Wandering near the red edge: photometric observations of three cool ZZ Ceti stars
Wandering near the red edge: photometric observations of three cool ZZ Ceti stars
We summarize our findings on three cool ZZ Ceti type pulsating white dwarfs. We determined eight independent modes in HS 0733+4119, of which seven are new findings. For GD 154, we detected two new eigenmodes, and the recurrence of the pulsational behaviour first observed in 1977. We discuss that GD …