WIRE Observations of Arcturus ( Boo)

A. Retter1, T. R. Bedding1, D. Buzasi2, H. Kjeldsen3
1 School of Physics, University of Sydney 2006, Australia
2Department of Physics, 2354 Fairchild Drive, US Air Force Academy,
3Theoretical Astrophysics Center, University of Aarhus, 8000 Aarhus C, Denmark

 

Observations on the red giant Arcturus ( Boo) obtained with the star tracker on the Wide Field Infrared Explorer (WIRE) satellite during a baseline of 19 days in 2000 July-August are analysed. The power spectrum has a significant excess of power at low-frequencies. The highest peak is at 4.1 Hz, which is in agreement with the ground-based radial velocity and photometry study of Belmonte et al. (1990a,b). The variability of Arcturus can be explained either by stellar oscillations or by granulation noise.

 
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