A search for solar-like oscillations in Alpha Centauri A

Details A search for solar-like oscillations in Alpha Centauri A A search for solar-like oscillations in Alpha Centauri A

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..839b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 839-845.

Astronomy and Astrophysics

Astrophysics

31

Binary Stars, Solar Oscillations, Stellar Oscillations, Stellar Spectrophotometry, Data Reduction, Doppler Effect, Pixels, Power Spectra

Scientific paper

Spectrographic observations made in the course of a search for solar-like acoustic oscillations in Alpha Cen A are described. The observational method was to search for periodic Doppler-shift variations in all of the spectrum lines within the wavelength range accessible to a high-dispersion echelle spectrograph - about 30 nm centered on 427.5 nm, in this case. A search was also conducted for variations in the ratio of line core to continuum intensity, again averaged over all the available lines. No convincing oscillations were found in either case, with upper limits for typical single oscillation modes of 70 cm/s in Doppler shift and 4 x 10 to the -5th for continuum intensity variations inferred from line core intensities.

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