Stellar seismology - Five-minute P modes detected on Alpha Centauri

Details Stellar seismology - Five-minute P modes detected on Alpha Centauri Stellar seismology - Five-minute P modes detected on Alpha Centauri

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..36...20f&link_type=abstract

ESO Messenger (ISSN 0722-6691), June 1984, p. 20-22.

Physics

3

Centaurus Constellation, Seismology, Stellar Oscillations, Stellar Spectrophotometry, Doppler Effect, Fourier Analysis, Power Spectra, Solar Oscillations, Vibration Mode

Scientific paper

A spectrophotometer was devised for detecting seismic disturbances in stellar sources. Based on the principle of optical resonance spectroscopy, the instrument is capable of 1/msec oscillation amplitude Doppler shift measurements. Twenty hours of data on Alpha Centauri covered the monochromatic intensity in the red wings of Na D1 and D2 lines and a 20 A passband of an interference prefilter used in a reference channel. Steps were taken to account for atmospheric interference and determine the harmonics using Fourier analysis. An 81.3 micro-Hz period was observed for a 2.3-3.8 mHz periodicity in the power spectrum, a result that is similar to a period detected in the Sun, thereby indicating that a 5 min p-mode may also be occurring in Alpha Centauri.

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