Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..422m&link_type=abstract
Astronomy Reports, Volume 47, Issue 5, p.422-429
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The non-LTE sodium abundances of 100 stars with metallicities -3<[Fe/H]<0.3 are determined using high-dispersion spectra with high signal-to-noise ratios. The sodium abundances [Na/Fe] obtained are close to the solar abundance and display a smaller scatter than values published previously. Giants (logg<3.8) with [Fe/H]<-1 do not display overabundances of sodium, and their sodium abundances do not show an anticorrelation with the oxygen abundance, in contrast to globular-cluster giants. They likewise do not show sodium-abundance variations with motion along the giant branch. No appreciable decrease in the sodium abundance was detected for dwarfs (logg>3.8) with metallicities -2<[Fe/H]<-1. The observed relation between [Na/Fe] and [Fe/H] is in satisfactory agreement with the theoretical computations of Samland, which take into account the metallicity dependence of the sodium yield and a number of other factors affecting the distribution of elements in the Galaxy during the course of its evolution.
Korotin Sergey A.
Kovtyukh Valery V.
Mishenina Tamara V.
Soubiran Caroline
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