Spin‐up and Phase Fluctuations in the Timing of the Accreting Millisecond Pulsar XTE J1807−294
نویسندگان
چکیده
منابع مشابه
Timing of the Accreting Millisecond Pulsar XTE J 1814 - 338
We present a precise timing analysis of the accreting millisecond pulsar XTE J1814– 338 during its 2003 outburst, observed by RXTE. A full orbital solution is given for the first time; Doppler effects induced by the motion of the source in the binary system were corrected, leading to a refined estimate of the orbital period, P orb = 15388.7229(2) s, and of the projected semimajor axis, a sin i/...
متن کاملSpin up and phase fluctuations in the timing of the accreting millisecond pulsar XTE J 1807 – 294
We performed a timing analysis of the 2003 outburst of the accreting X-ray millisecond pulsar XTE J1807–294 observed by RXTE. Using recently refined orbital parameters we report for the first time a precise estimate of the spin frequency and of the spin frequency derivative. The phase delays of the pulse profile show a strong erratic behavior superposed to what appears as a global spin-up trend...
متن کاملDoes the accreting millisecond pulsar XTE J1814−338 precess?
Precession in an accretion-powered pulsar is expected to produce characteristic variations in the pulse properties. Assuming surface intensity maps with one and two hotspots, we compute theoretically the periodic modulation of the mean flux, pulsephase residuals and fractional amplitudes of the first and second harmonic of the pulse profiles. These quantities are characterised in terms of their...
متن کاملDiscovery of a Second Millisecond Accreting Pulsar: XTE J1751–305
We report the discovery by the RXTE PCA of a second transient accreting millisecond pulsar, XTE J1751–305, during regular monitoring observations of the galactic bulge region. The pulsar has a spin frequency of 435 Hz, making it one of the fastest pulsars. The pulsations contain the signature of orbital Doppler modulation, which implies an orbital period of 42 minutes, the shortest orbital peri...
متن کاملDiscovery of kHz QPOs and shifted frequency correlations in the accreting millisecond pulsar XTE J1807–294
We report the discovery of twin kHz QPOs in the X ray flux of XTE J1807– 294, the fourth accreting millisecond pulsar (AMP). This is the second AMP exhibiting twin kHz QPOs. In contrast to the first case, SAX J1808.4–3658, the frequency separation ∆ν between the kHz QPOs is consistent with the pulse frequency (190.6 Hz), not with half that value, confirming for the first time from pulsation mea...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/533578