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Title: Simulating stochastically excited oscillations - The mode lifetime of xi Hya
Authors: Stello, D
Kjeldsen, H
Bedding, TR
De Ridder, Joris
Aerts, Conny
Carrier, Fabien
Frandsen, S #
Issue Date: Apr-2004
Publisher: Kluwer academic publ
Series Title: Solar physics vol:220 issue:2 pages:207-228
Abstract: The discovery of solar-like oscillations in the giant star xi Hya (G7 III) was reported by Frandsen et al. ( 2002). Their frequency analysis was very limited due to alias problems in the data set (caused by single-site observations). The extent to which the aliasing affected their analysis was unclear due to the unknown damping time of the stellar oscillation modes. In this paper we describe a simulator created to generate time series of stochastically excited oscillations, which takes as input an arbitrary window function and includes both white and non-white noise. We also outline a new method to compare a large number of simulated time series with an observed time series to determine the damping time, amplitude, and limited information on the degree of the stochastically excited modes. For. Hya we find the most likely amplitude to be similar to2 m s(-1), in good agreement with theory (Houdek and Gough, 2002), and the most likely damping time to be similar to2 days, which is much shorter than the theoretical value of 15-20 days calculated by Houdek and Gough ( 2002).
URI: 
ISSN: 0038-0938
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
# (joint) last author

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