CSS 121005:212625+201948 campaign update, July 20

Forums Variable Stars Campaign on a possible ER UMa Dwarf Nova from the Catalina Real Time Sky Survey‏ CSS 121005:212625+201948 campaign update, July 20

Jeremy Shears

This dwarf nova was in bright outburst for about 13 days from July 1 – a light curve with observations by Ian Miller, Roger Pickard, Richard Sabo, Jeremy Shears can be seen on the VSS web site here: http://www.britastro.org/vss/css_121005.htm

At the peak of the outburst it was mag 15.9, ~4 to 4.5 mags above quiescence. Time series photometry revealed humps in the light curve, but the runs weren’t really long enough to draw definitive conclusions about their period. The humps certainly looked like superhumps, although intriguingly there appeared to be more complex structure in them towards the end of the outburst

The most recent observation was on Jul 19.957 when the star was at mag 19.2 (Ian Miller).

We are now eagerly awaiting the next outburst of this frequently outbursting dwarf nova. It will almost certainly be a short, or “normal”, outburst lasting a couple of days. Continued monitoring is needed to determine how often the system goes into outburst, so please feel free to join it (you can upload your data to the VSS and/or AAVSO databases – and do let me know how you get on). In addition, further time series photometry during future long outbursts will be required.

For more details go to: http://www.britastro.org/vss/CSS%202126%20campaign_20140511%20(1).pdf

Go well!