Asteroseismology of PG 1541 + 651 and BPM 31594 with TESS
Kepler, S. O.; Hermes, J. J.; Bell, Keaton J.; Uzundag, Murat; Bradley, Paul A.; Romero, Alejandra D.; Lauffer, G. R.; da Rosa, Gabriela Oliveira
Brazil, United States, Chile
Abstract
We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541 + 651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based facilities, with three and one period detected, respectively. The TESS data allowed the detection of multiple periodicities, 12 for PG 1541 + 651, and six for BPM 31594, which enables us to perform a detailed asteroseismological study. For both objects, we found a representative asteroseismic model with canonical stellar mass ~0.61M⊙ and thick hydrogen envelopes, thicker than 10-5.3M*. The detection of triplets in the Fourier transform also allowed us to estimate mean rotation periods, being ~22 h for PG 1541 + 651 and 11.6 h for BPM 31594, which is consistent with a range of values reported for other ZZ Ceti stars.