Abstract

Spectrophotometry of the common proper motion pairs ESO439-162/163 and ESO440-55a/55b shows that the first is formed by an m(V) = 18.8 magnetic DQ white dwarf and an m(V) = 19.8 DC9 white dwarf separated by 23 arcsec. ESO440-55a/55b has an m(V) = 20.2 red dwarf (ST = M5.1) component and a DZ7 white dwarf with m(V) = 19.3, their angular separation being 5.4 arcsec.