The double mode cepheid GZ Car has been investigated by means of photographic observations on plates of the southern sky patrols of Bamberg and Sonneberg Observatories and photoelectric measurements taken from literature. The author estimates the long time behaviour of the two pulsation modes. The first overtone shows instabilities as compared to the fundamental mode and incoherences of phase.
Veroeffentlichungen der Sternwarte Sonneberg
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