[vsnet-obs 42885] Re: [vsnet-chat 5841] V1149 Ori

[Thom Gandet <tgandet@mindspring.com>]

Sebastian Otero wrote:
> 
> > *  Eclipse I. Hipparcos' period (6.236 d.) can be confirmed and
> > refined to 6.2369 d. This is a cromospherically active star, so
> > EA/RS type.
> 
> Well, forget about that.
> I shouldn't jump to conclusions that easily...

  Many RS CVn stars emit X-rays and radio waves.  That seems to be
one diagnostic for RS CVn systems.  In EB/RS systems, the light curves
generally are shaped like sine ways outside of eclipse.  The max and\
min mags and phases of the sine ways move change with time.  Amplitudes
can be a couple of tenths of mags, which is at least an order of
magnitude larger than you'd expect from just pulsations.  The theory
is that the variations are caused by one or more large spots rotating
around the surface, much like the Sun's solar cycle.

   A good example of an EA/RS system is RZ Cnc.  It's period is very 
close to the ~27-day period quoted for V1149 Ori in the posting. The
spectral type of both RZ Cnc's components is of K-type giants.


Regards,
Thom

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