Anomalous Phase Variations of the Accretion-Powered Millisecond Pulsar XTE J1807-294
This study reports pulse variation analysis results for the forth discovered accretion-powered millisecond pulsar XTE J1807-294 during its 2003 outburst observed by Rossi Timing Explorer (RXTE). The fine orbital parameters with P<,orb>=40.073601(8) min and a<,x> sini=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 20keV 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.
Accretion accretion disks—binaries close—pulsars individual (XTE J1807-294)—stars neutron-X-rays binaries
Yi Chou Yi-Ying Chung Chin-Ping Hu Ting-Chang Yang
Graduate Institute of Astronomy, National Central University No. 300, Jhongda Rd, Jhongli City, Taoyuan, Taiwan 320
国际会议
紧凑型物体的天体物理学国际会议(International Conference on Astrophysics of Compact Objects)
安徽黄山
英文
238-240
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）