Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..386..397m&link_type=abstract
The 13th international conference on spectral line shapes. AIP Conference Proceedings, Volume 386, pp. 397-410 (1997).
Computer Science
1
Line Shapes, Widths, And Shifts, Abundances, Chemical Composition, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
While most stars have a chemical composition similar to that of the Sun, some 10% of those more massive than the Sun have large anomalies of some chemical elements. Many of those anomalies are now believed to be caused by diffusion in the presence of selective radiative acceleration. Those chemical species that absorb more of the outgoing photons are dragged by them to the stellar surface. Line widths play a double role. One needs a good knowledge of them to determine the abundance anomalies from the observed stellar spectra. One also needs them to evaluate precisely the radiative accelerations of all chemical species that are abundant enough to have saturated lines and to determine how blends modify the radiative accelerations. The effect of line widths will be quantitatively analyzed in a number of stellar objects. The approximations currently used will be reviewed and the need for improvements discussed.
Michaud Georges
Richer Jacques
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