Abstract
The X-ray source Cygnus X-3 was further observed by the X-ray detector onboard the COS-B satellite from November 1981 to February 1982 This brings to 220 days the total duration of observation of this source by COS-B. Preliminary results from the last observations are presented which show that:
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the source intensity is not periodically modulated with periods from 1 to 60d.
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the measured mean time of X-ray minimum of the 4.8h modulation is in accordance with a long-term ephemeris with a non-zero period derivative.
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short term fluctuations of the time of X-ray minima inside the observation are present but probably not strictly modulated with the period of ~ 19d reported from previous observations (Bonnet-Bidaud and van der Klis 1981].
The last point does not allow to confirm the hypothesis of an apsidal motion as the cause of the short-term changes of the 4.8h period.
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© 1985 D. Reidel Publishing Company
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Bonnet-Bidaud, J.H., van der Klis, M. (1985). COS-B X-Ray Observations of Cygnus X-3. In: Lamb, D.Q., Patterson, J. (eds) Cataclysmic Variables and Low-Mass X-Ray Binaries. Astrophysics and Space Science Library, vol 113. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5319-2_19
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DOI: https://doi.org/10.1007/978-94-009-5319-2_19
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8849-7
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