Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..739c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 739-753. Research supported by the U.S. Department
Astronomy and Astrophysics
Astrophysics
68
Binary Stars, Dwarf Novae, Stellar Oscillations, Variable Stars, X Ray Sources, Heao 1, Light Curve, Power Spectra, Spectral Energy Distribution, Stellar Mass Accretion
Scientific paper
Using the HEAO 1 low-energy experiment, the authors have twice detected pulsations in the very soft X-ray flux of SS Cygni and once in U Gem. The pulsations were not strictly coherent; coherence time scales were deduced for the pulsations. During the first X-ray pointing at SS Cygni the observed 9 s oscillation had a coherence time of ≡30 pulse cycles. During the U Gem and second SS Cyg pointings, the decay times of the ≡27 s and ≡11 s X-ray oscillations were only one to two pulse cycles, which is of the same order as the decay times of longer period "quasi-coherent" optical pulsations detected in these stars. It is possible that the X-ray pulsations result from changes in the rate of the accretion flow.
Chester Thomas J.
Cordova France A.
Garmire Gordon P.
Kahn Steve M.
Mason Keith O.
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