Abstract
view Abstract Citations (78) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of quasi-coherent soft X-ray oscillations in U Geminorumand SS Cygni. Cordova, F. A. ; Chester, T. J. ; Mason, K. O. ; Kahn, S. M. ; Garmire, G. P. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1984 DOI: 10.1086/161844 Bibcode: 1984ApJ...278..739C Keywords: Binary Stars; Dwarf Novae; Stellar Oscillations; Variable Stars; X Ray Sources; Heao 1; Light Curve; Power Spectra; Spectral Energy Distribution; Stellar Mass Accretion; Astrophysics full text sources ADS | data products SIMBAD (3)
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