Modelling the Autocovariance of the Power Spectrum of a Solar-Type Oscillator - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: Asteroseismology is able to conduct studies on the interiors of solar-typestars from the analysis of stellar acoustic spectra. However, such an analysisprocess often has to rely upon subjective choices made throughout. A recurringproblem is to determine whether a signal in the acoustic spectrum originatesfrom a radial or a dipolar oscillation mode. In order to overcome this problem,we present a procedure for modelling and fitting the autocovariance of thepower spectrum which can be used to obtain global seismic parameters ofsolar-type stars, doing so in an automated fashion without the need to makesubjective choices. From the set of retrievable global seismic parameters weemphasize the mean small frequency separation and, depending on the intrinsiccharacteristics of the power spectrum, the mean rotational frequency splitting.Since this procedure is automated, it can serve as a useful tool in theanalysis of the more than one thousand solar-type stars expected to be observedas part of the Kepler Asteroseismic Investigation KAI. We apply theaforementioned procedure to simulations of the Sun. Assuming different apparentmagnitudes, we address the issues of how accurately and how precisely we canretrieve the several global seismic parameters were the Sun to be observed aspart of the KAI.



Author: T. L. Campante, C. Karoff, W. J. Chaplin, Y. P. Elsworth, R. Handberg, S. Hekker

Source: https://arxiv.org/







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