  We present spectropolarimetric observations and modelling of 12 DQ white
dwarfs. Modelling is based on the method presented in Berdyugina et al. (2005).
We use the model to fit the C_2 absorption bands to get atmospheric parameters
in different configurations, including stellar spots and stratified
atmospheres, searching for the best possible fit. We still have problem to
solve before we can give temperature estimates based on the Swan bands alone.
