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First, thank you to all the CCD and visual observers who have contributed to this campaign since 2009. With your help we have met all the original science goals, published several papers, unearthed a poorly understood group of anomalous Z Cams and whittled down the list of Z Cam suspects. 

I'm happy to report there is still plenty to do.  

All the bona fide Z Cams should be observed every night. They still have surprises in store for us and now that we have classified them unambiguously we need to maintain a historical record of their unique and interesting behavior. There are plenty of bright Z Cams that visual observers can follow throughout their range of variability. CCD observers should concentrate on Z Cams that get fainter than 15.0V.

The Z Cam List website lists all the bona fide and suspected Z Cams.




We present our wide field Halpha+N[II] observations of 15 cataclysmic variables to search for remnant nova shells. Such shells have been found around other cataclysmic variables that were hitherto not known as novae. Our candidates were selected as objects in the period regime of high-mass transfer systems that experience - at least occasionally - low mass transfer rates. The fact that we find no indication of a nova shell in any of these systems allows us to set a lower limit of 13000 years to the recurrence time of these objects.

Authors: Linda Schmidtobreick, Michael Shara, Claus Tappert, Amelia Bayo, Alessandro Ederoclite






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 20:00 UT February 28, 2015

YYYYMMDD

20150228
Z Cam

20150226
AG Aps
AT Cnc
BP CrA
TU Ind
GS Pav
V729 Sgr
V730 Sgr
SU UMa
CSS150226:094607-005602
NSV 1436


# indicates a noteworthy or unusual outburst
 
'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.

RECENT PAPERS ON CVs


For new papers on CV's see arxiv.org astro-ph


Authors: S. G. Parsons, C. Agurto-Gangas, B. T. Gaensicke, A. Rebassa-Mansergas, M. R. Schreiber, T. R. Marsh, V. S. Dhillon, S. P. Littlefair, A. J. Drake, M. C. P. Bours, E. Breedt, C. M. Copperwheat, L. K. Hardy, C. Buisset, P. Prasit, J. J. Ren


Authors: Linda Schmidtobreick, Michael Shara, Claus Tappert, Amelia Bayo, Alessandro Ederoclite


Authors: Tim O'Brien, Michael Rupen, Laura Chomiuk, Valerio Ribeiro, Michael Bode, Jennifer Sokoloski, Patrick Woudt


Spectroscopic Orbital Periods for 29 Cataclysmic Variables from the Sloan Digital Sky Survey

Authors: John R. Thorstensen, Cynthia J. Taylor, Christopher S. Peters, Julie N. Skinner, John Southworth, Boris T. Gaensicke

Authors: John R. Thorstensen, Cynthia J. Taylor, Christopher S. Peters, Julie N. Skinner, John Southworth, Boris T. Gaensicke


Authors: C.T. Britt, T.J. Maccarone, M. L. Pretorius, R.I. Hynes, P.G. Jonker, M.A.P. Torres, C. Knigge, C.O. Heinke, C.B. Johnson, D. Steeghs, S. Greiss, G. Nelemans

ASASSN-14cc: Likely Helium Analog of RZ Leonis Minoris


Authors: Taichi Kato, Franz-Josef Hambsch, Berto Monard



Authors: Stefan Huemmerich, Sebastian Otero, Patrick Tisserand, Klaus Bernhard