Observation of Centaurus X-3 by Hakucho

Details Observation of Centaurus X-3 by Hakucho Observation of Centaurus X-3 by Hakucho

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..563m&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 15, 1983, p. 563-567.

Astronomy and Astrophysics

Astronomy

14

Binary Stars, Pulsars, Spaceborne Astronomy, X Ray Sources, Astronomical Spectroscopy, Periodic Variations

Scientific paper

The binary X-ray pulsar Cen X-3 was observed by the X-ray astronomy satellite Hakucho between 1981 March 21 - 26. A pulsation period of 4.8317231 ± 0.0000004 s and an orbital epoch of JD 2,444,686.44760 ± 0d.00005 were obtained from the pulse-timing analysis. The long-term spin-up rate in the pulsation period of Cen X-3 between 1977 and 1981 shows a decrease by a factor of 5 from that in 1975. The orbital period of 2.0871061 ± 0d.0000002 averaged between 1979 and 1981 exhibits a small but significant decrease. The present result confirms the trend of steady decrease of the orbital period. Possible mechanisms for the decrease of the pulsar spin-up rate and the decrease in the orbital period of Cen X-3 are discussed.

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