Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316..411v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 316, May 1, 1987, p. 411-426.
Astronomy and Astrophysics
Astrophysics
62
Satellite Observation, Stellar Oscillations, X Ray Binaries, Exosat Satellite, Power Spectra, Stellar Models, X Ray Spectra
Scientific paper
Quasi-periodic oscillations (QPO) at 6 Hz were discovered from EXOSAT observations of Sco X-1 in its quiescent state by Middleditch and Priedhorsky. The authors report here on the properties of the QPO seen in earlier EXOSAT observations of Sco X-1. During these observations QPO were also detected when Sco X-1 was in an active state, in ≡20 minute dips between flares and prior to a transition to an extended quiescent state; in these cases QPO frequency varied between 10 and 20 Hz and was strongly correlated with source intensity. The transition between an active and a quiescent state was marked by variations in QPO frequency between 6 and 16 Hz which occurred on time scales of several minutes, with no intensity correlation. The authors present an oscillating thick disc obscuration model to explain the observed QPO and X-ray spectral behavior from Sco X-1.
Jansen Fabian
Parmar Arvind N.
Stella Luigi
van der Klis Michael
White Neil
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