Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118...95v&link_type=abstract
Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 95-101. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
84
Dwarf Novae, Electrophotometry, Stellar Models, Variable Stars, Binary Stars, Bursts, Light Curve, Mass Transfer, Stellar Evolution
Scientific paper
Photoelectric observations of the dwarf nova VW Hyi during seven super-outbursts and nine short eruptions are reviewed. Superhump periodicities, 'late superhumps' and the beat phenomenon, and mass transfer during short eruptions are examined. A super-outburst always develops from an immediately preceding short eruption which partly masks the rise phase. Periodic superhumps appear near maximum light and can be observed for about two weeks during the bright state of the super-outburst. After decline from the plateau, a 'late superhump' appears with a lifetime of one week or more and a period similar to that of the superhumps. The late superhump's interaction with the orbital hump causes a beat phenomenon in the light curve. The mass transfer rate, always constant during quiescence and rise, is enhanced in the maximum or decline stages of some normal short eruptions. The observed behavior of VW Hyi is interpreted in terms of the disk instability model for ordinary dwarf nova eruptions, and of the eccentric disk model for super-outbursts.
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