Dwarf novae observations requested for VLA campaign

PTS

AAVSO Alert Notice 539
March 1, 2016

Dwarf novae observations requested for VLA campaign

Ms. Deanne Coppejans (PhD candidate, Radboud University Nijmegen
(Netherlands) and University of Cape Town) and colleagues have
requested AAVSO observer assistance in monitoring several northern
dwarf novae in support of their campaign to observe them with
the Very Large Array (VLA) in their ongoing radio jet research.
Their research on radio jets in dwarf novae has been discussed in
AAVSO Alert Notice 505 (https://www.aavso.org/aavso-alert-notice-505).

Observers are asked to keep an eye on RX And, U Gem, YZ Cnc,
SU UMa, and Z Cam over the next few months. High-cadence monitoring
is not needed; nightly observations are sufficient to determine
whether the source is in outburst or quiescence when a VLA
observation is taken. In this campaign, the VLA observations are not
triggered by the PI, so there is no way to predict when the VLA will
observe the sources. Observers will be notified whenever VLA
observations are obtained, but no modification of observing
instructions is expected.

Nightly visual or V observations are requested beginning now and
continuing through June 2016.

Coordinates (2000) and Ranges
Name     R.A.       Dec.            Max                     Min        Type  
RX AND   01 04 35.52  +41 17 57.8       10.8 vis        15.5 vis   ZCAM   
U GEM    07 55 05.21  +22 00 04.8       8.9     vis             15.4 V     UGSS   
YZ CNC   08 10 56.65  +28 08 33.2       10.4 vis        15.7 V     UGSU   
SU UMA   08 12 28.28  +62 36 22.3       10.9 vis        14.9 vis   UGSU   
Z CAM    08 25 13.20  +73 06 39.2       10.4 vis        13.8 vis   ZCAM   

Charts with comparison stars for these stars may be created using
the AAVSO Variable Star Plotter (VSP,http://www.aavso.org/vsp).

Please report observations to the AAVSO International Database
using the names above.

An AAVSO observing campaign discussion thread on the topic "Northern
dwarf novae campaign" has been initiated under the Campaigns &
Observation Reports forum at
https://www.aavso.org/northern-dwarf-novae-campaign.

This campaign is being followed on the AAVSO Observing Campaigns
page at https://www.aavso.org/observing-campaigns.


This AAVSO Alert Notice was prepared by Elizabeth O. Waagen.

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