Long-period radial-velocity variations of Arcturus

Details Long-period radial-velocity variations of Arcturus Long-period radial-velocity variations of Arcturus

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..147i&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Feb. 1989, p. 147-159. Research supported by the N

Astronomy and Astrophysics

Astronomy

33

Radial Velocity, Stellar Oscillations, Stellar Radiation, Subgiant Stars, Least Squares Method, Solar Oscillations

Scientific paper

Precise measurements of the radial velocity of Arcturus were obtained on 43 occasions between 1981 and 1985. The measurements show a 500 m/s range, confirming the radial velocity variability of Arcturus. Multiperiod models which give a good representation of the velocities are derived using a least-squares technique. The models also fit the velocities of Smith et al. (1987). It is suggested that the small-amplitude short-period components of the models could be analogous to the solar five-minute oscillations. The best-fitting models require the largest-amplitude component to have a period of at least 640 days.

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