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Re: Delta Scuti variables


  Martin wrote:

> I seem to be finding large numbers of delta scuti type 
> variables in the data I am
> obtaining as part of the Daventry Variable Star Survey
> 
> http://www.icrar.org/website/daventrysurvey.htm
> 
> Are these really as common as my results seem to indicate - are they worth
> reporting and recording?

  I suggest that you read a recent paper in Astronomical Journal,
"Reclassification of ROTSE-I delta Scuti Stars with Multiband 
Photometry and Fourier Decomposition", 

     http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004AJ....128.1847J&db_key=AST&high=41d2d8d2b506958

which suggests that some stars classified as delta Scuti variables
may actually be close eclipsing binaries of the W UMa variety.

  Another good paper to read is

"HATNET Variability Survey in the High Stellar Density ``Kepler Field'' 
with Millimagnitude Image Subtraction Photometry", 

     http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004AJ....128.1761H&db_key=AST&high=41d2d8d2b506958

which finds that of the 98,000 stars monitored in one rich field,
over 1600 may be classified as "variable".  You can look at their
catalog of variable stars and estimate the fraction which might
be delta Scuti.

                                  Michael Richmond