The autocorrelation function of stellar p-mode measurements and its diagnostic properties

Details The autocorrelation function of stellar p-mode measurements and its diagnostic properties The autocorrelation function of stellar p-mode measurements and its diagnostic properties

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.369.1491r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 369, Issue 3, pp. 1491-1496.

Astronomy and Astrophysics

Astronomy

21

Methods: Numerical: Stars: Oscillations, Methods: Numerical, Stars: Oscillations

Scientific paper

The basic properties of acoustic wave propagation in stellar interiors can be analysed from the autocorrelation function (ACF) of intensity (or velocity) observations without measuring the resonant p-mode frequencies. We show how the strength of acoustic wave refraction in the stellar core, or forward acoustic amplitude, can be measured from a modulation in the ACF. This is the basic physical quantity which governs the so-called `small frequency separations', and its measurement from the ACF can be used for determining the small frequency separations when the data is of insufficient quality for a reliable identification of the stellar p-mode frequencies.

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