An X-ray and optical study of the outbursting behaviour of the SMC Be X-ray binary SXP 91.1
An X-ray and optical study of the outbursting behaviour of the SMC Be X-ray binary SXP 91.1
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对 SMC Be X 射线双星 SXP 91.1 爆发行为的 X 射线和光学研究
DOI:
10.1093/mnras/stz2262
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发表时间:
2019
影响因子:
4.8
通讯作者:
Monageng I
中科院分区:
文献类型:
--
作者:
Monageng I
In this paper we report on the optical and X-ray behaviour of the Be X-ray binary, SXP 91.1, during a recent type I outburst. We monitored the outburst using the Neil GehrelsSwiftObservatory. These data were supported by optical data from the Southern African Large Telescope and the Optical Gravitational Lensing Experiment (OGLE) to show the circumstellar disc activity. Matter from this disc accretes on to the neutron star, giving rise to the X-ray outburst as seen in the synchronous evolution of the optical and X-ray light curves. Using data taken with OGLE we show that the circumstellar disc has exhibited stable behaviour over two decades. A positive correlation is seen between the colour and magnitude from the OGLE and massive compact halo object observations, which indicates that the disc is orientated at relatively low-inclination angles. From the OGLE andSwiftdata, we demonstrate that the system has shown relative phase offsets that have persisted for many years. The spin period derivative is seen to be at maximum spin-up at phases when the mass accretion rate is at maximum. We show that the neutron star in SXP 91.1 is an unusual member of its class in the sense that it has had a consistent spin period derivative over many years, with the average spin-up rate being one of the highest for known Small Magellanic Cloud pulsars. The most recent measurements of the spin-up rate reveal higher values than the global trend, which is attributed to the recent mass accretion event leading to the current outburst.
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影响因子:
4.9
作者:
Thiem C. Hoang;A. Lazarian;P. Martin
通讯作者:
P. Martin
DOI:
--
发表时间:
2015
期刊:
--
影响因子:
--
作者:
S. Crawford
通讯作者:
S. Crawford
DOI:
--
发表时间:
1998
期刊:
Publications Astronomical Society of Australia
影响因子:
--
作者:
Q. Parker;S. Phillipps
通讯作者:
S. Phillipps
DOI:
--
发表时间:
2010-07
期刊:
--
影响因子:
--
作者:
Ian S. McLean;Suzanne K. Ramsay;Hideki Takami
通讯作者:
Ian S. McLean;Suzanne K. Ramsay;Hideki Takami
DOI:
10.1111/j.1365-2966.2011.18289.x
发表时间:
2011
影响因子:
4.8
作者:
Jonathan D. Diaz;K. Bekki
通讯作者:
K. Bekki