Mathematics – Logic
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990crasb.311...83p&link_type=abstract
Academie des Sciences, Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de la Terre et de l'Univers (ISSN 0764-4
Mathematics
Logic
1
Photosphere, Spectrum Analysis, Stellar Composition, Stellar Spectra, Surface Roughness Effects, Solar Granulation, Solar Spectra, Spicules
Scientific paper
When solar and stellar line equivalent widths are used to determine chemical composition, the assumption of a plane-parallel or, in any case, of a spherical atmospheric structure is usually made. But in the solar atmosphere, and presumably in the atmospheres of many other stars, there are granulation effects which acts to cause a 'roughening'in the iso-tau layers. Such an optical roughening could have an effect upon equivalent widths; if this effect were found to be large, present abundance estimates would be called into question. A calculation which makes use of a phenomenological model of the roughening shows, however, that the effects are small. They very well could be larger in the case of supergiants; but then another model should be used to treat the problem properly.
Pecker Jean-Claude
Zimba Jason R.
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