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26 April 2024

» arxiv » 0905.0061

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VSX J074727.6+065050: a new WZ Sagittae star in Canis minor
Jeremy Shears ; Steve Brady ; Greg Bolt ; Tut Campbell ; Donald F. Collins ; Lewis M. Cook ; Timothy R. Crawford ; Robert Koff ; Tom Krajci ; Jennie McCormick ; Peter Nelson ; Joseph Patterson ; Pierre de Ponthiere ; Mike Potter ; Robert Rea ; George Roberts ; Richard Sabo ; Bart Staels ; Tonny Vanmunster ;
Date:	1 May 2009
Abstract:	We present photometry of the first reported superoutburst of the dwarf nova VSX J074727.6+065050 during 2008 January and February. At its brightest the star reached magnitude 11.4 and this was followed by a slow decline at 0.09 mag/d for 19 days, corresponding to the plateau phase. There was then a rapid decline at 1.66 mag/d to a temporary minimum at magnitude 16.6 where it stayed for 2 to 3 days after which there were six remarkable echo outbursts before the star gradually faded back towards quiescence at ~magnitude 19.5. The overall outburst amplitude was at least 8 magnitudes and it lasted more than 80 days. During the plateau phase we observed common superhumps with Psh = 0.06070(6) d, but the period increased to Psh = 0.06151(5) d coinciding with the end of the plateau phase and the onset of the rapid decline. This corresponds to a continuous period change with P^dot = +4.4(9) x 10-5. During the echo outbursts there was a superhump regime with Psh = 0.06088(49) d. Evidence is presented which is consistent with the star being a member of the WZ Sge family of dwarf novae.
Source:	arXiv, 0905.0061
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