Global acoustic oscillations on Alpha Bootis

Details Global acoustic oscillations on Alpha Bootis Global acoustic oscillations on Alpha Bootis

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..595b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 595-609. Research supported by DGICYT.

Computer Science

Sound

34

Giant Stars, Kerr Magnetooptical Effect, Power Spectra, Radial Velocity, Sound Waves, Stellar Oscillations, Noise Intensity, Pulsed Radiation, Velocity Distribution

Scientific paper

A two-week time series of precise radial velocity measurements of Alpha Bootis (Arcturus) covering 7-8 hr per night is reported. The radial barycentric velocity of the star is found to be -5021 + or - 5 m/s. When data from the whole run are jointly analyzed, several equispaced peaks in the frequency appear in the range of a few microhertz, the highest amplitude being some 60 m/s at 4.3 microhertz. The most probable frequency spacing seems to be 50 microhertz, while the frequency cutoff is around 80 microhertz.

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