Other
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..431h&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, May 1991, p. 431-434.
Other
31
Abundance, Binary Stars, F Stars, G Stars, Lithium, Open Clusters, Astronomical Spectroscopy, Star Formation, Stellar Atmospheres, Stellar Spectra
Scientific paper
High-dispersion echelle spectra which include the Li I 6708 A line are reported for four blue stragglers. Two are field Population II stars with Fe/H near -1.4, while the other two are members of the open cluster M 67. The Li I line is not detected in the spectra of any of these four blue stragglers; consequent upper limits on the surface lithium abundances are further deduced from suitable model atmospheres. The upper limits are significantly lower than the initial lithium abundances inferred for the respective stellar populations associated with these blue stragglers. The negative results for the two metal-deficient stars may reveal the existence of a narrow 'lithium gap' along the Population II main sequence. Alternatively, some mechanism associated with the formation and evolution of halo blue stragglers may account for their reduced atmospheric lithium abundance. The negative results in M 67 argue that blue stragglers do not result from delayed star formation, and that blue stragglers do not remain near the main sequence for extended lifetimes as a result of interior mixing, unless the surfaces of such stars are also mixed.
Hobbs Lew M.
Mathieu Robert D.
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