Oscillations in Arcturus from WIRE photometry

Details Oscillations in Arcturus from WIRE photometry Oscillations in Arcturus from WIRE photometry

2003-06-03

arxiv.org/abs/astro-ph/0306056v2

Astrophys.J. 591 (2003) L151-L154

Astronomy and Astrophysics

Astrophysics

6 pages, 1 Latex file, 4 .eps figures, 2 .sty files, ApJL, 591, L151 See erratum (astro-ph/0308424)

Scientific paper

10.1086/377211

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 amplitude spectrum has a significant excess of power at low-frequencies. The highest peak is at about 4.1 micro-Hz (2.8 d), which is in agreement with previous ground-based radial velocity studies. The variability of Arcturus can be explained by sound waves, but it is not clear whether these are coherent p-mode oscillations or a single mode with a short life-time.

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