The autocorrelation function of stellar p-mode measurements and its diagnostic properties |
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| Authors: | I W Roxburgh S V Vorontsov |
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| Institution: | Astronomy Unit, Queen Mary, University of London, Mile End Road, London E1 4NS;LESIA, Observatoire de Paris, Place Jules Janssen, 92195 Meudon, France;Institute of Physics of the Earth, B. Gruzinskaya 10, Moscow 123810, Russia |
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| Abstract: | 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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| Keywords: | methods: numerical stars: oscillations |
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