Abstract
BUSS observations of the profiles of two well observed spectral lines in the ultraviolet spectrum of αCMi (Procyon; F5 IV–V) are analysed with a Fourier transform method in order to determine values of various parameters of the velocity field of the upper photosphere. We find a microturbulent line-of-sight velocity componentLμ = 0.9 ± 0.4 km s−1, a macroturbulent velocity componentLM = 5.3 ± 0.2 km s−1, and a rotational velocity componentvR sini=10.0±1.2 km s−1. In these calculations a single-moded sinusoidal isotropic macroturbulent velocity function was assumed. The result appears to be sensitive to the assumed shape of the macroturbulence function: for an assumed Gaussian shape the observations can be described withvR sini=4 km s−1 andLM = 11.6 ± 2.7 km s−1. A comparison is made with other results and theoretical predictions.
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