The chemical composition of the field blue stragglers.

Details The chemical composition of the field blue stragglers. The chemical composition of the field blue stragglers.

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...310..277a&link_type=abstract

Astronomy and Astrophysics, v.310, p.277-285

Astronomy and Astrophysics

Astrophysics

2

Stars: Abundances, Stars: Blue Stragglers

Scientific paper

We present the results of the spectroscopic investigation of 15 galactic field blue stragglers and one normal F-dwarf. The analysis has shown: 1) all stars are metal deficient. The mean value of [Fe/H] for 13 stars is -0.31+/-0.13 (two stars of our sample: HD54073 and HD88923 have probably stronger iron deficiency); 2) estimated (C/H) and (O/H) ratios are close to the solar values (i.e. these elements are slightly enhanced with respect to iron: [C/Fe]=~[O/Fe]=~0.3dex); 3) sodium and α-elements in the field stragglers are slightly enhanced too. Only magnesium shows a practically solar ratio: [Mg/Fe]=~0; 4) from the iron group, Sc shows solar ratio [M/Fe]. Cr and Ni are slightly overabundant; 5) the rather great age of the investigated stars estimated from their metallicity is in the contradiction with their locations in the evolutionary diagram. This problem can be eliminated by assuming that field stragglers are old objects with delayed evolution (similarly to blue stragglers of stellar clusters); 6) one of the investigated stars HD35863 (T_eff_=6700K, logg=4.0) has a rather high lithium abundance (logA_Li_=2.94), not usual for stars with such temperature.

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