Re: GSC 540-84

[Doug Welch <welch@physics.mcmaster.ca>]

If you want to read the latest on statistics of RRc Blazhko's,
check out our paper:

"The MACHO Project Large Magellanic Cloud Variable-Star Inventory. IX. 
Frequency Analysis of the First-Overtone RR Lyrae Stars and the Indication 
for Nonradial Pulsations"
Astrophysical Journal, Volume 542, Issue 1, pp. 257-280
                                                
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2000ApJ...542..257A&db_key=AST

There is a similar paper for the RRab's currently in press.

Cheers,
Doug

 On Sat, 4 Oct 2003, Michael Koppelman wrote:

> I have the Smith book and have been reading it extensively. One 
> interesting tidbit is he states "In fact, it is not certain whether any 
> RRc stars exhibit the classical Blazhko effect."
> 
> The consensus on this list (so far) was that this star is probably an 
> RRc and it certainly looks like we are seeing the Blazhko effect. I'm 
> going to see if I can get a rough idea of the period of the effect on 
> this star using Fourier. I don't think Smith was saying that there 
> would necessarily be anything unusual about seeing the Blazhko effect 
> in an RRc star, only that the effect has been questioned for the fairly 
> scarce RRc stars for which this effect has been claimed.
> 
> He also states the the shortest known Blazhko cycle is on the order of 
> 11 days. I have the feeling, judging from my data, that this one could 
> be quite a bit smaller than that. We'll see I guess.
> 
> For reference:
> 
> http://www.lolife.com/astronomy/gsc540-84/gsc540-84_color_phase.jpg
> 
> Cheers,
> Michael Koppelman
> 
> 
> On Tuesday, September 9, 2003, at 11:19 AM, Arne Henden wrote:
> 
> > 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.
>