2011/05/06 by R. Baptista, Baptista, R., A. Bortoletto +3 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysical Phenomena and Observations #FOS: Physical sciences #Gamma-ray bursts and supernovae #High-pressure geophysics and materials #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1105.1381
4 pages, 2 postscript figures. To appear in the proceedings of "The Physics of Accreting Compact Binaries", Universal Academy Press Inc
arxiv created 2011/05/06 · openalex publication_date 2011/05/06 · arxiv updated 2011/05/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 alphahot= 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.