A search for small-amplitude, acoustic, p-mode oscillations on CMi

Open Access

15 March 1995

journal article
Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society

Vol. 273 (2) , 367-375
https://doi.org/10.1093/mnras/273.2.367

Abstract

We have searched for small-amplitude, acoustic, p-mode oscillations on the F5 IV-V subgiant α CMi (HR 2943) in high-quality Doppler velocity measurements made in 1991, 1992 and 1993 with a magneto-optical-filter spectrometer. An internal precision of 0.13 m^-2 s^-2 μHz^-1 (1 σ) has been achieved in one of the 1993 data sets. Conclusive evidence for the presence of a p-mode spectrum may be established by extracting the mean first-order-half spacing 1/2Δv. Fourier analysis of the 1991 and 1992 data appears to indicate the presence of a strong concentration of periodic power. However, the analysis of substantially higher quality 1993 data fails to reveal a strong peak; we are therefore forced to conclude tentatively that we have, at present, failed to find conclusive evidence for an acoustic oscillation spectrum on α CMi.

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