[vsnet-alert 25412] ASASSN-21br: rapid fading, might also be an AM CVn star

Taichi Kato tkato at kusastro.kyoto-u.ac.jp
Thu Feb 18 08:05:59 JST 2021


ASASSN-21br: rapid fading, might also be an AM CVn star

   Josch Hambsch recorded this object at 16.8 mag
on Feb. 17.  Nearly 3 mag fading in one day.

  YYYYMMDD(UT)   mag  observer
  20210212.319  <171g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210213.310  137g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210214.390  138g  (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017))
  20210216.653   139  (Rod Stubbings)
  20210217.623  <150  (Rod Stubbings)

   This object might also be an AM CVn-type outburst
just like ZTF20acyxwzf = ASASSN-21au.  If this is
the case, the object would brighten again.
Intensive time-resolved photometry is encouraged
(the orbital period is short if it is an AM CVn star).



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