Detection of Small-Amplitude Oscillations in the G-Giant HD76294 (ξ Hydrae)

Details Detection of Small-Amplitude Oscillations in the G-Giant HD76294 (ξ Hydrae) Detection of Small-Amplitude Oscillations in the G-Giant HD76294 (ξ Hydrae)

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pasj...60..219a&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.60, No.2, pp.219--222

Statistics

3

Asteroseismology, Stars: G Giants, Stars: Individual (Ζ, Hydrae), Stars: Oscillation, Stars: Statistics, Techniques: Radial Velocities

Scientific paper

We made a precise radial-velocity measurement of the G-giant ζ Hya with an iodine cell technique, and found small-amplitude oscillations. The time scale of the oscillations was 6-10 hours, in which a wavy motion was clearly seen. Their power spectrum shows a maximum peak frequency of 38.3μHz. A further period analysis with a pre-whitening procedure reveals that the four peaks, including 38.3μHz, are significant. The peak frequency of the power envelope of the oscillations is about 35μHz, which is quite low compared with a value (about 60μHz) predicted by the scaling law. We also point out that the power excess is confined to a very narrow bandwidth (40μHz) compared with previously observed G giants, ξ Hya and ɛ Oph.

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