[vsnet-chat 3083] Re: (fwd) Re: (fwd) Globular Variables (Greaves)

[Taichi Kato <tkato>]

Re: (fwd) Re: [vsnet-chat 3078] (fwd) Globular Variables (Greaves)

>      The general lack of accurate coordinates for the variables in globulars
> is (in my opinion) a serious lacuna in the literature.  The system of ad hoc
> x,y offsets is an anachronism inadequate for modern observing.  I'd like
> to suggest therefore that since John has started the work that he
> publish it.

    Until very recently, we usually had no way to access to Sawyer Hogg
catalog.  We had to consult many literatures before reaching particular
globular cluster variables.  The present electronic availability of
Clement's catalog is already a real progress in this field!

    This particularly applies to general variable star surveys.  I have
found, during the helping work for identifying MISAO variable candidates,
that at least one object is identified with the GC variable.  These
survey 'analyst' should try to keep the GC variable catalog at hand.
I have heard the GCVS team finds no reason not to treat these GC variables
in future; I hope their work would eventually incorporate in some form
these variables to the "official" variable star catalog.

    Similar "x,y offsets problem" resides in M31 novae (and variable stars).
The coordinates given for them in GCVS volume of extragalactic variables:
the original Rosino coodinates tend to give different values from the GCVS
Vol. 5.  Star-to-star identification using the published findling chart
would be indispensable (I presume the GCVS team must have done this enormous
work!) when trying to calculate x,y offsets to usual equatorial coordinates.

Regards,
Taichi Kato

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