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AAVSO Special Notice #14

BZ UMa Outburst
(June 22, 2006)

Based on the following observations, BZ UMa appears to be
in outburst:

JUN 22.1986  	 V    11.36 +/- 0.02   GKA
JUN 22.8854     Unf. 11.5  (rough)    VMT

Thanks to Keith Graham (GKA) for discovering the outburst,
Tonny Vanmunster (VMT) for confirming it and Eddy Muyllaert
(MUY) for bringing it to our attention.

We need time series coverage for as long as possible. Nice,
long observing runs are very important. We are looking for
the possible emergence of quasi-periodic oscillations during
the decline and they may not last very long, so large gaps
in coverage may miss them. Outbursts are short and usually
last only 3-4 days. However, a superoutburst is not out of
the question for BZ UMa.

This is a very enigmatic CV that has thus far defied
classification, despite good coverage photometrically
and spectroscopically from both ground and space. Aim for
0.01 precision and go unfiltered if needed to obtain that
level of accuracy. Time resolution is not as important as
precision and the length of the total observing run.

The AAVSO International Database has terrific coverage of
the past 3 outbursts of BZ UMa. For a summary of those
outbursts and current knowledge of BZ UMa consult the
following poster paper by Price & Howell (2005):

http://www.aavso.org/news/price-aas.pdf (6MB)

Charts are available at:
http://www.aavso.org/cgi-bin/searchcharts3.pl?name=bz%20uma

Anyone who contributes significant data to the light curve
will be a coauthor on any paper published by AAVSO staff.

This Special Notice was compiled by: Aaron Price

Keywords:
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484