The Noise in the 35-D Cycle of HERCULIS-X-1

Details The Noise in the 35-D Cycle of HERCULIS-X-1 The Noise in the 35-D Cycle of HERCULIS-X-1

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..347b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 2/NOV15, P. 347, 1993

Astronomy and Astrophysics

Astronomy

12

Methods: Statistical - Binaries: Close - Stars: Individual: Her X-1 - X-Rays: Stars

Scientific paper

We calculate the power density spectrum of fluctuations in the X-ray turn-on times of Her X-1, including new data which extend the X-ray and optical flux observations to a span of over 20 yr with 221 distinct 3 5-d high-low flux cycles. If we assume that turn-on times define the period of the 35-d clock, this statistical interpretation of turn-on behaviour is consistent with a white-noise process in the first derivative of the 35-d phase fluctuations (or a random walk in clock phase). We discuss the implications of considering the 35-d clock mechanism as a noise process.

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