Asteroseismology of red giants: photometric observations of Arcturus by SMEI

Neil Tarrant, William Chaplin, Yvonne Elsworth, Steven Spreckley, Ian Stevens

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32 Citations (Scopus)


We present new results on oscillations of the K1.5 III giant Arcturus (alpha Boo), from analysis of just over 2.5 yr of precise photometric observations made by the Solar Mass Ejection Imager on board the Coriolis satellite. A strong mode of oscillation is uncovered by the analysis, having frequency 3.51 +/- 0.03 mu Hz. By fitting its mode peak, we are able to offer a highly constrained direct estimate of the damping time (tau = 24 +/- 1 d). The data also hint at the possible presence of several radial-mode overtones, and maybe some non-radial modes. We are also able to measure the properties of the granulation on the star, with the characteristic time-scale for the granulation estimated to be similar to 0.50 +/- 0.05 d.
Original languageEnglish
Pages (from-to)L48-L52
JournalRoyal Astronomical Society. Monthly Notices
Publication statusPublished - 1 Nov 2007


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