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

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172...79o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 79-84.

Astronomy and Astrophysics

Astrophysics

32

Mass Transfer, Stellar Models, Time Series Analysis, Variable Stars, X Ray Binaries, Autoregressive Processes, Visible Spectrum, White Noise, X Ray Spectra

Scientific paper

The quality of the clock appears to be an important element of the model that can explain the 35 day cycle of Her X-1. This question is reexamined in the light of new data which extends the coverage to a span of 142 turn-ons. In particular, 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 turn-on phase fluctuations can be modelled with white phase noise plus an integrating filter with about 1.5 to 7 year timescale. Arguments are presented that associate this timescale with the mass transfer process from HZ Her.

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