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Astron. Astrophys. 336, 173-176 (1998)

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

A. Baykal 1, J.H. Swank 2, T. Strohmayer 2 and M.J. Stark 2

1 Physics Department, Middle East Technical University, Ankara 06531, Turkey
2 Laboratory for High Energy Astrophysics NASA/GSFC Greenbelt, Maryland 20771, USA

Received 26 March 1998 / Accepted 27 April 1998


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 [FORMULA] Hz s-1 from pulse arrival times obtained in a sequence of 5 observations spread over one month. This [FORMULA] 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.

Key words: accretion, accretion disks – pulsars: individual: 1E 2259+586 – X-rays: stars

Send offprint requests to: Altan Baykal

© European Southern Observatory (ESO) 1998

Online publication: July 7, 1998