The 35 day cycle of HER X-1: Quality of the clock mechanism

Details The 35 day cycle of HER X-1: Quality of the clock mechanism The 35 day cycle of HER X-1: Quality of the clock mechanism

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8715155o&link_type=abstract

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Physics

Binary Stars, Neutron Stars, Periodic Variations, Stellar Models, Stellar Radiation, X Ray Sources, Autoregressive Processes, Stellar Rotation, Time Series Analysis

Scientific paper

The quality of the clock in the model of the 35 day cycle of Her X-1 is examined using data which extends the coverage to a span of 142 turnons. Autoregressive time series methods are applied to model the data. It is concluded that, in addition to the poor quality clock models with white period noise, an alternative possibility exists which implies that the intrinsic clock is good and that the turnon phase fluctuations can be modelled with white phase noise plus an integrating filter with 1.5 to 7 yr timescale. Arguments that associate this timescale with the mass transfer process from HZ Her are presented.

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