Oscillation frequencies and mode lifetimes in alpha Centauri A

Details Oscillation frequencies and mode lifetimes in alpha Centauri A Oscillation frequencies and mode lifetimes in alpha Centauri A

2004-06-21

arxiv.org/abs/astro-ph/0406471v1

Astrophys.J.614:380-385,2004

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ

Scientific paper

10.1086/423484

We analyse our recently-published velocity measurements of alpha Cen A (Butler et al. 2004). After adjusting the weights on a night-by-night basis in order to optimize the window function to minimize sidelobes, we extract 42 oscillation frequencies with l=0 to 3 and measure the large and small frequency separations. We give fitted relations to these frequencies that can be compared with theoretical models and conclude that the observed scatter about these fits is due to the finite lifetimes of the oscillation modes. We estimate the mode lifetimes to be 1-2 d, substantially shorter than in the Sun.

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