Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..255r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 255-260.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Photometry, Light Curve, Novae, Variable Stars, White Dwarf Stars, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Rotation
Scientific paper
In 1978 and 1980 the old nova V533 Her had a 63.6 s periodic variation in its light curve. Since the periodicity was highly coherent, it was assumed that the periodicity was caused by rotation of a magnetized accreting white dwarf in the system, and consequently, V533 Her was classified as a DQ Her star. In the present paper, high-speed photometry of V533 Her obtained in 1982 is presented. Although mass transfer and accretion are still taking place, and at rates greater than their rates in 1978, the 63.6 s periodicity has disappeared. The available data on V533 Her now cast serious doubt on the magnetic rotator model for the periodicity. It is shown that the 63.6 periodicity in V533 Her was similar to periodicities in the cataclysmic variable WZ Sge. It is suggested that V533 Her should more properly be classified as a WZ Sge star, not a DQ Her star, and that the most likely candidate for a mechanism to produce the 63.6 s periodicity is pulsation of the white dwarf.
Edward Nather R.
Robinson Emma L.
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