[vsnet-alert 15620] QZ Ser another rebrightening!

Denis Denisenko d.v.denisenko at gmail.com
Tue Apr 16 02:01:08 JST 2013

Following [vsnet-alert 15582] I report additional unfiltered
photometry of QZ Ser from MASTER-Amur robotic telescope. Object is
showing abnormal behaviour (similar to AB Nor) in the sense that its
orbital period is ~0.083d, but the outbursts have some features more
typical for WZ Sge-type dwarf novae whose periods are 3/2 times
shorter. QZ Ser doesn't want to return to the quiescent state even one
month after the bright March outburst reported in [vsnet-alert 15480]!

QZ Ser
  20130405.633  13.61CR  MASTER-Amur
  20130405.635  13.64CR  MASTER-Amur
  20130405.636  13.67CR  MASTER-Amur
  20130406.630  14.87CR  MASTER-Amur
  20130406.631  14.83CR  MASTER-Amur
  20130406.632  14.88CR  MASTER-Amur
  20130408.630  15.92CR  MASTER-Amur
  20130408.631  15.89CR  MASTER-Amur
  20130408.632  15.88CR  MASTER-Amur
  20130411.645  15.95CR  MASTER-Amur
  20130411.646  15.95CR  MASTER-Amur
  20130411.647  15.93CR  MASTER-Amur
  20130415.637  13.45CR  MASTER-Amur
  20130415.639  13.49CR  MASTER-Amur
  20130415.640  13.60CR  MASTER-Amur

The unusual properties of AB Nor were reported by T. Kato et al.
almost ten years ago in MNRAS paper available at
http://mnras.oxfordjournals.org/content/347/3/861.full (MNRAS Vol.
347, pp. 861-872, 2004). They have noted that AB Nor (together with EF
Peg and V725 Aql) may have low mass-transfer rate comparable to WZ
Sge-type dwarf novae. QZ Ser also has a long superoutburst cycle and
appears to be another extremely interesting member of such "abnormal"
subtype of CVs.

Denis Denisenko
Member of MASTER team at SAI MSU

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