Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126..325s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 2, Oct. 1983, p. 325-334. Sponsorship: Deutsche Forschungsgemeinschaf
Astronomy and Astrophysics
Astrophysics
33
Abundance, Chemical Evolution, Galactic Evolution, Galactic Nuclei, Late Stars, Stellar Atmospheres, Barium, Galactic Structure, Iron, Magnesium, Spectral Line Width, Spectrum Analysis, Stellar Evolution, Stellar Models, Stellar Temperature
Scientific paper
High-dispersion spectra of six chemically unevolved solar-type stars (spectral type F8-K2) and of the halo giant HD 122563 have been investigated by differential model atmosphere analysis relative to the sun to obtain abundances of barium, iron and magnesium. Effective temperatures inferred from red and infrared colours, and the iron ionization equilibrium were used to construct model atmospheres. A detailed spectrum synthesis of the Mg Ib-line region shows that the structure of the upper photosphere is better represented by scaled solar than by flux-constant ATLAS 6-models. Abundances deduced from equivalent widths of individual lines show a rather small scatter except for HD 122563 where a pronounced dependence of iron abundance on lower excitation potential is found, indicative of Non-LTE effects in red giants. The stars, comprising a large range in age and metallicity, show a larger-than-solar Mg/Fe-ratio, whereas Ba/Fe is smaller than in the sun, the deviation depending on the iron abundance. Both ratios correlate even closer with the eccentricity of the galactic orbit and the epicyclic energy, respectively, which suggests a correlation with age.
No associations
LandOfFree
Barium, magnesium and iron in seven chemically unevolved stars and the nuclear evolution of the galactic disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Barium, magnesium and iron in seven chemically unevolved stars and the nuclear evolution of the galactic disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Barium, magnesium and iron in seven chemically unevolved stars and the nuclear evolution of the galactic disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1191775