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Bedding, Timothy R; Kjeldsen, Hans; Butler, R. Paul; McCarthy, Chris; Marcy, Geoffrey W; O’Toole, Simon J; Tinney, Christopher G; Wright, Jason T
The Astrophysical journal, 10/2004, Letnik: 614, Številka: 1Journal Article
We analyze our recently published velocity measurements of alpha Cen A. 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 = 0-3 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 days, substantially shorter than in the Sun.
