[vsnet-chat 207] variable star V11 in M2

[Taichi Kato <tkato>]

   Encouraged by the results of M5 variables, I have re-analyzed my old
visual observations of another variable in globular clusters -- M2 V11.
This star is classifed as an RV Tau-type variable star.  The observations
were done using 10-cm and 20-cm reflectors, consisting of 341 estimates
distributing between 1985 Augest and 1993 November.  Period analysis using
PDM has yield the best determined period of 66.81 days.  The phase-averaged
light curve is given at the URL:

   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Miras/m2var.html

   From my experience, this star was almost always easily seen through
a 20-cm telescope except when the Moon is located very close.  By a 10-cm
telescope, the variable was close to the limit of visibility at minimum.
M5 V42 and V84 were always clearly seen by a 10-cm telescope.
I would like to recommend observers of VZ Aqr and VY Aqr (and CV Aqr?)
to have a regular visit to this globular -- quite surprising to find
such a bright member to blink.

Regards,
Taichi Kato

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