Volume 506, Number 1, October IV 2009
The CoRoT space mission: early results
|Page(s)||435 - 444|
|Published online||02 July 2009|
Narrow frequency-windowed autocorrelations as a diagnostic of solar-like stars
Queen Mary University of London, Astronomy Unit, Mile End Road, London E1 4NS, UK e-mail: I.W.Roxburgh@qmul.ac.uk
2 LESIA, Observatoire de Paris, Place Jules Janssen, 92195 Meudon, France
Accepted: 17 June 2009
Aims. This paper investigates the diagnostic potential of narrow, frequency-windowed autocorrelation as a tool for probing the properties of solar-like oscillating stars when the determination of individual frequencies is impossible or is subject to large uncertainties, and when mode identification is difficult.
Methods. I use theoretical analysis including phase-shifts, modelling, and data analysis.
Results. Narrow-windowed autocorrelation of a time series can reveal the variation with frequency of the large separations and the half large separations , thus helping with mode identification. This technique is applied to the CoRoT p-mode oscillators HD 49933, HD 175726, HD 181420, and HD 181906. Theoretical analysis and modelling are presented to illustrate the technique.
Key words: stars: oscillations / methods: analytical / methods: data analysis
© ESO, 2009
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