Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..154b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 154-156.
Astronomy and Astrophysics
Astrophysics
11
Cataclysmic Variables, Novae, Stellar Spectrophotometry, Light Curve, Power Spectra, Stellar Luminosity, Stellar Oscillations
Scientific paper
The results of the high-speed photometry obtained in July 1990 for the novalike object MV Lyrae at maximum light (12.5 mag) are presented. Two modulations were present simultaneously, one with the mean period of 0.l379 +/-0.0008 d and another with the mean period 3.8 d. The light variations with the 0.1379-d period had an amplitude near 4 percent and a coherence time of at least 36 cycles. The 3.8-d beat period of the 0.1379-d photometric and the 0.1336-d spectroscopic period is seen in the photometry with an amplitude of 0.15 mag in unfiltered light. Quasi-periodic oscillations have been also detected in the 'active state' with a period near 47 min and a mean amplitude of 2 percent. The general characteristics of 'coherent' and quasi-periodic oscillations are reviewed and compared. Additional long series of observations are needed to confirm the reality of this type of variability.
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