New limit on the p-mode oscillations of Procyon obtained by Fourier transform seismometry

Details New limit on the p-mode oscillations of Procyon obtained by Fourier transform seismometry New limit on the p-mode oscillations of Procyon obtained by Fourier transform seismometry

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...340..457m&link_type=abstract

Astronomy and Astrophysics, v.340, p.457-462 (1998)

Astronomy and Astrophysics

Astrophysics

23

Techniques: Interferometric, Techniques: Radial Velocities, Stars: Individual: {Et Al. }Pha Cmi = Procyon, Stars: Oscillations

Scientific paper

The Fourier transform spectrometer based at the CFH telescope was used as a stellar accelerometer in a new seismometric mode. One fringe at a selected path difference of the interferogram produced by the flux of a star through a bandpass chosen in the near infrared is continuously scanned. Its phase is measured and translated directly into velocity with an absolute calibration, providing a sensitive measurement of the Doppler signal. This paper reports the 4.5 nights observation of Procyon in February 1998 with this instrumentation. The final 1-sigma noise of the spectrum beyond 0.8 mHz is as low as 0.12 m s(-1}.muHz ({-1/2)) . Even with this noise level, in a single site observation we cannot report a firm detection of p-modes. We do not detect any significant excess in the power spectrum near 1 mHz. A limit on the amplitude of the modes can be deduced, which cannot exceed 1 m s(-1) . However, the ``comb response'' exhibits the signature of a possible regular pattern with a large splitting nu_0 of 53 mu Hz, which would indicate that a signal of stellar origin has been detected. Both values agree with theoretical predictions, but are in contradiction with claimed detection of p-modes previously reported.

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