Diagnostics of the Internal Structure of Stars using the Differential Response Technique |
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Authors: | Ian Roxburgh Sergei Vorontsov |
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Affiliation: | (1) Astronomy Unit, Queen Mary, University of London, London, E1 4NS, UK;(2) Place Jules Janssen, Observatoire de Paris, 92195 Meudon, France;(3) Institute of Physics of the Earth, B Gruzinsskya 10, Moscow, 123810, Russia |
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Abstract: | We address the problem of the diagnosing the deep interior structure of stars using acoustic p-modes, and investigate the diagnostic capabilities of two complementary approaches both based on the differential response technique (Vorontsov, 1998): (a) direct calibration using a grid of evolutionary stellar models, and (b) linear and non-linear (with consecutive linearisations) inversion of low-degree frequencies. We apply this analysis to the frequencies of a model of an old 0.8M star, and to the solar frequencies obtained from BiSON measurements, using a 2-D grid of reference models of different mass and age. We explore the convergence and stability of the asteroseismic inversion, performed with the adaptive regularisation technique of Strakhov and Vorontsov (2001). |
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Keywords: | Sun: waves methods: numerical stars: oscillations |
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