Detecting solar-like oscillations in the giant star xi Hydrae: New prospects for asteroseismology throughout the HR-diagram

Details Detecting solar-like oscillations in the giant star xi Hydrae: New prospects for asteroseismology throughout the HR-diagram Detecting solar-like oscillations in the giant star xi Hydrae: New prospects for asteroseismology throughout the HR-diagram

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mst...........s&link_type=abstract

Master's thesis, p1-126, Aarhus Universitet

Physics

5

Stars: Red Giants, Stars: Individual: Xi Hya, Stars: Oscillations

Scientific paper

Based on single-site velocity measurements the first clear detection of solar-like oscillations in a red giant star is shown. The measured frequencies can be matched to a regular series of peaks if some frequencies are shifted by +/- 11.57 micro hertz (the daily alias). This is in good agreement with the radial modes from a pulsation model of xi Hya. However, the ambiguity of the frequencies is unclear due to a crowded power spectrum and because the mode lifetime is not known. A new high precision CCD linearity test is introduced, providing precisions on the CCD linearity at the 10 parts per million level.

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