Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-01-13
Astronomy and Astrophysics
Astrophysics
Latex file (19 pages), uses aasms4.sty, 5 Postscript figures, accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/304255
Line asymmetries and shifts are a powerful tool for studying velocity fields in the stellar photospheres. Other effects, however, could also generate asymmetries blurring the information of the velocity patterns. We have studied the shifts and asymmetries induced in the profiles of spectral lines by pressure effects. The best theoretical and experimental data on line broadening and shifts caused by collisions with atomic hydrogen were used to analyze the NaI D and three CaI lines. Line bisectors of synthetic spectra computed with accurate data for the NaI and CaI lines are compared with very high resolution high signal-to-noise ratio solar spectra and indicate that pressure broadening reproduces the wings of the observed lines, but pressure shifts introduce neither asymmetries nor shifts comparable to the observed ones.
Allende Prieto Carlos
García López Ramón J.
Trujillo Bueno Javier
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