ERROR ANALYSIS; MAIN SEQUENCE STARS; STELLAR SPECTRA; TURBULENCE; LINE SPECTRA; MICROPULSATIONS; SOLAR SPECTRA; SPECTRAL LINE WIDTH
Abstract :
[en] It is shown that the usual method of microturbulent velocity determination from the "abundance versus equivalent width" plot leads to a systematic overestimate of the microturbulent velocity when the observd equivalent widths are affected by random errors. This overestimate is due to the correlation between errors in observed equivalent widths and in line abundances. This error rises rapidly with decreasing quality of the observational material and may be avoided by using theoretical equivalent widths instead of observed ones as abscissa of the "abundance versus equivalent width" plot.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
A comment on systematic errors in determinations of microturbulent velocities