Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172..211d&link_type=abstract
Astronomy and Astrophysics, Vol.172, NO. 1/2/JAN, P. 211, 1987
Astronomy and Astrophysics
Astrophysics
54
Scientific paper
A search for a spectral signature of stellar granulation is made in seven stars of spectral types A, F, G, and K. Very high quality absorption line profiles have been obtained for Fe lines, using the ESO coude echelle spectrometer double-pass photoelectric scanner at a resolution λ/Δλ ≃ 200,000. Intrinsic line asymmetries are seen in all stars, with marked differences among different spectral types. The asymmetries are described by average bisectors for groups of similar spectral lines. A typical bisector amplitude is ≃ 300 m/s, a few percent of the line width. The characteristic solar granulation signature of progressively changing bisector slopes with changing line-strength is clearly indicated, in particular in the best-studied stars αCen A and Procyon. A survey of the Procyon spectral atlas is also made, and the asymmetries of 233 unblended Fe lines analyzed. This larger sample agrees very well with the photoelectric measurements and also shows additional trends, such as decreased bisector slope for lines at longer wavelengths.
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