Solar-like oscillations in vec β Hydri: Confirmation of a stellar origin for the excess power

Details Solar-like oscillations in vec β Hydri: Confirmation of a stellar origin for the excess power Solar-like oscillations in vec β Hydri: Confirmation of a stellar origin for the excess power

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..142c&link_type=abstract

Astronomy and Astrophysics, v.378, p.142-145 (2001)

Astronomy and Astrophysics

Astrophysics

36

Stars: Oscillations, Stars: Individual: Beta Hydri, Techniques: Radial Velocities

Scientific paper

The G2 subgiant beta Hyi (HR 98) was observed with the Coralie fiber-fed echelle spectrograph on the 1.2-m Swiss telescope at La Silla in June 2000. The resulting 971 high-accuracy radial velocities exhibit an rms scatter of 2.72 m s-1 and a mean noise level in the amplitude spectrum of 0.122 m s-1. These measurements show significant excess in the power spectrum between 0.7-1.4 mHz with 0.40 m s-1 peak amplitude. Fitting the asymptotic relation to the power spectrum gives a large splitting of 58 mu Hz which is in good agreement with theoretical expectations. Our data confirm the independent detection of solar-like oscillations in beta Hyi announced by Bedding et al. (\cite{bedding}) which used the Ucles echelle spectrograph on the 3.9-m Anglo-Australian Telescope. Two independent instruments and calibration methods obtained very similar power excesses thus leaving little doubts on the stellar origin of the detected signal. Based on observations collected with the Coralie echelle spectrograph on the 1.2-m Euler Swiss telescope at La Silla Observatory, ESO Chile.

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