Multiwavelength observations of the Be/X-ray binary IGR J01217-7257 (=SXP 2.16) during outburst

被引：6
|
作者：
Boon, C. M. [1 ]
Bird, A. J. [1 ]
Coe, M. J. [1 ]
Corbet, R. H. D. [2 ,3 ,4 ]
Evans, P. A. [5 ]
Kennea, J. A. [6 ]
Krimm, H. A. [7 ,8 ,9 ]
Laycock, S. G. T. [10 ]
Udalski, A. [1 ,11 ]
机构：
[1] Univ Southampton, Dept Phys & Astron, Univ Rd, Southampton SO17 1BJ, Hants, England
[2] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA
[3] NASA, Goddard Space Flight Ctr, Xray Astrophys Lab, CRESST, Mail Code 662, Greenbelt, MD 20771 USA
[4] Maryland Inst Coll Art, 1300 W Mt Royal Ave, Baltimore, MD 21217 USA
[5] Univ Leicester, Xray & Observat Astron Res Grp, Leicester Inst Space & Earth Observat, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England
[6] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA
[7] NASA, Goddard Space Flight Ctr, CRESST, Mail Code 661, Greenbelt, MD 20771 USA
[8] Univ Space Res Assoc, 10211 Wincopin Circle,Suite 500, Columbia, MD 21044 USA
[9] Natl Sci Fdn, 4201 Wilson Blvd, Arlington, VA 22230 USA
[10] Univ Massachusetts, Dept Phys, Lowell, MA 01854 USA
[11] Univ Warsaw Observ, Aleje Ujazdowskie 4, PL-00478 Warsaw, Poland
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 466卷 / 01期
基金：
英国科学技术设施理事会;
关键词：
accretion; accretion discs; stars:; emission-line; Be; X-rays: binaries; SMALL-MAGELLANIC-CLOUD; GRAVITATIONAL LENSING EXPERIMENT; WIND-ACCRETION; TIME-SERIES; STARS; POPULATION; MODULATION; MISSION; LONG; IBIS;
D O I：
10.1093/mnras/stw3169
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present simultaneous, multiwavelength observations of the Small Magellanic Cloud Be/XRB IGR J01217-7257 (=SXP 2.16) during outbursts in 2014, 2015 and 2016. We also present the results of the RXTE observations of the Small Magellanic Cloud during which the source was initially discovered with a periodicity of 2.1652 +/- 0.0001 s that we associate with the spin period of the neutron star. A systematic temporal analysis of long-term Swift/BAT data reveals a periodic signal of 82.5 +/- 0.7 d, in contrast with a similar analysis of long base-line Optical Gravitational Lensing Experiment (OGLE) I-band light curves that reveals 83.67 +/- 0.05 d also found in this work. Interpreting the longer X-ray periodicity as indicative of binary motion of the neutron star, we find that outbursts detected by INTEGRAL and Swift between 2014 and 2016 are consistent with type I outbursts seen in Be/XRBs, occurring around periastron. Comparing these outbursts with the OGLE data, we see a clear correlation between outburst occurrence and increasing I-band flux. A periodic analysis of subdivisions of OGLE data reveals three epochs during which short periodicities of similar to 1 d are significantly detected which we suggest are non-radial pulsations (NRPs) of the companion star. These seasons immediately precede those exhibiting clear outburst behaviour, supporting the suggested association between the NRPs, decretion disc growth and the onset of type I outbursts.
引用
收藏
页码：1149 / 1159
页数：11
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