From: LARRY KLAES (ljk4_at_msn.com)
Date: Wed Feb 25 2004 - 16:38:03 PST
----- Original Message -----
From: aavso_at_aavso.org<mailto:aavso_at_aavso.org>
To: ljk4_at_msn.com<mailto:ljk4_at_msn.com>
Sent: Wednesday, February 25, 2004 10:51 AM
Subject: BZ UMa Outburst (AAVSO Special MyNewsFlash)
0846+58 BZ UMa appears to be in outburst, its first since December,
2002. Recent observations:
FEB 23.1924 16.27 MDW CCDV Err: 0.06
FEB 23.9215 <14.0 MUY
FEB 25.2944 11.6 SXN
FEB 25.3014 11.6 SXN
MDW MACDONALD II, WALTER J. WINCHESTER, ONTARIO, CANADA
MUY MUYLLAERT, EDDY OOSTENDE, BELGIUM
SXN SIMONSEN, MICHAEL A. IMLAY CITY, MI. USA
Precision time-series CCD observations in V are urgently requested.
Outbursts tend to be short so please observe as soon as possible and
for as long as possible. Possible phenomenon to be detected could be
of very low amplitude so please take care to make your observations
as precise as possible. Take extra good flat field images and keep
your SNR high. Please report your error/uncertainty. Observations in
V are preferred. If you have access to a B filter and a filter wheel
then consider observing in both B and V, but only if it does not cut
into your V observation time and lower its SNR.
AAVSO f-scale charts with B and V CCD data from Henden (USNO) are
BZ UMa is classified as a UG by the GCVS. However, it is suggested
Clear skies!
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: Wed Feb 25 2004 - 16:49:29 PST
available:
http://www.aavso.org/cgi-bin/searchcharts3.pl?name=bz%20uma
Latest data & light curves:
http://www.aavso.org/cgi-bin/quickquick.pl?star=bz%20uma
to be a SU UMa subtype due to its short orbital period and mass
ratio (Jurcevic et. al. PASP 05/1994). If it is a SU Uma, then
superhumps should be detected in superoutbursts and as of today,
none have been. However, some evidence of other forms of modulation
whose cause is unknown have been detected (Ringwald, BAAS 09/1990 &
Kato, IBVS #4768). It is also a bright X-ray source and it has been
suggested that this could be a type of intermediate magnetic
variable (Ishioka et al. 2002, PASJ 54, 581).
Please submit your observations to the AAVSO as soon as possible.
Aaron Price, Technical Assistant
on behalf of Elizabeth Waagen, Interim Director
and Janet A. Mattei, Director
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