Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-16
Astronomy and Astrophysics
Astrophysics
24 pages, 12 figures, accepted for publication in SolPhys
Scientific paper
10.1023/B:SOLA.0000031388.64723.
The discovery of solar-like oscillations in the giant star xy Hya (G7III) 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 xi Hya we find the most likely amplitude to be ~ 2 m/s, in good agreement with theory (Houdek & Gough, 2002), and the most likely damping time to be ~ 2 days, which is much shorter than the theoretical value of 15-20 days calculated by Houdek & Gough (2002).
Aerts Christine
Bedding Tim R.
Carrier Fabien
de Ridder Joris
Frandsen Soeren
No associations
LandOfFree
Simulating stochastically excited oscillations. The mode lifetime of xi Hya does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simulating stochastically excited oscillations. The mode lifetime of xi Hya, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulating stochastically excited oscillations. The mode lifetime of xi Hya will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-585066