A spectroscopic survey of unstudied Luyten Half Second proper motion stars has resulted in the discovery of an unusual new magnetic white dwarf .
LHS 2534 proves to be the first magnetic DZ , showing Zeeman-split \ion Na1 and \ion Mg1 components , as well as \ion Ca1 and \ion Ca2 lines for which Zeeman components are blended .
The \ion Na1 splittings result in a mean surface field strength estimate of 1.92 MG. Apart from the magnetic field , LHS 2534 is one of the most heavily-blanketed and coolest DZ white dwarfs at T _ { eff } \sim 6 , 000 K .