Solar-like oscillations in α Centauri B

Hans Kjeldsen, Timothy R. Bedding, R. Paul Butler, Jørgen Christensen-Dalsgaard, Laszlo L. Kiss, Chris Mccarthy, Geoffrey W. Marcy, Christopher G. Tinney, Jason T. Wright

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

We have made velocity observations of the star α Centauri B from two sites, allowing us to identify 37 oscillation modes with l = 0-3. Fitting to these modes gives the large and small frequency separations as a function of frequency. The mode lifetime, as measured from the scatter of the oscillation frequencies about a smooth trend, is similar to that in the Sun. Limited observations of the star δ Pav show oscillations centered at 2.3 mHz, with peak amplitudes close to solar. We introduce a new method of measuring oscillation amplitudes from heavily smoothed power density spectra, from which we estimated amplitudes for α Cen α and B, β Hyi, δ Pav, and the Sun. We point out that the oscillation amplitudes may depend on which spectral lines are used for the velocity measurements.

Original languageEnglish (US)
Pages (from-to)1281-1290
Number of pages10
JournalAstrophysical Journal
Volume635
Issue number2 I
DOIs
StatePublished - Dec 20 2005

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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