  We have derived new very accurate abundances of the Fe-group elements Sc
through Zn (Z = 21-30) in the bright main-sequence turnoff star HD 84937, based
on high-resolution spectra covering the visible and ultraviolet spectral
regions. New or recent laboratory transition data for 14 species of seven
elements have been used. Abundances from more than 600 lines of non-Fe species
have been combined with about 550 Fe lines in HD 84937 to yield abundance
ratios of high precision. The abundances have been determined from both neutral
and ionized transitions, which generally are in agreement with each other. We
find no substantial departures from standard LTE Saha ionization balance in
this [Fe/H] = -2.32 star. Noteworthy among the abundances are: [Co/Fe] = 0.14
and [Cu/Fe] = -0.83, in agreement with past studies abundance trends in this
and other low metallicity stars; and <[Sc,Ti,V/Fe]> = 0.31, which has not been
noted previously. A detailed examination of scandium, titanium, and vanadium
abundances in large-sample spectroscopic surveys reveals that they are
positively correlated in stars with [Fe/H] < -2; HD 84937 lies at the high end
of this correlation. These trends constrain the synthesis mechanisms of
Fe-group elements. We also examine the GCE abundance trends of the Fe-group
elements, including a new nucleosynthesis model with jet-like explosion
effects.
