Abstract
The relative abundances of Sr, Y and Zr on six Mn-type peculiar A stars have been derived from a curve-of-growth analysis. Isotope shifts of the Hg II 3984 line show that the mean atomic weight of the mercury on Mn-type stars is less than on other peculiar A stars. The nucleosynthesis of Y and Hg is discussed for the Mn-type stars on the theory that peculiar A stars were once secondaries in binary systems in which the primaries exploded as type II supernovae. During the explosions (γ,n) reactions probably formed Hg from Pb and modified the structure of the Sr-Y-Zrs-process peak. Later, protons accelerated in shock waves around the secondaries formed Y from Sr.
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