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The stunted outbursts of UU Aquarii are likely mass-transfer events

By R. Baptista, A. Bortoletto and R. K. Honeycutt

Abstract

We report a time-lapse eclipse mapping analysis of B-band time-series of the nova-like variable UU Aqr along a typical stunted outburst in 2002 August. Disc asymmetries rotating in the prograde sense in the eclipse maps are interpreted as a precessing elliptical disc with enhanced emission at periastron. From the disc expansion velocity a disc viscosity alpha_{hot}= 0.2 is inferred. The outburst starts with a 10-fold increase in uneclipsed light, probably arising in an enhanced disc wind; the disc response is delayed by 2 d. The results are inconsistent with the disc instability model and suggest that the stunted outburst of UU Aqr are the response of its viscous accretion disc to enhanced mass-transfer events.Comment: 4 pages, 2 postscript figures. To appear in the proceedings of "The Physics of Accreting Compact Binaries", Universal Academy Press In

Topics: Astrophysics - Solar and Stellar Astrophysics
Year: 2011
OAI identifier: oai:arXiv.org:1105.1381
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