BARIUM; STELLAR COMPOSITION; GALACTIC EVOLUTION; LINE SPECTRA; METALLICITY; RESONANCE LINES
Abstract :
[en] The fractions of odd and even isotopes of barium in the metal-poor star HD140283 are determined from an analysis of the profile of the Ba II resonance line, taking advantage of the differences in hyperfine structure splitting between the different isotopes. Although one would expect an increased contribution of the r-process in very metal-poor stars, it is found that the isotopic ratio is very close to solar.
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
Zhao, G.; Beijing Astronomical Observatory, China
Language :
English
Title :
Barium isotopes in the very metal-poor star HD 140283
