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Astron. Astrophys. 344, L25-L28 (1999)

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Letter to the Editor

Timing analysis of the X-ray transient source XTE J1806-246 (2S1803-245)

M. Revnivtsev 1,2, K. Borozdin 3,1 and A. Emelyanov 1,2

1 Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
2 Max-Planck-Institute für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching bei München, Germany
3 Los Alamos National Laboratory, NIS-2, Los Alamos, 87545 New Mexico, USA

Received 10 February 1999 / Accepted 26 February 1999


An outburst of the X-ray transient source XTE J1806-246 (2S1803-245) was observed by the Rossi X-ray Timing Explorer from April-July 1998. Strong quasi-periodical oscillations (QPO) with a central peak frequency around 9 Hz was detected in one observation of the series performed by the PCA/RXTE experiment. The X-ray flux from the source during the observation with QPO was maximal. The energy spectrum of XTE J1806-246 at this time was softer than for other observations. Statistically significant variability of the QPO parameters was detected, in short-term correlation with the flux variability. Fractional amplitudes of Very Low frequency Noise and the QPO component of the power density spectrum demonstrate a strong energy dependence, while other parameters do not change significantly.

Key words: stars: binaries: general – stars: flare – stars: neutron – stars: individual: XTE J1806 – 246 – X-rays: stars

Send offprint requests to: M.Revnivtsev (revnivtsev@hea.iki.rssi.ru)

© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999