CVnet - Cataclysmic Variables Network


AAVSO Alert Notice 740
V1710 Scorpii (Nova Scorpii 2021, ASASSN-21fh)
14 April 2021

AAVSO Alert Notice 736
Nova Sagittarii 2021 (V6594 Sagittarii)
30 March 2021



 
Nova in Cassiopeia: 
V1405 Cassiopeiae Nova Cassiopeiae 2021
= PNV J23244760+6111140 = CzeV3217 (19 March 2021)

Spectroscopy and photometry requested for SS Cygni (17 February 2021)
(SS Cygni is at standstill since 3 February 2021)






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 13:45 UT on 18 April 2021

(All objects mentioned in this section are in the International Variable Star Index; additionally, VSX links have been given for selected cataclysmic variables) 

New outbursts and unusual activity reported in the last 72 hours

YYYYMMDD
 
20210418
DV Sco

20210416
HO Del (UGSU)
X Leo
CRTS J105215.3-064326

20210415
ZTF21aanehlz (= ASASSN-21ci) # (UGWZ, third rebrightening)





Current superoutbursts (since ...)
ASASSN-14ht : (20210414, UGSU:, time-resolved photometry is required)
GO Com : (20210412, UGSU)
ASASSN-21fp # (20210411, UGWZ, superhump period 0.0578(6) d
NZ Boo (20210406; UGSU, eclipsing, orbital period 0.05890947 d  (84.82964 min))
ASASSN-14bp (20210406, UGSU, superhump period 0.0723(2) d)
ASASSN-13bs  (20210404; superhump period 0.0566(83))
SU UMa (20210403)
ASASSN-21et = TCP J06154200-2756220 # (20210402, time-resolved photometry is required)
CRTS J091245.9-034916 (20210331, UGSU, time-resolved photometry is required)
MASTER OT J143550.11+592134.8 (20210331, UGSU, time-resolved photometry is required)
TT Boo (20210319, UGSU)
CRTS J043112.4-031452 (20210317, UGSU, eclipsing, orbital period 0.066030 d (95.083 min))
CRTS J120052.9-152620 (20210317, UGSU)
MASTER OT J172758.09+380021.5 (20210317, UGSU; EI Psc star?)
YZ LMi (20210315, AM CVn star)
CP Dra (20210313, UGSU)
ASASSN-17eq (20210313, UGSU)
ASASSN-21du : (20210313, follow-up observations are encouraged)
EK TrA (20210312, UGSU)
ASASSN-21dc :# (20210311, time-resolved photometry is required)
ASASSN-19dm : (20210310, UGSU:, time-resolved photometry is very urgently required)
NSV 3240 (20210309, UGSU, superhump period 0.0950(18) d, 
time-resolved photometry is encouraged)
HW Boo (20210307, UGSU)
MASTER OT J064725.70+491543.9 : (20210307, UGSU)
ZTF21aaoiaer (= ASASSN-21cv) #: (20210304, UGWZ:, rebrightenings on 20210328 and 0402)
ZTF21aanehlz (= ASASSN-21ci) # (20210224, UGWZ, rebrightenings on 20210328, 0406, 0415)
 

Z Cam-type dwarf novae at standstill
ST Cha (since ~20210309, IW And star)
SS Cyg # (since 20210203, SS Cygni dwarf nova prototype)
AT Cnc (since 20210116)
Z Cam (since 20181012)
IM Eri (20201130–20210115; IW And star)
BO Cet (20210108–20210209)
ST Cha (20201205–20201227; IW And star)


