614c20d2ed
Pieterse, Danielle
6f790089-b5a8-4be1-a6c1-be2586c373dc
Coe, M. J., Monageng, I. M., Kennea, J. A., Buckley, D.A.H., Evans, P. A., Udalski, A., Groot, Paul, Bloemen, Steven, Vreeswijk, Paul, McBride, Vanessa, Klein-Wolt, Marc, Woudt, Patrick, Körding, Elmar, Le Poole, Rudolf and Pieterse, Danielle
(2022)
SXP 15.6 - an accreting pulsar close to spin equilibrium?
Monthly Notices Of The Royal Astronomical Society, 513 (4), .
(doi:10.1093/mnras/stac1208).
Abstract
SXP 15.6 is a recently established Be star X-ray binary system in the
Small Magellanic Cloud (SMC). Like many such systems, the variable X-ray
emission is driven by the underlying behaviour of the mass donor Be
star. It is shown here that the neutron star in this system is
exceptionally close to spin equilibrium averaged over several years,
with the angular momentum gain from mass transfer being almost exactly
balanced by radiative losses. This makes SXP 15.6 exceptional compared
to all other known members of its class in the SMC, all of whom exhibit
much higher spin period changes. In this paper, we report on X-ray
observations of the brightest known outburst from this system. These
observations are supported by contemporaneous optical and radio
observations, as well as several years of historical data.
More information
Accepted/In Press date: 25 April 2022
Published date: 1 July 2022
Additional Information:
Publisher Copyright:
© 2022 The Author(s).
Keywords:
Be, X-rays: binaries, stars: emission line
Identifiers
Local EPrints ID: 475435
URI: http://eprints.soton.ac.uk/id/eprint/475435
ISSN: 1365-2966
PURE UUID: 79cb79a6-e6b9-4ef5-bcf5-55a6c6240e21
Catalogue record
Date deposited: 17 Mar 2023 17:39
Last modified: 17 Mar 2024 02:33
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Contributors
Author:
I. M. Monageng
Author:
J. A. Kennea
Author:
D.A.H. Buckley
Author:
P. A. Evans
Author:
A. Udalski
Author:
Paul Groot
Author:
Steven Bloemen
Author:
Paul Vreeswijk
Author:
Vanessa McBride
Author:
Marc Klein-Wolt
Author:
Patrick Woudt
Author:
Elmar Körding
Author:
Rudolf Le Poole
Author:
Danielle Pieterse
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