HZ Herculis, still active

Details HZ Herculis, still active HZ Herculis, still active

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127l..15d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. L15, L16.

Astronomy and Astrophysics

Astrophysics

23

Periodic Variations, Stellar Spectrophotometry, Ubv Spectra, X Ray Sources, Light Curve, Pulsars, Stellar Rotation

Scientific paper

Her X-1 has not been detected in photometric observations of HZ Herculis conducted in June 1983. It is suggested that the optical variability of the 35-day cycle is slowly decaying, while the irradiation of HZ Herculis by X-rays remains strong. This process may be related to the observed decrease in the spin-up rate of Her X-1, which may be due to an increase in magnetic braking caused by a change in disk physical parameters. These changes are not in accord with the predictions of the precessing disk model. They may instead be accounted for by a change in the physical parameters of the disk.

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