Light curve morphology study of UW CrB - evidence for a 5 d superorbital period

被引:8
|
作者
Hakala, Pasi [1 ]
Hjalmarsdotter, Linnea [2 ]
Hannikainen, Diana C. [2 ,3 ]
Muhli, Panu [2 ]
机构
[1] Univ Turku, Tuorla Observ, FIN-21500 Pukkio, Finland
[2] Univ Helsinki, Observ, FIN-00014 Helsinki, Finland
[3] Metsahovi Radio Observ TKK, FIN-02540 Kylmala, Finland
基金
芬兰科学院;
关键词
accretion; accretion discs; binaries: close; X-RAY BINARY; MS 1603.6+2600; CORONAE-BOREALIS; ACCRETION-DISK;
D O I
10.1111/j.1365-2966.2008.14374.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Since its discovery in 1990, UW CrB (also known as MS 1603+2600) has remained a peculiar source without firm classification. Our current understanding is that it is an accretion disc corona (ADC) low-mass X-ray binary. In this paper, we present results from our photometric campaign dedicated to studying the changing morphology of the optical light curves. We find that the optical light curves show remarkable evidence for strongly evolving light curve shapes. In addition, we find that these changes show a modulation at a period of similar to 5 d. We interpret these changes as either due to strong periodic accretion disc warping or due to other geometrical changes because of disc precession at a period of 5 d. Finally, we have detected 11 new optical bursts, the phase distribution of which supports the idea of a vertically extended asymmetric accretion disc.
引用
收藏
页码:892 / 899
页数:8
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