Cross correlation studies of stellar variability using two telescopes

Details Cross correlation studies of stellar variability using two telescopes Cross correlation studies of stellar variability using two telescopes

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasau...2..349e&link_type=abstract

(Astronomical Society of Australia, Annual General Meeting, 9th, Parkes, New South Wales, Australia, May 14-16, 1975.) Astronomi

Other

Atmospherics, Cross Correlation, Shot Noise, Telescopes, Variable Stars, X Ray Stars, Covariance, Noise Spectra, Scintillation, Stellar Spectrophotometry, Stochastic Processes, X Ray Sources

Scientific paper

A correlation technique for resolving rapid stellar variability and decorrelating wideband atmospheric noise is proposed whereby systematic errors may be largely eliminated and the full statistical-threshold limit achieved by simultaneously observing a suspected variable with an array of two telescopes separated by a baseline exceeding the noise correlation distance. Formulas are presented which show that the technique is capable in principle of detecting broadband flickering of the order of 0.001 magnitude and that the length of the baseline required to decorrelate atmospheric noise ranges from a few meters for scintillation noise to tens of kilometers for slower extinction and changes in sky radiance. Results are discussed for a feasibility study of the technique, carried out with two telescopes separated by a distance of 5.6 km. It is concluded that the technique could be extended to search for stochastic variability in the X-ray flux from binary and other X-ray sources.

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