SIMBAD references

2012MNRAS.425.1479R - Mon. Not. R. Astron. Soc., 425, 1479-1485 (2012/September-2)

Kepler observations of V447 Lyr: an eclipsing U Gem cataclysmic variable.

RAMSAY G., CANNIZZO J.K., HOWELL S.B., WOOD M.A., STILL M., BARCLAY T. and SMALE A.

Abstract (from CDS):

We present the results of an analysis of Kepler data covering 1.5 yr of the dwarf nova V447 Lyr. We detect eclipses of the accretion disc by the mass donating secondary star every 3.74 h which is the binary orbital period. V447 Lyr is therefore the first dwarf nova in the Kepler field to show eclipses. We also detect five long outbursts and six short outbursts showing V447 Lyr is a U Gem-type dwarf nova. We show that the orbital phase of the mid-eclipse occurs earlier during outbursts compared to quiescence and that the width of the eclipse is greater during outburst. This suggests that the bright spot is more prominent during quiescence and that the disc is larger during outburst than quiescence. This is consistent with an expansion of the outer disc radius due to the presence of high viscosity material associated with the outburst, followed by a contraction in quiescence due to the accretion of low angular momentum material. We note that the long outbursts appear to be triggered by a short outburst, which is also observed in the super-outbursts of SU UMa dwarf novae as observed using Kepler.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS

Journal keyword(s): accretion, accretion discs - stars: dwarf novae - stars: individual: V447 Lyr - novae, cataclysmic variables

Simbad objects: 11

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