Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..487t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 487-497.
Astronomy and Astrophysics
Astrophysics
23
Atmospheric Turbulence, Early Stars, Spectral Line Width, Stellar Atmospheres, Abundance, Line Shape, Star Clusters
Scientific paper
Microturbulence (xi) in the atmosphere of Arcturus was spectroscopically investigated in order to determine the nature of the atmospheric velocity field as well as its relation to the abundance analysis. The conventional method which requires a consistency of abundances from equivalent widths of both unsaturated and saturated lines leads to an evident dependence of this parameter on the used line set: xi decreases as the excitation potential or the ionization degree increases, which may be attributed to a depth dependence of this parameter that increases with height from about 0.5 km/s to about 2.2 km/s in the region of tau between 0.01 to 1. An alternative approach based on the Fourier transform of line profiles yields results in the range xi between 1.2 and 1.6 km/s, which almost correspond to the average of the values given above. An examination of the derived Fe abundances, a by-product of xi determination, confirms the existence of an appreciable non-LTE effect.
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