[vsnet-chat 5501] Re: [vsnet-outburst 4497] V601 Sco: potential identification problem

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: [vsnet-outburst 4497] V601 Sco: potential identification problem

   There have been several different sources of mis-identifications.

> Some of you might remember the case of AF Sco. That one and other
> assumed CVs were later redefined as red LPVs thanks to the monitoring
> eye of visual observers. 

   AF Sco was recognized as a LPV already well in the past, when the
IRAS PSC was released.  The same thing happened with HN Cyg.  Both of these
stars were later spectroscopically confirmed as genuine late-type stars.

> NSV 8383 (V877 Ara) was rediscoverd via outburst detections and found
> to be at a different position from the published one.

   In this case, the original disocvery material was not accurate enough
(a hand-written chart).

> 2. under the assumption that this were (had to be?) CVs, a search for
> blue stars around the vague positions must have been conducted and
> (eureka!) the true counterparts were found. USNO catalogues are very
> useful for this. In rich MW fields it is even a matter of which of those
> blue objects might be the 'one'.

   Many incorrect identifications (and many confusions!) using a search of
a blue star have been well known: V800 Aql etc.  Even a non-existent star
(V890 Aql etc.) was labeled as such.

> 3. this works well and the literature is enriched with those
> finds....until such time that the 'CV' shows up again, in striking
> colour: blue or.... red.

   Some of such confusions or mis-identifications would have been avoided
if cataclog compilers had been more careful or insightful.  People may remember
the cases of V745 Sco and V394 CrA.  On Duerbeck's nova atlas, the
identifications of the both stars are described to be confirmed with
outburst/discovery Harvard plates.  The actuality was that recurrent
outbursts of these stars occurred at far different positions!  Re-examination
of the discovery plates always confirmed the modern identification.
(Then what was going on with the original identification??)

Regards,
Taichi Kato

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