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2003MNRAS.345..889B - Mon. Not. R. Astron. Soc., 345, 889-896 (2003/November-1)
Cyclical period changes in the dwarf novae V2051 Oph and V4140 Sgr.
BAPTISTA R., BORGES B.W., BOND H.E., JABLONSKI F., STEINER J.E. and GRAUER A.D.
Abstract (from CDS):
We have combined our results with those in the literature to construct a diagram of the amplitude versus period of the modulation for a sample of 11 eclipsing cataclysmic variables (CVs). If the cyclical period changes are the consequence of a solar-type magnetic activity cycle in the secondary star, then magnetic activity is a widespread phenomenon in CVs, being equally common among long- and short-period systems. This gives independent evidence that the magnetic field (and activity) of the secondary stars of CVs do not disappear when they become fully convective. We also find that the fractional cycle period changes of the short-period CVs are systematically smaller than those of the long-period CVs.
Abstract Copyright: 2003 RAS
Journal keyword(s): accretion, accretion discs - binaries: eclipsing - stars: dwarf novae - stars: evolution - stars: individual: V2051 Oph - stars: individual: V4140 Sgr
Simbad objects: 13
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