Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..325s&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 325-330.
Astronomy and Astrophysics
Astrophysics
15
Late Stars, Radial Velocity, Stellar Oscillations, Stellar Spectra, Correlation, Oxygen Spectra, Power Spectra, Telluric Lines
Scientific paper
Reticon observations of Aldebaran and Arcturus were performed to detect any minute radial velocity modulations which could characterize the convective stellar envelopes. The observing procedure consisted of referencing small apparent shifts of the detected stellar lines near the 6300 A wavelength to telluric O2 lines in the stellar spectrum. Only radial velocity changes were sought, rather than absolute radial velocities. Measurements for the radial velocities of both stars were calculated to an accuracy within 7 m/sec. A quasiperiodicity within 16 minutes of 110 minutes was found for Aldebaran, and within 28 minutes of 97 minutes for Arcturus. The possibility of the observed global oscillations being similar to the 5-min oscillations present in the solar system sun are discussed, and further measurements are recommended.
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