Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..235f&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 235-244.
Astronomy and Astrophysics
Astrophysics
54
Eclipsing Binary Stars, Neutron Stars, Orbital Elements, X Ray Sources, Astronomical Models, B Stars, Eccentricity, Giant Stars, Mass Transfer, Stellar Rotation
Scientific paper
The long- and short-term variability of the 4.8-s pulsation and the 2.1-day orbital periods of Centaurus X-3 are studied. The pulsation period decreases over 4 yr with a fractional change of -0.00028 per yr, but with rms fluctuations of 0.0002 s. In August-September 1972, a continuous transition from speedup to slowdown was observed. The orbital period also decreases over 4 yr with decrease of approximately 8 millionths per yr, and with significant fluctuations of the order of 0.00001 day over months. The orbital eccentricity is found to be about 0.0008. The pulsation-period variability is found to be consistent with a near balance between the Alfven and corotation radii in an accretion-disk model. The orbital-period variability is interpreted in terms of tidal circularization and possible mass transfer and loss.
Fabbiano Giuseppina
Schreier Ethan J.
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