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Re: GSC 540-84

Michael Koppelman wrote:
> Roughness was probably the wrong word. I agree with you that there seems 
> to be an amplitude change during some cycles. It seems to be repeating, 
> which is why I'm wondering if it is an overtone of some sort.
> 
Yup, this is what happens with the Blazhko effect.  It acts like an
amplitude modulation with period ~100x the basic pulsational period.
It is not an overtone pulsation in the traditional sense.
Look at Smith's book if you get a chance; the UM library should have
a copy.
Arne