Hercules X-1/HZ Herculis - The 35 day clock

Details Hercules X-1/HZ Herculis - The 35 day clock Hercules X-1/HZ Herculis - The 35 day clock

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..169b&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 169-174.

Physics

58

Binary Stars, Stellar Mass Accretion, Stellar Spectrophotometry, X Ray Absorption, Clocks, Mass Transfer, Periodic Variations, Precession, Radiant Flux Density, Spectrum Analysis, Stellar Models

Scientific paper

The paper demonstrates a relationship between the 35d behavior of X-ray absorption dips and turn-ons, and shows that both types of events are correlated with approximately 35d apparent precession period of the accretion disk as indicated by optical observations. This analysis leads to a tentative characterization of the noise properties of the 35d clock, and consequently provides a constraint on physical models for the clock mechanism. It is concluded that the clock is most likely to be found within the physics of the mass transfer-accretion process itself.

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