Oscillation frequencies and mode lifetimes in α centauri A

Timothy R. Bedding, Hans Kjeldsen, R. Paul Butler, Chris McCarthy, Geoffrey W. Marcy, Simon J. O'Toole, Christopher G. Tinney, Jason T. Wright

Research output: Contribution to journalArticle

104 Scopus citations


We analyze our recently published velocity measurements of α 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.

Original languageEnglish (US)
Pages (from-to)380-385
Number of pages6
JournalAstrophysical Journal
Issue number1 I
StatePublished - Oct 10 2004


All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bedding, T. R., Kjeldsen, H., Paul Butler, R., McCarthy, C., Marcy, G. W., O'Toole, S. J., Tinney, C. G., & Wright, J. T. (2004). Oscillation frequencies and mode lifetimes in α centauri A. Astrophysical Journal, 614(1 I), 380-385. https://doi.org/10.1086/423484