Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..797c&link_type=abstract
Astronomy and Astrophysics, vol. 54, no. 3, Feb. 1977, p. 797-801.
Astronomy and Astrophysics
Astrophysics
33
Dwarf Stars, Giant Stars, Iron, Stellar Spectra, Subdwarf Stars, Abundance, Atmospheric Models, Chemical Composition, G Stars, Gravitational Fields, Stellar Atmospheres
Scientific paper
The intrinsic dispersion of the iron curve of growth is discussed for a subdwarf (Groombridge 1830), a dwarf (the sun), and a G 9 III giant (Epsilon Virginis). It is shown that this dispersion, which results in a splitting of the curve of growth, is due to a large scatter in the individual collisional damping constants of the lines. This scatter is largely greater than that predicted by the Van der Waals formula. The intrinsic dispersion of the curve of growth becomes larger with increasing atmospheric density of the star, and the point at which the intrinsic dispersion begins shifts for a dense subdwarf from the first turnoff up to the end of the plateau for a bright giant. If one does not take into account this phenomenon, systematic errors in the abundance determination occur, chiefly if no or only a few weak lines have been measured in a star. These errors may be as large as 0.30 dex and can alter the gravity determination.
Cayrel Giusa
Cayrel Roger
Foy Renaud
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