# 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 April 13, 2021

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

Yusuke Tampo, Keisuke Isogai, Naoto Kojiguchi, Hiroyuki Maehara, Kenta Taguchi, Taichi Kato, Mariko Kimura, Yasuyuki Wakamatsu, Masaaki Shibata, Daisaku Nogami, Miho Kawabata, Keiichi Maeda, Kosuke Namekata, Soshi Okamoto, Masaaki Otsuka, Burgaz Umut, Shumpei Nagoshi, Hiroshi Itoh, Tonny Vanmunster, Tamas Tordai, Geoffrey Stone, Katsura Matsumoto, Daiti Fujii, Ryota Matsumura, Momoka Nakagawa, Nodoka Takeuchi, Yuki Zenkou, Elena P. Pavlenko, Kirill A. Antonyuk, Nikolaj V. Pit, Oksana I. Antonyuk, Julia V. Babina, Aleksei V. Baklanov, Aleksei A. Sosnovskij, Sergey Yu. Shugarov, Nataly Katysheva, Drahomir Chochol, Shawn Dvorak, Pavol A. Dubovsky, Tomas Medulka, Igor Kudzej, Seiichiro Kiyota, Alexandra M. Zubareva, Alexandr A. Belinski, Natalia P. Ikonnikova, Marina A. Burlak, Yasuo Sano, Masanori Mizutani, Javier Ruiz, Roger D.pickard, Franz-josef, Hambsch, Sjoerd Dufoer, Stephen M. Brincat, Charles Galdies, Kenneth Menzies, Masayuki Moriyama, Mitsutaka Hiraga, Yutaka Maeda, Kenji Hirosawa, Masao Funada, Minoru Yamamoto




Sergei V. Antipin, Alexandra M. Zubareva, Aleksandr A. Belinski, Marina A. Burlak, Natalia P. Ikonnikova, Konstantin L. Malanchev, Matwey V. Kornilov, Egor O. Mishin

Krystian Ilkiewicz, Simone Scaringi, James M.C. Court, Thomas J. Maccarone, Diego Altamirano, Corey W. Bradshaw, Nathalie Degenaar, Matteo Fratta, Colin Littlefield, Tariq Shahbaz, Rudy Wijnands

Joseph Patterson (1), Jonathan Kemp (2), Berto Monard (3), Gordon Myers (3), Enrique de Miguel (4), Franz-Josef Hambsch (3), Paul Warhurst (5), Robert Rea (3), Shawn Dvorak (3), Kenneth Menzies (3), Tonny Vanmunster (3), George Roberts (3), Tut Campbell (3), Donn Starkey (3), Joseph Ulowetz (3), John Rock (3), Jim Seargeant (3), James Boardman (3), Damien Lemay (3), David Cejudo (3) ((1) Columbia Univ., (2) Middlebury Coll., (3) Center for Backyard Astrophysics, (4) Univ. de Huelva, (5) Univ. of Auckland)

E.J. Harvey, M.P. Redman, P. Boumis, S. Akras, K. Fitzgerald, S. Dulaimi, S.C. Williams, M.J. Darnley, M.C. Lam, 1 M. Kopsacheilli, S. Derlopa

Mariko Kimura, Keisuke Isogai, Taichi Kato, Naoto Kojiguchi, Yasuyuki Wakamatsu, Ryuhei Ohnishi, Yuki Sugiura, Hanami Matsumoto, Sho Sumiya, Daiki Ito, Kengo Nikai, Katsura Matsumoto, Sergey Yu. Shugarov, Natalia Kathysheva, Hiroshi Itoh, Pavol A. Dubovsky, Igor Kudzej, Hiroshi Akitaya, Kohei Oide, Takahiro Kanai, Chihiro Ishioka, Yumiko Oasa, Tonny Vanmunster, Arto Oksanen, Tamás Tordai, Katsuhiro L. Murata, Kazuki Shiraishi, Ryo Adachi, Motoki Oeda, Yutaro Tachibana, Seiichiro Kiyota, Elena P. Pavlenko, Kirill Antonyuk, Oksana Antonyuk, Nikolai Pit, Aleksei Sosnovskij, Julia Babina, Alex Baklanov, Koji S. Kawabata, Miho Kawabata, Tatsuya Nakaoka, Masayuki Yamanaka, Kiyoshi Kasai, Ian Miller, Stephen M. Brincat, Wei Liu, Mahito Sasada, Daisaku Nogami

