SIMBAD references

We present 17.36 hours of new time-series photometric observations of the variable ``hybrid'' PG 1159 star HS 2324+3944. These data allow us to demonstrate the presence of four frequencies in the light variations with evidence for more. The dominating time scale of the variability (around 35 minutes) is much longer than that of GW Vir pulsators. Binarity is not likely to cause the object's light variations. A pulsational origin of the variability seems more attractive. Recent theoretical investigations suggest that pre-white dwarf pulsations can be excited despite the presence of hydrogen in the model's driving region.