(cba:news) AAVSO Special Notice #391: radio emission from northern dwarf novae

Joe Patterson jop at astro.columbia.edu
Tue Dec 2 21:00:48 EST 2014

I just wanted to forward this one (again??).  Not our usual mode of 
observing, but perhaps very productive.  Radiotelescopes have improved 
so much that they're capable of detecting, and maybe even *resolving*, 
little puffs of gas ejected in outburst.  But we have to look at the 
right time, and that's where the visual monitoring comes in.


-------- Original message --------
  From aavso at aavso.org
Date: 02/12/2014 22:09 (GMT+00:00)
To garypoyner at blueyonder.co.uk
Subject AAVSO Special Notice #391: Targets remaining for northern dwarf
novae campaign

AAVSO Special Notice #391
December 2, 2014
Targets Remaining in Northern Dwarf Novae Campaign

AAVSO Alert Notice 505 (http://www.aavso.org/aavso-alert-notice-505)
announced the campaign on several northern dwarf novae by Deanne
Coppejans and colleagues. This campaign, searching for radio jets
in dwarf novae, has been moving very quickly! Thanks to your
observations and timely notifications, three of the five sets of
VLA observations available for the targets have been used
on Z Cam, RX And, and YZ Cnc. The PI is extremely appreciative and
thanks you all for your excellent work. She is presently
analyzing the VLA data on these stars.

The two remaining sets of observations are being reserved for U Gem
in outburst and SU UMa in superoutburst. Please concentrate your
campaign efforts on these two targets.

Please observe these systems NIGHTLY and report all observations
as soon as possible. In the event of an outburst, please report
your observations as quickly as you can via WebObs, and also notify
Dr. Matthew Templeton and Elizabeth Waagen at AAVSO Headquarters
and Deanne Coppejans (matthewt at aavso.org, eowaagen at aavso.org,
d.coppejans at astro.ru.nl). Please also post outburst detections to
the Campaigns and Observation Reports forum

Visual magnitude estimates are a fast and effective means of
monitoring these dwarf novae. CCD observations are also useful; time
series are not required. Please reduce your frames and report your
data as soon as possible following an observing run.

Coordinates (2000) and Range
Name R.A.     Dec.   Max Min        Type   Date last outburst 2014
U Gem    07 55 05.21  +22 00 04.8 8.9 vis 15.4 V     UGSS   May 22 (2456799)
SU UMa   08 12 28.28  +62 36 22.3 10.9 vis 14.9 vis   UGSU   Jul 02

Finder charts with sequences for U Gem and SU UMa may be created
using the AAVSO Variable Star Plotter (VSP, http://www.aavso.org/vsp).

Please report your observations to the AAVSO International Database
using the names U GEM and SU UMA.

Thank you for your continued efforts on behalf of this campaign -
your observations and swift notifications are crucial to its

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

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Please support the AAVSO and its mission -- Join or donate today:

Posted by: garypoyner <garypoyner at blueyonder.co.uk>
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