Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..523p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 523-530.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Photometry, Binary Stars, Cataclysmic Variables, Dwarf Novae, Stellar Mass, Stellar Oscillations, Angular Momentum, Light Curve, Stellar Luminosity
Scientific paper
Three dwarf novae - SY Cnc, YZ Cnc, and AH Her - were observed in order to search for dwarf novae oscillations (DNOs) and quasi-periodical oscillations (QPOs) in their light curves. DNOs found in Sy Cnc at about 25 s, 22 s, and 17 s are in the range of the periodicities observed in other studies. DNOs in YZ Cnc were not seen until the present finding of the 26 s periodicity. The above DNOs have characteristics generally observed for these oscillations: periods of a few tens of seconds, high coherence, and derivatives anticorrelated with the gradient of the luminosity of the star. The period of about 60 s detected in AH Her has high coherence, and its derivative is positive on the descending branch of the light curve. Thus it might be a DNO with an unusually long period. The remaining two oscillations at about 60 s in YUZ Cnc have low coherence and therefore are QPOs.
Bernacca Pier L.
Pezzuto Stefano
Stagni Ruggero
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