[vsnet-chat 1892] Re: [AAVSO-DIS] Cluster variables

[Taichi Kato <tkato>]

    Regarding the cluster variables, the VSOLJ has had a relatively long
history of visually observing "RV Tau" stars in globular clusters.
There have been discussions in vsnet-chat on these variables, and some
information on separate WWW pages:

    http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Miras/m2var.html
    http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Miras/m5var.html

    As they clearly show, "RV Tau" stars and long-period W Vir stars in
globular clusters are well within reach of small telescopes (I mostly made
visual observations using a 10-cm reflector).  There was at least one Mira
star reaching mag 12 (once reported as a possible nova), nova T Sco,
reaching mag 6-7 (I've heard some people have been monitoring this cluster
to check the nova recurrence).

    A recent paper in Acta Astronomica states that there is no "true"
RV Tau stars in globulars.  Could any specialist suggest on this?

Regards,
Taichi Kato

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