Abstract
38 Eri is a δ Scuti star in the shell hydrogen burning stage of evolution, with a 0.04 mag peak-to-peak amplitude and a very complex light variation. It was discovered in 1971. In the subsequent investigation the star always showed a different frequency content. A ground-based multi-site campaign and a MOST observation were devoted to resolve the contradicting pulsational behaviour. We present the preliminary result of our investigation obtained on Stromgren b and MOST data. The complexity of the pulsation is confirmed, but the comprehensive analysis helps to resolve the frequencies of the fast rotating star.
Highlights
All the previous ground-based observations, both photometric and spectroscopic, revealed a very complex frequency content of 38 Eri
We present the preliminary result of our investigation obtained on Strömgren b and MOST data
It was questionable that the excited amplitudes of the frequencies were changing or the frequency content was not properly resolved
Summary
All the previous ground-based observations, both photometric and spectroscopic, revealed a very complex frequency content of 38 Eri. None of them confirmed the previous set of frequencies, some frequencies were missing or new ones appeared. A ground-based multi-site campaign and the MOST space data were devoted to answer the question. The preliminary analyses revealed how serious a task it is to find the frequencies using single site data. We can recognize a doublet (left panel) or triplet (right panel) at around 10.47 d−1, but the peaks around 5.2 d−1 appear only in the dataset with better sampling. A peak at 12.62 d−1 appears only in the subset with better sampling. The preliminary investigation confirms that the single site observation is not enough for resolving the complexity of the pulsation in 38 Eri
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