GD 154: White dwarf with multi- and monoperiodic pulsation
Konkoly Observatory, MTA CSFK, Konkoly-Thege M. u. 15-17, 1121 Budapest, Hungary
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We present the white dwarf GD 154 as an example where either monoperiodic or multiperiodic pulsation were found at different epochs. The mono-multi-monoperiodic stage seems to alternate. Many questions have been raised. Is this behaviour connected to the evolution of DAV stars? How often does it happen? Is there any regularity in this change of the pulsational behaviour or is it irregular?
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