BPM 24754: A new southern ZZ Ceti star
Kepler, Souza Oliveira
Costa, Andrea F Murillo
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We report the discovery of a new long-period ZZ Ceti star through the analysis of photometric time series gathere on 7 nights between 1995 and 1996. The light curve displays a periodic variation with a period of ∼ 18 min in white light and the frequency analysis reveals a low frequency peak at ∼ 0.92 mHz with an amplitude varying from 0.007 to 0.025 mag present every night. BPM 24754 is the 28th known ZZ Ceti star and it has the second longest period. We have also determined its atmospheric parameters using line prolife fitting and its mass using white dwarf evolutionary models. BPM 24754 has Teff = 12,900 ± 320 K, log g = 8.04 ± 0.08, and M = 0.63 ± 0.04 M⊙. We compare its Teff in relation to the ZZ Ceti instability strip.