[vsnet-chat 972] Periodicity in PU Vul

[Taichi Kato <tkato>]

Periodicity in PU Vul

  After reading IBVS No. 4571, I have tried whether the claimed periodicity
is detectable among visual observations.  I used 574 observations reported
to VSNET between 1994 July 2 and 1998 June 1.  The data have been first
corrected for systematic differences between observers.

*** correction ***
Code Mode  Corr   SD   Obs
 GUN      -0.02  0.01    2
 Wnm      -0.34  0.01    1
 VER       0.14  0.06    7
 VED       0.10  0.07    8
 SCW      -0.02  0.19    6
 POY       0.01  0.09  235
 Myy       0.18  0.21   31
 THO      -0.25  0.03    1
 Tny      -0.20  0.19    9
 Mkn      -0.17  0.14   18
 SNO       0.50  0.01    1
 JEN      -0.04  0.09    8
 Kat      -0.26  0.11    9
 Nmt      -0.23  0.17   10
 Wnt      -0.13  0.12   42
 GRL       0.04  0.08   77
 Has      -0.33  0.05    1
 BMU      -0.09  0.07   36
 FRF      -0.13  0.09   13
 MOE       0.20  0.07   31
 AFO      -0.08  0.05    4
 CSK       0.47  0.00    1
 Hrm       0.09  0.09   20
 BMM       0.10  0.00    1
 FID       0.02  0.04    2

   The PDM analysis of the resultant corrected data has shown a signal
around P=265 d (the strongest singal in the 100-400 d range).  The
amplitude of the signal was 0.14 mag.

Regards,
Taichi Kato

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