[vsnet-chat 3535] FBS 2351+228 = NSV 26158 bumf & archive images

[no name <crawl@zoom.co.uk>]

NSV 26158 is 2MASS 2353508+230918

with errors quoted of 0.13 arcsec, so this may provide slightly improved
astrometry thus

23h 53m 50.8s +23d 09' 18"

certainly a view of the 2MASS image suggests end figure 19.5" decl. is
too far north.

[Then again it may not be an improvement!]

The red(usnoA2.0)-J colour is +3.2, with blue(usno)-red(usno) of +2.0 [=
16.5 - 14.5]

Assuming this to be the quiescent value this doesn't sound very red for
a system with a red giant, especially as using a Kato formulation of
B-V=0.625[blue(usno)-red(usno)] we get B-V = +1.3, but on the other
hand, Hipparcos lists T CrB as B-V +1.34.

The J-H, H-Ks and J-Ks 2MASS colours are +0.59, +0.25 & +0.85
respectively (J = 11.35). This is a bit "flat" for a red object, and
this near infrared component of the magnitude _could_ be a _suggestion_
of circumstellar matter, rather than measuring the black body component
of the stellar flux.

The basic reference to the initial CV assumption based spectral work is:

1988Afz....28..287K: KOPYLOV I.M.,  LIPOVETSKY  V.A.,  SOMOV  N.N., 
SOMOVA
    T.A. and STEPANIAN J.A. <Astrofizika, 28, 287-296 (1988)>
    Spectral  investigations of a  group of new  cataclysmic variables
from
    the first Byurakan survey with the 6-meter telescope.

unfortunately not available online.

14 red _filtered_ USNOFS PMM server plates of 3' size centred on this
object will be available via temporary file
http://vsnet.nofs.navy.mil/tmp/fchaabyba_fch.html for probably a few hours
more [it is now 10h UT is].  Avoid non-filtered plates, and best
comparisons are between plates of same emulsion, filter type and
exposure. 

[At quiescence a plate limit star/object can be seen immediately due
south, mentioned in context of detection of symbiotic type spectra : ie
could this be contaminating in any way?]

John

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