Chernyshova I. Physico-chemical characteristics of the group of galactic disk stars with metal deficiency: the lambda Bootis type stars and field blue stragglers.

The dissertation contains the results of investigations of the parameters of atmospheres and abundances of elements of 53 stars on the basis of method of atmospheres in LTE approximation. It was found out that 19 field blue stragglers candidates have normal abundances or moderate metal deficiency. From 20 candidates in group of lambda Bootis type stars 9 do belong to it, for 5 stars additional analysis of C, N, O, S elements is necessary, 6 stars were excluded from group. It was found out that A component of visual-binary star VW Arietis belong to lambda Bootis type stars, but B component is normal F dwarf. The parameters of atmospheres and abundances of elements of 8 real lambda Bootis type stars and 4 normal dwarfs for testing were specified and supplemented. Field of use: astrophysics.