[vsnet-alert 3325] (fwd) A blue variable object

[Berto Monard <Lagmonar@csir.co.za>]

Dear Taichi,

Thanks for identifying it as an IRAS source. 
But I wonder how both USNO measures could be wrong about the colour of
this object. If it is a SR or Mira variable it ought to be red in
which case it's surprising that all surrounding stars are much redder
still... 

Regards,

Berto 

>>> Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> 08/04 10:13 AM >>>
Re: (fwd) A blue variable object

> I hope someone can help me out identifying the true nature of a blue
> variable object in the Southern sky.
> Astrometrically it coincides with USNO-A2.0  0375-20129883 at (2000)
> 14 08 34.9 -47 57 16
> It is not listed in any of the Blue/UV/X catalogues accessible via
> 'Vizier' (Rosat, Einstein, IUE etc...)
>  
> My visual observations so far: 
> June-July 1999:  Mag = 12.8 on several occasions
> 31 July 1999: Mag = 13.8
> 3 Aug 1999: Mag = 13.9

   This object coincides with the following IRAS source!  Apparently
it
should be a red variable rather than a blue variable.  The large error
in
USNO color may have resulted from poor color cailbration.

GSC8268.172 140834.85 -475716.5 (2000.0) 13.18 0
GSC8268.172 140834.85 -475716.5 (2000.0) 13.31 0
USNO0375.20247697 140834.858 -475716.77 (2000.0) 14.1 12.7
IRAS14053-4743 140522.9 -474306 (1950.0)
    F12=0.91  F25=0.48  F60=0.40L F100=6.31L
    VAR=24 LRS=-1
 possibly IIIa: variable star with more evolved O-rich c.s. shell
 or VIb: variable star with relatively hot dust close to
      the star and relatively cold dust at large distance
      may be O-rich
 or VII: variable star with more evolved C-rich circumstellar shell
140835.1 -475718 (2000.0) FSC14053-4743 0.915 0.416 0.377L 3.982L
140835.3 -475718 (2000.0) IRAS14053-4743 0.920 0.456 0.400L 6.382L 24%
140835.3 -475718 (2000.0) SSC14053-4743 0.920 0.456 0.400L 6.382L

Regards,
Taichi Kato

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