Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..297d&link_type=abstract
Astrophysics and Space Science, vol. 84, no. 2, June 1982, p. 297-306. Research supported by the Koninklijke Nederlandse Akadem
Astronomy and Astrophysics
Astronomy
6
Binary Stars, Photosphere, Spectral Line Width, Stellar Atmospheres, Stellar Spectra, Velocity Distribution, Atmospheric Turbulence, Balloon-Borne Instruments, Fourier Transformation, Ultraviolet Astronomy, Ultraviolet Spectrometers
Scientific paper
Balloon-borne Ultraviolet Stellar Spectrometer observations of the profiles of two well observed spectral lines in the ultraviolet spectrum of Alpha CMI (Procyon; F5IV-V) are analyzed with a Fourier transform method in order to determine values of various parameters of the velocity field of the upper photosphere. A microturbulent line-of-sight velocity component of 0.9 + or - 0.4 km/s, a macroturbulent velocity component of 5.3 + or - 0.2 km/s, and a rotational velocity component of 10.0 + or - 1.2 km/s were determined. 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.
de Jager Cornelis
Neven L.
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