A photometric study of AM Herculis in the normal and reversed soft X-ray modes

Details A photometric study of AM Herculis in the normal and reversed soft X-ray modes A photometric study of AM Herculis in the normal and reversed soft X-ray modes

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..513m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 513-521.

Astronomy and Astrophysics

Astronomy

10

Binary Stars, Cataclysmic Variables, Light Curve, Stellar Spectrophotometry, Visible Spectrum, X Ray Spectra, Stellar Rotation, White Dwarf Stars

Scientific paper

A long-term study of the optical behaviour of AM Her is presented, covering the period between 1983 September and 1985 March. During this period the system displayed the recently discovered reversed mode of soft X-ray behaviour, as well as the already much longer known normal mode. The authors compare the optical light curves in the two modes and find them remarkably similar. Systematic displacements of the primary minima with respect to the old published ephemeris have been detected. If the minimum offsets are caused by a continuous decrease of the rotational period of the white dwarf, they indicate a period change in a time-scale of 106yr. Some possible interpretation of this phenomenon is discussed.

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