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Special Notice #418: RX And monitoring needed for VLA observations


July 5, 2016: Further to AAVSO Alert Notice 539, Deanne Coppejans and colleagues request optical monitoring of the Z Cam dwarf nova RX And in support of their campaign to observe it with the Very Large Array (VLA) in their ongoing radio jet research.

Deanne writes in a post to the AAVSO Forum thread on this campaign: "We are going to try and catch RX And in quiescence again in the next three weeks. The optical coverage of it is still sparse, so any observations you take of it will be extremely useful."

This thread may be followed at https://www.aavso.org/northern-dwarf-novae-campaign

Observers are asked to monitor RX And from now through at least the end of July. Observers will be notified when the VLA observations have been made and the campaign is concluded - please continue your observations until then. High-cadence monitoring is not needed; nightly observations are sufficient to determine whether RX And is in outburst or quiescence. Two observations (widely spaced) per night would be helpful.

Coordinates for RX And: R.A. 01 04 35.52 Dec. +41 17 57.8

Charts with comparison stars for RX And may be created using the AAVSO Variable Star Plotter (VSP).

Please report observations to the AAVSO International Database using the name RX AND.

This campaign is being followed on the AAVSO Observing Campaigns page.


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


It’s all about the  standstills, those episodes where the star gets stuck at a mid-point between maximum and minimum. If it doesn’t exhibit standstills it isn’t a Z Cam star.






AM Her stars in need of further investigation








Data from Catalina Real Time Survey 
Drake et al. 2009, ApJ, 696, 87

Northern CVs brighter than 17th magnitude here.

Southern CV's brighter than 17th magnitude here.



ACTIVITY AT A GLANCE

New outbursts and unusual activity reported in the last 72 hours

Last updated 13:08 UT July 28, 2016

YYYYMMDD

20160728
V516 Cyg
1RXS J022133.6+324343

20160727
V503 Cyg
V1006 Cyg
V1113 Cyg
IX Dra
V660 Her
ASASSN-13cz
ASASSN-15dm

20160726
BF Ara
V342 Cen
V803 Cen
BP Cra
V478 Sco
V729 Sgr
V730 Sgr
SY Vol
ASASSN-14cr
CRTS J045959.3-473808

# indicates a noteworthy or unusual outburst
:  indicates confirmation required
 
'Activity At A Glance' is gleaned from observations reported to AAVSO MyNewsFlash, BAAVSS-Alert, CVnet-Outburst, VSObs-share and VSNET-outburst. We sincerely thank all the observers who contribute timely observations and reports of activity to these email lists.

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