UV Quasiperiodic Oscillations from Hercules X-1

Details UV Quasiperiodic Oscillations from Hercules X-1 UV Quasiperiodic Oscillations from Hercules X-1

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.3907b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #39.07; Bulletin of the American Astronomical Society, Vol. 31, p.1426

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of the ultraviolet continuum of the X-ray binary system Her X-1/HZ Hercules with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope reveal quasiperiodic oscillations (QPOs) at frequencies of 8 and 50 mHz, with rms amplitudes of 10%\ of the steady flux. The observations took place when Her X-1 was in an ``anomalous low'' state in July of 1999. The QPOs are most prominent near orbital phase φ =0.5, suggesting they arise not in the accretion disk but on the X-ray heated face of the companion star, perhaps as a result of reprocessing of X-rays from the neutron star. If the frequency of the QPOs is related to the Keplerian rotation frequency in the disk, they originate 109 cm from the neutron star, near the Alfvèn shell radius.

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