[vsnet-chat 4192] Re: DK CAM hipep.. THANKS!

["Sebastian Otero" <varsao@fullzero.com.ar>]

> Also DE DRA is EA but
> I've found also strange ~ 90 d cycle,
> DE DRA or its compare reddish star varies.
>
> With Best Regards,
>  Mr. Kari A. Tikkanen



Dear Kari:
                Hipparcos did not catch any eclipse of DE Draconis which is
at V= 5.72 at maximum.
The GCVS lists it as an EA/DM star based on a 1979 paper by L. Meinunger.
Amplitude is 0.16 magnitudes.
Epoch is 2442626.2861 and period is 5.2980361 days.
But using this ephemeris, no eclipse is seen by Hipparcos when it should:
2428231.60 is the predicted date. And Hipparcos found:
2448231.55    5.71V
2448231.565  5.71V

Maybe a small error in the period could have accumulated with years and this
results in a wrong prediction, but new observations are probably needed.
Maybe someone else knows something about this bright star.

The star is a B9V, a main sequence dwarf, so the 90 day cycle is probably
not for this one. Hipparcos photometry doesn't show variability of any kind.
If your comparison is HD 194298, this is probably a K5III giant
microvariable (5.68 - 5.72V). NSV 25126.

All for now.

Cheers,
Sebastian.


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