We report the discovery of a new carbon rich white dwarf that was identified during a proper motion survey for cool white dwarfs based on photographic material used for the construction of the Guide Star Catalog II .
Its large proper motion ( \mu \simeq 0.48 arcsec/yr ) and faint apparent magnitude ( V \simeq 18.7 ) suggest a nearby object of low luminosity .
A low-resolution spectrum taken with the William Herschel Telescope clearly shows strong C _ { 2 } Deslandres-d ’ Azambuja and Swan bands , which identify the star as a DQ white dwarf .
The strength of the Deslandres-d ’ Azambuja bands and the depression of the continuum in the Swan-band region are signs of enhanced carbon abundance for the given T _ { eff } .
Comparison of our spectrophotometric data to published synthetic spectra suggests 6000 K < T _ { eff } < 8000 K , although further analysis with specialized synthetic models appear necessary to derive both T _ { eff } and chemical composition .
Finally , the range of spatial velocity estimated for this object makes it a likely member of the halo or thick disk population .