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Unveiling the super-orbital modulation of LS I + 61°303 in X-rays

Published online by Cambridge University Press:  21 February 2013

Jian Li ,
Diego F. Torres ,
Shu Zhang ,
Daniela Hadasch ,
Nanda Rea ,
G. Andrea Caliandro ,
Yupeng Chen  and
Jianmin Wang
Jian Li
Affiliation:
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China, email: jianli@ihep.ac.cn Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, 08193 Barcelona, Spain
Diego F. Torres
Affiliation:
Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, 08193 Barcelona, Spain
Shu Zhang
Affiliation:
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China, email: jianli@ihep.ac.cn
Daniela Hadasch
Affiliation:
Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, 08193 Barcelona, Spain
Nanda Rea
Affiliation:
Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, 08193 Barcelona, Spain
G. Andrea Caliandro
Affiliation:
Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, 08193 Barcelona, Spain
Yupeng Chen
Affiliation:
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China, email: jianli@ihep.ac.cn
Jianmin Wang
Affiliation:
Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, China, email: jianli@ihep.ac.cn
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Abstract

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We found evidence for the super–orbital modulation in the X-ray emission of LS I + 61°303 from the longest monitoring date by the RXTE. The time evolution of the modulated fraction in the orbital light curves can be well fitted with a sinusoidal function having a super-orbital period of 1667 days. However, we have found a 281.8±44.6 day shift between the super-orbital variability found at radio frequencies and our X-ray data. We also find a super-orbital modulation in the maximum count rate of the orbital light curves, compatible with the former results, including the shift.

Keywords

X-rays: binariesX-rays: individual (LS I + 61°303)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 255 - 256
Copyright
Copyright © International Astronomical Union 2013

References

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