Rapid oscillations in SS Cygni

Astronomy and Astrophysics – Astronomy

Scientific paper

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Novae, Periodic Variations, Radiant Flux Density, Stellar Spectrophotometry, White Dwarf Stars, Light Curve, Stellar Mass Accretion, Stellar Models, Stellar Temperature

Scientific paper

High speed photometry of the dwarf nova SS Cygni during the November 1973 outburst reveals the presence of rapid oscillations over an interval of four days. The period of the oscillations ranged from a minimum of 8.96 sec to a maximum of 9.91 sec. The amplitudes of the optical pulsations are consistent with the upper limit estimated by Cardova et al. (1980), and reach a maximum at the maximum of the outburst. It is proposed that the white dwarf may be heated directly by surrounding luminous material, as by accretion. The variation of the rapid oscillation periods in SS Cyg has the same trend as AH Her (Hildebrand et al., 1980), from which it is concluded that the temperature is minimum at the peak of the outburst. Results also support the inverse relation between outburst luminosity and oscillation period as a general property of the cataclysmic variables (Nather and Robinson, 1974; Neva and Sadeh, 1978).

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