Article (Scientific journals)
A comment on systematic errors in determinations of microturbulent velocities
Magain, Pierre
1984In Astronomy and Astrophysics, 134, p. 189-192
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Keywords :
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
Publication date :
01 May 1984
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
134
Pages :
189-192
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 February 2010

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