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Detecting low amplitude periodicities with HIPPARCOS
The HIPPARCOS and TYCHO catalogues have proven to be a very powerfulsource for detection of variability in stars. The photometric errors forindividual measurements are typically of the order of a fewmillimagnitudes. Amplitudes for periodic variability of stars and basedon HIPPARCOS data are published which are of the same order. An examplecould be the still controversial case of ET And (Scholz et al.\cite{Sch98}; Weiss et al. \cite{Wei98}) with contradicting evidence forHIPPARCOS and ground-based observations. Another case could be the AGBstar RV Cam (Kerschbaum et al. \cite{Ker01}) with a similarcontradiction. In this paper we investigate the properties of HIPPARCOSphotometry for a set of 4863 presumably constant stars and we determinethe frequency ranges of HIPPARCOS which seem to be affected by theinstrument. Based on HI photometry and SIMBAD database interrogations.
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