Long term optical monitoring of the dwarf nova OQ Car has been conducted to study the previously unknown behaviour of this star system. The observations have shown OQ Car to have frequent dwarf nova outbursts and revealed the first recorded standstill of this star system. Based on this, we conclude that OQ Car is a new member of the Z Cam type dwarf novae. Authors: Rod Stubbings, Mike Simonsen We studied the background dwarf nova of KIC 11412044 in the Kepler public data and identified it with GALEX J194419.33+491257.0. This object turned out to be a very active SU UMa-type dwarf nova having a mean supercycle of about 150 d and frequent normal outbursts having intervals of 4-10 d. The object showed strong persistent signal of the orbital variation with a period of 0.0528164(4) d (76.06 min) and superhumps with a typical period of 0.0548 d during superoutbursts. Most of the superoutbursts were accompanied by a precursor outburst. All these features are unusual for this very short orbital period. We succeeded in detecting the evolving stage of superhumps (stage A superhumps) and obtained a mass ratio of 0.141(2), which is unusually high for this orbital period. We suggest that the unusual outburst properties are a result of this high mass ratio. We suspect that this object is a member of the recently recognized class of cataclysmic variables (CVs) with a stripped core evolved secondary which are evolving toward AM CVn-type CVs. The present determination of the mass ratio using stage A superhumps makes the first case in such systems. Authors: Taichi Kato (Kyoto U.), Yoji Osaki (U. of Tokyo)  AM Her stars in need of further investigation Important to gather detailed long-term light curves for the majority of these systems to better understand their nature. |  Please help support CVnet and AAVSO New outbursts and unusual activity reported in the last 72 hours Last updated 10:20 UT March 10, 2014 YYYYMMDD 20140209 V452 Cas CY UMa (rebrightening to superoutburst) 20140208 CY Lyr CI UMa 20140207 RX And AB Dra RZ LMi * indicates an unconfirmed outburst # 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: Rod Stubbings, Mike Simonsen Authors: Taichi Kato (Kyoto U.), Yoji Osaki (U. of Tokyo) Author: Augustin Skopal Authors: N.R. Deacon, D.W. Hoard, E.A. Magnier, Y.S. Jadhav, M. Huber, K.C. Chambers, H. Flewelling, K.W. Hodapp, N. Kaiser, R.P. Kudritzki, N. Metcalfe, C. Waters Authors: Tomohito Ohshima, Taichi Kato, Elena Pavlenko, Hidehiko Akazawa, Kazuyoshi Imamura, Kenji Tanabe, Enrique de Miguel, William Stein, Hiroshi Itoh, Franz-Josef Hambsch, Pavol A. Dubovsky, Igor Kudzej, Thomas Krajci, Alex Baklanov, Denis Samsonov, Oksana Antonyuk, Viktor Malanushenko, Maksim Andreev, Ryo Noguchi, Kazuyuki Ogura, Takashi Nomoto, Rikako Ono, Shin'ichi Nakagawa, Keisuke Taniuchi, Tomoya Aoki, Miho Kawabata, Hitoshi Kimura, Kazunari Masumoto, Hiroshi Kobayashi, Katsura Matsumoto, Kazuhiko Shiokawa, Sergey Yu. Shugarov, Natalia Katysheva, Irina Voloshina, Polina Zemko, Kiyoshi Kasai, Javier Ruiz, Hiroyuki Maehara, Natalia Virnina, Jani Virtanen, Ian Miller, Boyd Boitnott, Colin Littlefield, Nick James, Tamas Tordai, Fidrich Robaert, Stefono Padovan, Atsushi Miyashita Authors: Mike Simonsen, David Boyd, Bill Goff, Tom Krajci, Kenneth Menzies, Sebastian Otero, Stefano Padovan, Gary Poyner, James Roe, Richard Sabo, George Sjoberg, Bart Staels, Rod Stubbings, John Toone, Patrick Wils Authors: Mike Simonsen, Terry Bohlsen, Franz-Josef Hambsch, Rod Stubbings Authors: Jeremy J. Drake, Cecilia Garraffo, Dai Takei and Boris Gaensicke Authors: Izumi Hachisu, Mariko Kato Authors: C.J. Manser, B.T. Gaensicke Authors: Ulisse Munari, Arne Henden Author: J. Smak Gavin Ramsay (Armagh Observatory), Steve B. Howell, Matt A. Wood, Alan Smale, Thomas Barclay, Sally A. Seebode, Dawn Gelino, Martin Still, John K. Cannizzo Paula Szkody, Meagan Albright, Albert P. Linnell, Mark E. Everett, Russet McMillan, Gabrelle Saurage, Joseph Huehnerhoff, Steve B. Howell, Mike Simonsen, Nick Hunt-Walker |
