The 2022 super-Eddington outburst of the source SMC X-2

被引：0

作者：

Coe, M. J. ^{[1
]}

Kennea, J. A. ^{[2
]}

Monageng, I. M. ^{[3
,4
]}

Townsend, L. J. ^{[5
]}

Buckley, D. A. H. ^{[3
,4
]}

Williams, M. ^{[2
]}

Udalski, A. ^{[6
]}

Evans, P. A. ^{[7
]}

机构：

[1] Univ Southampton, Phys & Astron, Southampton SO17 1BJ, England

[2] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[3] South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa

[4] Univ Cape Town, Dept Astron, Private Bag X3, ZA-7701 Rondebosch, South Africa

[5] Southern African Large Telescope, Cape Town, South Africa

[6] Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland

[7] Univ Leicester, Sch Phys & Astron, Xray & Observat Astron Res Grp, Univ Rd, Leicester LE1 7RH, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 528卷 / 04期

关键词：

stars:; emission-line; Be; X-rays: binaries; BE/X-RAY BINARIES; X-RAY; VARIABILITY; PARAMETERS; STARS; LINES;

D O I：

10.1093/mnras/stae495

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

SMC X-2 exhibits X-ray outburst behaviour that makes it one of the most luminous X-ray sources in the Small Magellanic Cloud. In the last decade it has undergone two such massive outbursts - in 2015 and 2022. The first outburst is well reported in the literature, but the 2022 event has yet to be fully described and discussed. That is the goal of this paper. In particular, the post-peak characteristics of the two events are compared. This reveals clear similarities in decay profiles, believed to be related to different accretion mechanisms occurring at different times as the outbursts evolve. The H alpha emission line indicates that the Be disc undergoes complex structural variability, with evidence of warping as a result of its interaction with the neutron star. The detailed observations reported here will be important for modelling such interactions in this kind of binary systems.

引用

页码：7115 / 7122

页数：8

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