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 \langle [ Sc , Ti , V/Fe ] \rangle = + 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 .