☆ 4.7 Article

Apsidal motion in 4U 0115+63 and orbital parameters of 2S 1417-624 and V0332+53

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2010)

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Volume 406, Issue 4, Pages 2663-2670

Publisher

OXFORD UNIV PRESS

DOI: 10.1111/j.1365-2966.2010.16862.x

Keywords

binaries: general; stars: emission line; Be; stars: individual: 4U 0115+63; stars: individual: V0332+53; stars: individual: 2S 1417-624; X-rays: binaries

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Abstract

Be/X-ray binary pulsars have wide eccentric orbits and hence the angle of periastron of the orbit is very well defined in these sources. The presence of an X-ray pulsar allows for accurate measurements of orbital elements. A Be star usually is a rapidly rotating star and hence will deviate from spherical geometry. The tidal interaction between the neutron star and the Be star will add to the distortion of the Be star and alter its mass distribution. Thus a measurable rate of apsidal motion is expected from these systems. In this paper, we present the first conclusive detection of apsidal motion of the binary 4U 0115+63. We also present new and accurate orbital parameters of the Be/X-ray binaries V0332+53 and 2S 1417-624.

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QPOs and orbital elements of X-ray binary 4U 0115+63 during the 2017 outburst observed by Insight-HXMT

Y. Z. Ding, W. Wang, P. Zhang, Q. C. Bu, C. Cai, X. L. Cao, C. Zhi, L. Chen, T. X. Chen, Y. B. Chen, Y. Chen, Y. P. Chen, W. W. Cui, Y. Y. Du, G. H. Gao, H. Gao, M. Y. Ge, Y. D. Gu, J. Guan, C. C. Guo, D. W. Han, Y. Huang, J. Huo, S. M. Jia, W. C. Jiang, J. Jin, L. D. Kong, B. Li, C. K. Li, G. Li, T. P. Li, W. Li, X. Li, X. B. Li, X. F. Li, Z. W. Li, X. H. Liang, J. Y. Liao, B. S. Liu, C. Z. Liu, H. X. Liu, H. W. Liu, X. J. Liu, F. J. Lu, X. F. Lu, Q. Lou, T. Luo, R. C. Ma, X. Ma, B. Meng, Y. Nang, J. Y. Nie, J. L. Qu, X. Q. Ren, N. Sai, L. M. Song, X. Y. Song, L. Sun, Y. Tan, L. Tao, Y. L. Tuo, C. Wang, L. J. Wang, P. J. Wang, W. S. Wang, Y. S. Wang, X. Y. Wen, B. Y. Wu, B. B. Wu, M. Wu, G. C. Xiao, S. Xiao, S. L. Xiong, Y. P. Xu, R. J. Yang, S. Yang, Y. J. Yang, Q. B. Yi, Q. Q. Yin, Y. You, F. Zhang, H. M. Zhang, J. Zhang, P. Zhang, S. Zhang, S. N. Zhang, W. C. Zhang, W. Zhang, Y. F. Zhang, Y. H. Zhang, H. S. Zhao, X. F. Zhao, S. J. Zheng, Y. G. Zheng, D. K. Zhou

Summary: This paper presents a detailed timing analysis of a prominent outburst of 4U 0115+63 detected by Insight-IDCMT in August 2017. The study determined the spin period of the neutron star, measured period variability, extracted orbital elements, and introduced wavelet analysis to study QPO signals. Multiple QPOs were discovered at different frequencies, and positive relations between X-ray luminosity and QPO properties were found. The study also observed drift in pulse phase of certain QPOs and dissipation of oscillations from high energy to low energy.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)