Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.418..437j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 418, Issue 1, pp. 437-443.
Astronomy and Astrophysics
Astronomy
Accretion, Accretion Discs, Radiation Mechanisms: Thermal, Scattering, Stars: Binaries: Close, Stars: Neutron, Stars: Pulsars: Individual: Her X1
Scientific paper
The Galactic neutron star X-ray binary Her X-1 displays a well-known 35-day superorbital modulation in its X-ray and optical light curves. Detected across a broad energy range, the modulation is prevalent in X-rays, cycling between low and high states. The 35-day modulation is believed to be the result of the periodic occultation of the neutron star by a warped precessing accretion disc. Using optical observations of Her X-1 during both the anomalous low state (ALS) and the normal high state, it is shown that the orbital light curve of Her X-1 varies systematically over the 35-day precession cycle. The 35-day precessional profile is remarkably consistent between the ALS and normal high state of Her X-1, suggesting only a very slight change in the form of the disc warp between the two states. Comparison of optical and X-ray light curves suggests that a significant component of the X-ray flux during the ALS originates from the companion star.
Charles Phil A.
Jurua Edward
Meintjes Pieter J.
Still Martin
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