Physics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..133l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 133-143.
Physics
15
Cataclysmic Variables, Stellar Atmospheres, Stellar Oscillations, Stellar Spectrophotometry, Dwarf Stars, Stellar Physics
Scientific paper
V834 Centauri is one of four AM Herculis objects that have been found to show optical quasi-periodic oscillations (QPOs) with periods of 1-3s. We have made extensive high speed photometry of V834 Cen over 4 yr to investigate the properties of these QPOs. The data have been used to study the coherence, color, pulse shape, and orbital phase dependence of the QPOs, and also how these properties might depend on the brightness of the object. In spite of the broad frequency distribution of the QPOs in time averaged power spectra, strong oscillations were found to have a surprisingly high coherence, of about 600 when measured over 20 s data sequences. The broader frequency distribution is shown to be mainly due to erratic variations in oscillation frequency with time. The observations also revealed a correlation between the oscillation frequency and color of the QPOs. This correlation favors an interpretation of the QPOs in terms of shock oscillations rather than Alfven wave resonances.
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