Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..353p&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
10
Ariel 5 Satellite, Binary Stars, Eccentric Orbits, Galactic Bulge, Periodic Variations, Power Spectra, X Ray Sources, Astronomical Models, Data Reduction, Fourier Analysis, Satellite Observation
Scientific paper
Evidence for periodicities of several days in the three bright galactic bulge sources GX349+2, GX17+2, and Ser X-1 is found in Ariel V RMC data collected over four years. It is noted that, if the periodicities are confirmed and interpreted as orbital, compact binary models may still be saved by supposing that the periodicities arise from a precessing accretion disk, such as that proposed for the 35-day cycle of Her X-1; this is so because such precession gives periods an order of magnitude longer than the orbital period. None of the three pulse shapes described suggests that simple eclipse by a companion is responsible. The periodicity of GX349+2 is considered particularly interesting because of the impossibility of understanding it as a geometrical effect. Instead, some physical mechanism, such as an eccentric binary orbit or some periodic alignment within the system, is considered necessary.
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