Han Zhongtao, Boonrucksar Soonthornthum, Qian Shengbang, Fang Xiaohui, Wang Qishan, Zhu Liying, Dong Aijun, Zhi Qijun


Christopher Lloyd, Lewis M. Cook, Seiichiro Kiyota, Hanjie Tan, Di Hu, Wei Shi, Mi Zhang, Shenwei Zhang, Xiaowei Zhang, Jingyuan Zhao, Guoyou Sun, Xing Gao, David Boyd

D. M. Hewitt, M. L. Pretorius, P. A. Woudt, E. Tremou, J. C. A. Miller-Jones, C. Knigge, N. Castro Segura, D. R. A. Williams, R. P. Fender, R. Armstrong, P. Groot, I. Heywood, A. Horesh, A. J. van der Horst, E. Koerding, V. A. McBride, K. P. Mooley, A. Rowlinson, B. Stappers, R.A.M.J. Wijers

John R. Thorstensen, Mokhine Motsoaledi, David A. H. Buckley, Patrick Woudt, Brian Warner


M. D. Stritzinger (Aarhus), F. Taddia (Aarhus), M. Fraser (Dublin), T. M. Tauris (Aarhus), C. Contreras, S Drybye, L. Galbany, S. Holmbo, N. Morrell, A. Pastorello, M. M. Phillips, G. Pignata, L. Tartaglia, N.B. Suntzeff, J. Anais, C. Ashall, E. Baron, C. R. Burns, P. Hoeflich, E. Y. Hsiao, E. Karamehmetoglu, T. J. Moriya, G. Bock, A. Campillay, S. Castellon, C. Inserra, C. Gonzalez, P. Marples, S. Parker, D. Reichart, S. Torres-Robledo, D. R. Young

O. Segura Montero, S.H. Ramirez, J. Echevarria





Susanne M Hoffmann, Nikolaus Vogt, Philipp Protte

Taichi Kato, Yasuyuki Wakamatsu, Naoto Kojiguchi, Mariko Kimura, Ryuhei Ohnishi, Keisuke Isogai, Keito Niijima, Tomohiro Yoshitake (Kyoto U), Yuki Sugiura, Sho Sumiya, Daiki Ito, Kengo Nikai, Hanami Matsumoto, Katsura Matsumoto, Tonny Vanmunster, Franz-Josef Hambsch, Hiroshi Itoh, Julia V. Babina, Oksana I. Antonyuk, Alex V. Baklanov, Elena P. Pavlenko, Berto Monard, Shawn Dvorak

Susanne M. Hoffmann

E.Pavlenko, K. Niijima, P. Mason, N.Wells, A. Sosnovskij, K. Antonyuk, A. Simon, N. Pit, C. Littlefield, H. Itoh, S. Kiyota, T.Tordai, P. Dubovsky, T.Vanmunster, G. Stone, T. Kato, A. Sergeev, V. Godunova, E. Lyumanov, O. Antonyuk, A. Baklanov, Ju. Babina, K. Isogai, Ya. Romanyuk, V.Troianskyi, V. Kashuba

J. Casares, T. Muñoz-Darias, D. Mata Sanchez, P.A. Charles, M.A.P. Torres, M. Armas Padilla, R.P. Fender, J. Garcia-Rojas

G. J. M. Luna (1,2), T. Nelson (3), K. Mukai (4,5), J. L. Sokoloski (6,7) ((1) CONICET-Universidad de Buenos Aires, Instituto de Astronomía y Física del Espacio (IAFE), (2) Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina, (3) Department of Physics and Astronomy, University of Pittsburgh, (4) CRESST and X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, (5) Department of Physics, University of Maryland, Baltimore County, (6) Columbia Astrophysics Lab, Columbia University, (7) Large Synoptic Survey Telescope Corporation)

Bradley E. Schaefer, David Boyd, Geoffrey C. Clayton, Juhan Frank, Christopher Johnson, Jonathan Kemp, Ashley Pagnotta, Joseph O. Patterson, Miguel Rodriguez Marco, Limin Xiao










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