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[vsnet-obs 397] CVC 33
- Date: Thu, 6 Apr 95 10:52:18 METDST
- To: aavso@cfa0.harvard.edu, varstars@nic.funet.fi, granslo@argo.uio.no (born granslo), j.bortle@genie.geis.com, guy@tahq.demon.co.uk (guy hurst), tkato@sasun11.kusastro.kyoto-u.ac.jp, gp@star.sr.bham.ac.uk (gary), ebroens@innet.be (broens), 73064.1123@CompuServe.COM, bill.worraker@aea.orgn.uk, nogami@kusastro.kyoto-u.ac.jp (nogami), extpasc@rz.uni-sb.de, steyaert@vvs.innet.be (steyaert), safnet@mesiob.obspm.fr (safnet), yasuto@math.ryukoku.ac.jp (takenaka), SNO@fa.gau.hu (laszlo), vsnet-obs@kusastro.kyoto-u.ac.jp (vsnet-obs), NAH01147@niftyserve.or.jp (watanabe), KFA02524@niftyserve.or.jp (yasuto)
- From: VANMUNSTER Tonny <tvm@lms.be>
- Subject: [vsnet-obs 397] CVC 33
- Mailer: Elm [revision: 70.85]
BELGIAN ASTRONOMICAL SOCIETY V.V.S. - Working Group Variable Stars
Cataclysmic Variables Circular No.33 1995, April 06
Ed.: T. Vanmunster, Walhostraat 1A, 3401 Landen, BELGIUM
Internet: tvm@lms.be TEL. 32-11-831504
P. Van Cauteren, de Borrekenslaan 54, 2630 Aartselaar, BELGIUM
Internet: pvancaut@innet.be TEL. 32-3-8774098
===================================================================
AL Com [UGWZ, 12 - 20.5]
========================
Several reports have been received informing us about an outburst of
this extremely important cataclysmic variable. Dave York, Abiquiu,
New Mexico, was the first observer to notice the current outburst.
Available observations are presented in the table below.
T. Kato, Ouda Station, Japan, emails : "The present extremely rare
outburst of AL Com will certainly provide one of the best opportunities
in revealing the nature of WZ Sge-type dwarf novae, or TOADs, to which
AL Com is suspected to belong ... Observations of superhumps or
other short-term variability (like "super Quasi Periodic Oscillations")
at the earliest stage are highly recommended."
Steve Howell, Planetary Science Institute, Arizona : "AL Com is a
verly large amplitude TOAD and suspected of being a magnetic system ...
It is highly likely to have a post outburst brightening. So do not
stop observations after it fades. Watch for a rebrightening a day
or so later, up to mag. 14 ... I'm trying to organize multi-wavelength
campaigns and so far have some photometric and some spectroscopic
observations scheduled from ground based telescopes. However, the more
the better, as weather and observing schedules are not very helpful in
terms of providing continuous coverage."
AL Com was last seen in outburst in 1975, from March 16 till June 29.
It faded to magnitude 17.3 in the middle of the outburst, but then
brightened considerably again.
-----------------------------------------------------------------------
DATE (UT) MAGN MS SEQ OBSERVER REMARKS SOURCE
------------------------------------------------------------------------
1995 04 03.804 15.7::mv Szentasko, L. 33-cm refl. VSNET
1995 04 03.840 [14.8 mv AA Vanmunster, T. 33-cm refl. VVS
1995 04 03.854 [13.9 mv AA Schmeer, P. 20-cm SCT VSNET
1995 04 03.973 [14.7 mv Poyner, G. 40-cm refl. VSNET
1995 04 04.97 [13.7 mv AA Schmeer, P. 20-cm SCT VSNET
1995 04 05.149 14.9 mv AA York, D. 45-cm refl. AAVSO
1995 04 05.600 12.7 mv AA Cragg, T. -cm refl. AAVSO
1995 04 05.799 12.4 mv Szentasko, L. 33-cm refl. VSNET
1995 04 05.830 11.8 mv AA Pietz, J. 20-cm SCT VSNET
1995 04 05.833 12.2 mv AA Schmeer, P. 20-cm SCT VSNET
KV And [UGSU, 14.6p - 22.5p]
============================
Refering to the outburst announcement in CVC 32, we received an
additional observation from Gary Poyner, Birmingham, UK :
1995 03 12.807 UT, 14.2: (G. Poyner, 0.40-m refl.);
Tonny Vanmunster