Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67...23s&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 1, June 1978, p. 23-31.
Astronomy and Astrophysics
Astrophysics
154
Abundance, Chemical Evolution, Galactic Evolution, Metals, Nuclear Fusion, Stellar Atmospheres, Aluminum, Barium, Calcium, Chemical Composition, Iron, Magnesium, Manganese, Niobium, Sodium, Vanadium, Yttrium
Scientific paper
Results are reported for an analysis of a sample of 11 halo stars, including the extremely metal-poor stars HD 84903, 184711, 128279, and 122563. High-dispersion spectra of the four cited stars are examined, the chemical composition of each star's atmosphere and the abundance of Fe I are deduced from empirical curves of growth, and errors in the abundance determinations are estimated. Attention is given to the relative abundances of elements produced by carbon burning, silicon burning, the s-process, and the r-process, as well as to the observed ratios Na/Mg, Al/Mg, Mg/Fe, V-51/Fe-56, Mn-55/Fe-56, Co-59/Fe-56, Ba/Fe, and Ba/Y. It is found that the 11 halo stars studied have, on the average, one hundredth of the solar metal abundance, that all the elements with the apparent exception of the s-process elements have roughly the same deficiency in each star, and that the initial chemical composition of an object in which nucleosynthesis occurs seems to have little effect on the abundances of the elements produced in the object. Both barium and yttrium are shown to be overly deficient in very metal-poor stars.
Spite Francois
Spite Monique
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