(cba:news) Re: AB Nor superoutburst (fwd)
jop at astro.columbia.edu
Sun Apr 9 20:08:28 EDT 2000
As some of you know, Stan Walker has identified a new SU UMa star in
superoutburst - AB Nor. Here is his report from last night. This is
definitely a good southern target right now. For borealites, fire
at will on BC UMa and the new X-ray transient in UMa.
Some quite beautiful data coming in on BC UMa. Ask, and I'll send it.
Been an amazing year for UMa.
In rather difficult conditions on April 9.35 - 9.50UT I obtained another 4
hours of CCD measures of AB Normae. There is a definite superhump at JD
2451643.924. The star was declining from a hump at .851 when observations
began and rising to, or at a peak, at .002 when cloud finally closed in.
These define a period around 0.078 to 0.079 (coincidentally similar to VW
and WX Hydri). The amplitude appeared smaller at ~0.3 magnitudes but the
humps still have a sharp rise with some structure on the decline.
Brightness outside the superhumps is similar to the previous night.
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