2008PASP..120.1103S

Measuring g-mode pulsations of isolated white dwarfs can reveal their interior properties to high precision. With a spectroscopic mass of , the DAV white dwarf HS 1824+6000 is near the transition between carbon/oxygen-core and helium-core white dwarfs, motivating our photometric search for additional pulsations from the Palomar 60-inch telescope. We confirmed (with much greater precision) the three frequencies: (363.479 sec), (320.851 sec), (286.114 sec), previously found by B. Voss and collaborators, and found an additional pulsation at (225.067 sec). These observed frequencies are similar to those found in other ZZ Ceti white dwarfs of comparable mass (e.g.). We hope that future observations of much lower-mass ZZ Ceti stars will reveal pulsational differences attributable to a hydrogen covered helium core.