Anomalous phase variations of the accretion-powered millisecond pulsar XTE J1807-294

Yi Chou, Yi Ying Chung, Chin Ping Hu, Ting Chang Yang

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

This study reports pulse variation analysis results for the forth discovered accretion-powered millisecond pulsar XTE Jl 807-294 during its 2003 outburst observed by Rossi Timing Explorer (RXTE). The fine orbital parameters with Porb =40.073601(8) min and ax; sin i = 4.823(5) It-ms were first obtained after applying trend removal for the daily phase drift. The binary barycenter corrected pulse phases show smooth variation plus clear negative phase shifts coincident with the flares seen on the light curve as well as enhancements of fractional pulse amplitude. The non-flare pulse phases are well described as a fourth order polynomial implying that the neutron star was spun-up during the ourburst. Significant soft phase lags up to ∼500/μs between 2 to 20 keV were detected for the non-flare pulse phases. The variations of pulse phases during the flares and their energy-dependent shifts indicate that the anomalous phase shifts are a result from the "hot spot" shifting on the surface of neutron star.

原文???core.languages.en_GB???
主出版物標題Astrophysics of Compact Objects - International Conference on Astrophysics of Compact Objects
頁面238-240
頁數3
DOIs
出版狀態已出版 - 2008
事件International Conference on Astrophysics of Compact Objects - Huangshan City, China
持續時間: 1 7月 20077 7月 2007

出版系列

名字AIP Conference Proceedings
968
ISSN(列印)0094-243X
ISSN(電子)1551-7616

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???event.eventtypes.event.conference???International Conference on Astrophysics of Compact Objects
國家/地區China
城市Huangshan City
期間1/07/077/07/07

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