[vsnet-chat 4577] Re: new Tycho variables...

[Thom Gandet <tgandet@mindspring.com>]

> > A list of freshly analysed possibly variable stars from the Tycho data
> > annexes can be found at the CDS ftp site under the J/A+A/373/576
> subdirectory.
>
>                   I have searched for photometry (from GCPD) of these stars
> and I don't think that something worth can be done visually. Furthermore I
> have my doubts regarding some of them being actually variable!
> 
> HD 240464 /  9.583; 9.59, 0.30 ; 9.59, 0.31 ; 9.62, 0.32
> Doesn't seem to be...

    It warrants further observations.

    The spectral type is O9V, so the probability of its being
variable at the 0.04 magnitude level is reasonably good.  A V=10.9
star with a close color-match is within 5' of HD 240464 and would be
a good candidate comp star for CCD observers.  HD 240464 is located
in a dense part of the Galaxy.

> 
> HD 167611 / 9.45, 0.19 ; 9.450 ; 9.481 ; 9.52, 0.16
> This one looks slightly variable.

    Ditto this one.  Its spectral type is B1Iab/Ib, so it's odds-on
variable at the 0.07 magnitude level.  It, too, is in the Milky Way,
close to M-24.  There two possible comp stars of similar magnitude
and color within about 8' of HD 167611.

    Both stars have nearby, fairly rich, LONEOS fields.


Cordially,
Thom Gandet


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