Other
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..543l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 543-556.
Other
58
Abundance, Chemical Composition, Metallic Stars, Stellar Spectrophotometry, Globular Clusters, Heavy Elements, Iron, Light Elements, Stellar Atmospheres, Stellar Gravitation, Stellar Mass, Stellar Models, Stellar Temperature
Scientific paper
Equivalent widths from high dispersion spectra in the red region are used to derive abundances of elements from oxygen to barium in 11 weak-lined stars. Values of Fe/H from 1/10 to 1/200 of the solar value are found. The ratio of oxygen-to-iron is found to vary from one to about five times the solar value. Calcium and titanium are found to be deficient in most of these metal-poor stars, confirming an odd-even effect among Si, Ca, Sc, and Ti that has been recognized in other samples of metal-deficient stars. It is found that barium shows an over-deficiency in stars with Fe/H ratio lower than -1.5, as seen in other metal-poor field stars but not in the globular clusters M15 and M92 with similarly large iron deficiencies. Since s-process production of barium probably occurs in stars of intermediate mass, with main-sequence lifetimes of 10 to the 8th to 10 to the 9th yr, this indicates that the barium-deficient halo stars may be older than the globular clusters with normal Ba/Fe ratios.
Leep Myckky E.
Wallerstein George
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