[vsnet-alert 25396] ASASSN-21au = ZTF20acyxwzf: violent variation

[Keisuke Isogai]

ASASSN-21au = ZTF20acyxwzf: violent variation

Tamas Tordai, Itoh-san and Kyoto U. team have reported further observations.
This object brightened to V ~ 13.4 mag on Feb. 13.09 UT, then faded to 15.2 mag
on Feb. 14.5 UT, and then brightened to 13.5 mag on Feb. 15.1 UT. No one can
predict the next behavior of this long-Porb AM CVn star candidate...

  This object has shown superhump-like variations with a likely constant period of
0.04048(1) d. The amplitude is about 0.03 mag. Dense observations are very
important, but there are no data from American longitude now.