The detection of pressure oscillations on Alpha Centauri

Details The detection of pressure oscillations on Alpha Centauri The detection of pressure oscillations on Alpha Centauri

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984crasb.299...17f&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre

Physics

5

Stellar Oscillations, Stellar Spectrophotometry, Adaptive Filters, Optical Resonance, Power Spectra, Vibration Mode

Scientific paper

Optical resonance spectrophotometry was used to scan Alpha Centauri (G2V) for evidence of oscillations. Data were taken over six nights in May 1983 with a 3.6 m telescope. The results comprised the monochromatic intensity in the red region of the Na D1 and D2 lines and the total intensity at 20 A centered on the D lines. A Fourier transform analysis of the data in terms of frequency and phase revealed a 5 min period similar to that exhibited by the sun. The periodic structure appeared between 3-3.5 MHz and had a period of 80 micro-Hz, and were close in frequency and structure to solar p-modes. Implications of the discovery for analysis of convective forces and the composition of the two stars are discussed.

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