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

doi:10.1086/423484

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 journal › Article › peer-review

114 Citations (SciVal)

Abstract

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 language	English (US)
Pages (from-to)	380-385
Number of pages	6
Journal	Astrophysical Journal
Volume	614
Issue number	1 I
DOIs	https://doi.org/10.1086/423484
State	Published - Oct 10 2004

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/423484

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title = "Oscillation frequencies and mode lifetimes in α centauri A",

abstract = "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.",

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T1 - Oscillation frequencies and mode lifetimes in α centauri A

AU - Bedding, Timothy R.

AU - Kjeldsen, Hans

AU - Paul Butler, R.

AU - McCarthy, Chris

AU - Marcy, Geoffrey W.

AU - O'Toole, Simon J.

AU - Tinney, Christopher G.

AU - Wright, Jason T.

PY - 2004/10/10

Y1 - 2004/10/10

N2 - 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.

AB - 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.

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JO - Astrophysical Journal

JF - Astrophysical Journal

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Oscillation frequencies and mode lifetimes in α centauri A

Abstract

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