Evidence for Solar-like Oscillations in Arcturus (Alpha Boo)

Details Evidence for Solar-like Oscillations in Arcturus (Alpha Boo) Evidence for Solar-like Oscillations in Arcturus (Alpha Boo)

2002-08-28

arxiv.org/abs/astro-ph/0208518v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 Latex file, 3 .eps figures, uses 2 Kluwer .sty files (klucite.sty, klups.sty). To appear in `Asteroseismology Acros

Scientific paper

Observations of the red giant Arcturus (Alpha Boo) obtained with the star tracker on the Wide Field Infrared Explorer (WIRE) satellite during a baseline of 19 successive days in 2000 July-August are analysed. The power spectrum has a significant excess of power at low-frequencies. The highest peak is at about 4.1 micro-Hz, which is in agreement with the ground-based radial velocity and photometry study of Belmonte et al. (1990a; 1990b). The variability of Arcturus can be explained by sound waves, but it is not clear whether these are coherent p-mode oscillations.

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