1998A&A...340..457M -
Astronomy and Astrophysics, volume 340, 457-462 (1998/12-2)
New limit on the P-mode oscillations of Procyon obtained by Fourier transform seismometry.
MOSSER B., MAILLARD J.P., MEKARNIA D. and GAY J.
Abstract (from CDS):
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-σ noise of the spectrum beyond 0.8mHz is as low as 0.12m/s/µHz1/2. 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 1mHz. A limit on the amplitude of the modes can be deduced, which cannot exceed 1m/s. However, the ``comb response'' exhibits the signature of a possible regular pattern with a large splitting ν0 of 53µHz, 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.
Abstract Copyright:
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Journal keyword(s):
techniques: interferometric - techniques: radial velocities - stars: individual: α CMi = Procyon - stars: oscillations
Simbad objects:
1
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