BPM 30551, which is a DA-type white dwarf located in the region of the UBV (2)-color plane favorable to variability, has been found to be a rather complex ZZ Ceti star with periods of 606.8, 682.7, 744.7, and 840.2 s and amplitudes 0.01 mag. Subject headings: stars: individual - stars: variable - stars: white dwarfs
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Hesser et al. (1976) studied this question.