Recovery of the orbital parameters and pulse evolution of V0332+53 during a huge outburst

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	Recovery of the orbital parameters and pulse evolution of V0332+53 during a huge outburst
	Zhang S(张澍); Qu JL(屈进禄); Song LM(宋黎明); Zhang, S; Qu, JL; Song, LM; Torres, DF
刊名	ASTROPHYSICAL JOURNAL
	2005
卷号	630 期号:1 页码:L65-L68
关键词	stars : individual (V0332+53) X-rays : binaries
通讯作者	Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China ; Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA
英文摘要	The high- mass X-ray binary V0332+53 became active at the end of 2004, and the outburst was observed in hard X-rays by RXTE and INTEGRAL. Based on these hard X-ray observations, we measure the orbital parameters by fitting the Doppler-shifted spin periods. The derived orbital period and eccentricity are consistent with those obtained by Stella et al. from EXOSAT observations, whereas the projected semimajor axis and the periastron longitude are found to have changed from 48 +/- 4 to 86(-10)(+6) lt-s and from 313 degrees +/- 10 to 283 degrees +/- 14 degrees, respectively. This would indicate an angular speed of =1 degrees.5 +/- 0 degrees.8 yr(-1) for the rotation of the orbit over the past 21 years. The periastron passage time of MJD 53,367 +/- 1 is just around the time when the intensity reached maximum, and an orbital period earlier is the time when the outburst started. This correlation resembles the behavior of a type I outburst. During outburst, the source spun up at a rate of 8.01(-1.14)(+1.00) s day(-1). The evolution of the pulse profile is highly intensity dependent. The separation of double pulses remained almost constant (similar to 0.47) when the source was bright and dropped to 0.37 within 3 days as the source became weaker. The pulse evolution of V0332+53 may be correlated with a change in dominance of the emission between fan-beam and pencil-beam mechanisms.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000231440000017
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240287]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhang S,Qu JL,Song LM,et al. Recovery of the orbital parameters and pulse evolution of V0332+53 during a huge outburst[J]. ASTROPHYSICAL JOURNAL,2005,630(1):L65-L68.
APA	张澍.,屈进禄.,宋黎明.,Zhang, S.,Qu, JL.,...&Torres, DF.(2005).Recovery of the orbital parameters and pulse evolution of V0332+53 during a huge outburst.ASTROPHYSICAL JOURNAL,630(1),L65-L68.
MLA	张澍,et al."Recovery of the orbital parameters and pulse evolution of V0332+53 during a huge outburst".ASTROPHYSICAL JOURNAL 630.1(2005):L65-L68.