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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.










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

Last updated 09:03 UT on 20 September 2018

New outbursts and unusual activity reported in the last 72 hours

YYYYMMDD

20180918
LX And
AG Aps
SV CMi
AM Cas
GX Cas
V792 Cyg
AB Dra
WX Hyi
ASASSN-17gf
ASASSN-18rg (rebrightening)



Current superoutbursts (since ...)
V844 Her (20180907)
V1024 Per (20180907)
CY CrB # (20180818; superhump period 0.06733(9) d)
ASASSN-18td (20180818; Psh= 0.0756(4) d)
ASASSN-18sx (20180817; Psh= 0.0692(7) d)
NSV 14681 (20180814)
ASASSN-14dw (20180814)
FO And (20180812)
SY Cap (20180812)
TCP J17453768-1756253 (20180812; UGSU, time-resolved photometry required)
ASASSN-18sm (20180812)
ASASSN-18ru (20180811; superhump period 0.0601 ± 0.0003 d)
CRTS J050659.2-165932 (20180809)


Z Cam-type dwarf novae at standstill
HL CMa (since 20180514)
TZ Per (20171226 – <20180623)
IW And (~20171219 – <20180515)
NY Ser # (~20180529–20180709; UGSU; spectroscopy is required)
AT Cnc (20180202–20180508)
HL CMa (20171221–20180426) 
NY Ser # (~20180120–20180317, ~56 days; UGSU)
Z Cam (20170405–20171207, 246 days)
IW And (20170812–20170831, 19 days)
OQ Car (20160415–20170826, 498 days)


# 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.

RECENT PAPERS ON CVs

Updated 10 September 2018

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

Anna F. Pala, Linda Schmidtobreick, Claus Tappert, Boris T. Gänsicke, Andrea Mehner

G. J. M. Luna, K. Mukai, J. L. Sokoloski, T. Nelson, P. Kuin, A. Segreto, G. Cusumano, M. Jaque Arancibia, N. E. Nunez

Mariko Kimura et al

M. J. Darnley, S. Starrfield

Mariko Kimura, Keisuke Isogai, Taichi Kato, Kenta Taguchi, Yasuyuki Wakamatsu, Franz-Josef Hambsch, Berto Monard, Gordon Myers, Shawn Dvorak, Peter Starr, Stephen M. Brincat, Enrique de Miguel, Joseph Ulowetz, Hiroshi Itoh, Geoff Stone, Daisaku Nogami


Joseph Patterson et al.

Paula Szkody, Mark E. Everett, Zhibin Dai, Donald Serna-Grey

John R. Thorstensen, Frederick A. Ringwald, Cynthia J. Taylor, Holly A. Sheets, Christopher S. Peters, Julie N. Skinner, Erek H. Alper, Kathryn E. Weil

Mariko Kato (Keio Univ.), Izumi Hachisu (Univ. of Tokyo), Hideyuki Saio (Tohoku Univ.)

E. Aydi, K. L. Page, N. P. M. Kuin, M. J. Darnley, F. M. Walter, P. Mróz, D. Buckley, S. Mohamed, P. Whitelock, P. Woudt, S. C. Williams, M. Orio, R. E. Williams, A. P. Beardmore, J. P. Osborne, A. Kniazev, V. A. R. M. Ribeiro, A. Udalski, J. Strader, L. Chomiuk


Michael M. Shara, Trisha F. Doyle, Ashley Pagnotta, James T. Garland, Tod R. Lauer, David Zurek, Edward A. Baltz, Ariel Goerl, Attay Kovetz, Tamara Machac, Juan Madrid, Joanna Mikolajewska, J. D. Neill, Dina Prialnik, Doug L. Welch, Ofer Yaron

J.M Hameury & J.P Lasota

V. V. Lukin, K. L. Malanchev, N. I. Shakura, K. A. Postnov, V. M. Chechetkin, V. P. Utrobin



Authors: A. F. Pala, B. T. Gänsicke, D. Townsley, D. Boyd, M. J. Cook, D. De Martino, P. Godon, J. B. Haislip, A. A. Henden, I. Hubeny, K. M. Ivarsen, S. Kafka, C. Knigge, A. P. LaCluyze, K. S. Long, T. R. Marsh, B. Monard, J. P. Moore, G. Myers, P. Nelson, D. Nogami, R. Pickard, G. Poyner, D. E. Reichart, D. Rodriguez Perez, M. R. Schreiber, J. Shears, E. M. Sion, R. Stubbings, P. Szkody, M. Zorotovic


Liam K Hardy, Martin J McAllister, Vik S Dhillon, Stuart P Littlefair, Madelon C P Bours, Elme Breedt, Tim Butterley, Anurak Chakpor, Puji Irawati, Paul Kerry, Tom R Marsh, Steven G Parsons, Chris D J Savoury, Richard W Wilson, Patrick A Woudt















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