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Alert Notice 539: Dwarf novae observations requested for VLA campaign

March 1, 2016: 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.

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), Range, and Type

Name
R.A.(2000)
Dec.(2000)
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 compiled by Elizabeth O. Waagen.

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