SIMBAD references

The T_eff, log g, v sini values and abundances of some elements in the atmospheres of 7 galactic field blue stragglers (detected by Olsen E.H., 1980A&AS...39..205O) have been determined on the basis of spectra obtained with 6m telescope. The main results are: (1) Values of iron abundance for the investigated stars vary from [Fe/H]=-0.9dex to [Fe/H]=-0.3dex. A preliminary interpretation of this fact could be that field blue stragglers group consists of stars with different ages. (2) The abundances of Mg and Ca (relative to iron) exceed the solar values.These overabundances are in promising agreement with theoretical prediction of production of these elements by SNeII explosive nucleosynthesis.