Spin-down rate of 1E 2259+586 from RXTE observation

Baykal, Altan
Strohmayer, T
Stark, MJ
We present new X-ray observations of the X-ray pulsar 1E 2259+586, obtained during March 1997, with the Rossi X-Ray Timing Explorer (RXTE). We have measured the pulse frequency derivative (nu) over dot = (-1.08 +/- 0.04) x 10(-14) Hz s(-1) from pulse arrival times obtained in a sequence of 5 observations spread over one month. This (nu) over dot is consistent with the long term spin-down trend. We also found that the observed X-ray luminosity is consistent with that measured at quiescent X-ray flux levels by previous missions. Our observations imply that 1E 2259 +/- 586 was spinning down steadily without exhibiting any stochastic torque noise fluctuations during the month covered by our observations.


Short-term pulse frequency fluctuations of OAO 1657-415 from RXTE observations
Baykal, Altan (2000-04-11)
We present new X-ray observations of the high-mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 d) with the Rossi X-Ray Timing Explorer (RXTE). Using the binary orbital parameters, obtained from Burst and Transient Source Experiment (BATSE) observations, we resolve the fluctuations in the pulse frequency at time-scales on the order of 1 d for the first time. Recent BATSE results by Baykal showed that OAO 1657-415 has spin-up/down trends in its pulse frequency time seri...
The steady spin-down rate of 4U 1907+09
Baykal, Altan; Alpar, MA; Zand, JI; Strohmayer, T (2001-11-11)
Using X-ray data from the Rossi X-ray Timing Explorer, we report the pulse timing results of the accretion-powered, high-mass X-ray binary pulsar 4U 1907 + 09, covering a time-span of almost two years. We measured three new pulse periods in addition to the previously measured four pulse periods. We are able to connect pulse arrival times in phase for more than a year. The source has been spinning down almost at a constant rate, with a spin-down rate of (nu) over dot = (- 3.54 +/- 0.02) x 10(-14) Hz s(-1) fo...
Timing studies on RXTE observations of SAX J2103.5+4545
Baykal, Altan; Stark, M. J.; Heffner, C. M.; Erkoca, A. E.; Swank, J. H. (2007-01-21)
SAX J2103.5+4545 has been continuously monitored for similar to 900 d by the Rossi X-ray Timing Explorer (RXTE) since its outburst in 2002 July. Using these observations and previous archival RXTE observations of SAX J2103.5+4545, we refined the binary orbital parameters and find the new orbital period as P = (12.665 36 +/- 0.000 88) d and the eccentricity as 0.4055 +/- 0.0032. With these new orbital parameters, we constructed the pulse frequency and pulse frequency derivative histories of the pulsar and co...
Discovery of the orbit of the transient X-ray pulsar SAX J2103.5+4545
Baykal, Altan; Swank, J (IOP Publishing, 2000-12-01)
Using X-ray data from the Rossi X-Ray Timing Explorer (RXTE), we carried out a pulse-timing analysis of the transient X-ray pulsar SAX J2103.5+4545. An outburst was detected by the All-Sky Monitor (ASM) in 1999 October 25 and reached a peak X-ray brightness of 27 mcrab on October 28. Between November 19 and December 27, the RXTE Proportional Counter Array (PCA) carried out pointed observations that provided us with pulse arrival times. These yield an eccentric orbit (e = 0.4 +/- 0.2) with an orbital period ...
On the outburst light curves of black hole soft X-ray transients
Ertan, Ünal; Kızıloğlu, Ümit; Alpar, M. Ali; Department of Physics (2002)
We explore the X-ray outburst light curves of black-hole soft X-ray transients. First, the analytical solutions for pure viscous disk evolution are investigated by using the time independent kinematic viscosities in the form v <x RP. The illustrative viscosity models which give best fits to the observed X-ray data with reasonable initial conditions are also examined through the observed in ner disk properties in quiescence. It is seen that the viscosity law power law index (p ~ 1) can account for both the o...
Citation Formats
A. Baykal, T. Strohmayer, and M. Stark, “Spin-down rate of 1E 2259+586 from RXTE observation,” ASTRONOMY & ASTROPHYSICS, pp. 173–176, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53029.