Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174p..45t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 174, Feb. 1976, p. 45P-50P.
Astronomy and Astrophysics
Astronomy
17
Ariel Satellites, Binary Stars, Light Curve, Pulsars, X Ray Stars, Doppler Effect, Eclipsing Binary Stars, Mass Transfer, Neutron Stars, Uhuru Satellite, X Ray Astronomy
Scientific paper
The 4.8-sec X-ray pulsations from Centaurus X-3 were monitored by a collimated proportional counter on board Ariel-5 between 1975 January 18-27. Analysis of the source Doppler effect shows that the pulsation period of Cen X-3 decreased by 3.70 + or - 0.04 msec during the preceding 2.3 yr. The Doppler analysis also yields updated values for the binary phase and period of Cen X-3. Phase zero occurred at JD 2442438.628 + or - 0.003 and the average heliocentric binary period between 1972 October and 1975 January was 2.087129 + or - 0.000007 days. Light curves of the 4.8-sec pulsations in the 3-9 keV band are characterized by two pronounced peaks, in contrast with the single peak profiles observed by Uhuru.
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