Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217..146l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 146-156.
Astronomy and Astrophysics
Astrophysics
34
Cataclysmic Variables, Power Spectra, Stellar Oscillations, White Dwarf Stars, Light Curve, Stellar Magnetic Fields, Stellar Rotation
Scientific paper
The detection of one second quasi-periodic oscillations (QPO) in the Am Herculis system VV Puppis is detected. This is the fourth system found to exhibit this type of variability. VV Pup is the first of these QPO sources in which the orientation is such that the rotation of the white dwarf produces periodic eclipses of the two magnetic poles. The eclipses allow the oscillations to be localized to the accretion column at the dominating pole and to show that the size of the oscillating region is comparable to that of the cyclotron emitting region. The eclipses are also used to set an upper limit to the shock height. This limit rules out shock oscillations in the second and higher overtone modes, as responsible for the observed QPO. In addition, the oscillation period is found to be correlated with intensity. Finally, some of the implications of these results are discussed with respect to oscillation models and to models of the accretion column.
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