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GK Per in x-ray, radio and optical


This new image of GK Persei contains X-rays from Chandra (blue), optical data from NASA's Hubble Space Telescope (yellow), and radio data from the National Science Foundation's Very Large Array (pink). The X-ray data show hot gas and the radio data show emission from electrons that have been accelerated to high energies by the nova shock wave. The optical data reveal clumps of material that were ejected in the explosion. The nature of the point-like source on the lower left is unknown.

Read the full press release at the Chandra website






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 22:31 UT April 01, 2015

YYYYMMDD

20150331
V391 Cam
AT Cnc
SU UMa

20150330
BF Ara
V893 Sco

20150329
CP Dra
WX Hyi
HP Nor
CN Ori
HS Vir


# 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: J. Shears, B. Gaensicke, P. Rodriguez-Gil, D. Boyd, G. Darlington, I. Miller


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