EDP Sciences
Free access
Volume 385, Number 2, April II 2002
Page(s) 533 - 536
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020146

A&A 385, 533-536 (2002)
DOI: 10.1051/0004-6361:20020146

Research Note

Detecting low amplitude periodicities with HIPPARCOS

T. Kallinger and W. W. Weiss

Institute for Astronomy (IfA), University of Vienna, Tuerkenschanzstrasse 17, 1180 Vienna, Austria

(Received 19 July 2001 / Accepted 22 January 2002 )

The HIPPARCOS and TYCHO catalogues have proven to be a very powerful source for detection of variability in stars. The photometric errors for individual measurements are typically of the order of a few millimagnitudes. Amplitudes for periodic variability of stars and based on HIPPARCOS data are published which are of the same order. An example could be the still controversial case of ET And (Scholz et al. 1998; Weiss et al. 1998) with contradicting evidence for HIPPARCOS and ground-based observations. Another case could be the AGB star RV Cam (Kerschbaum et al. 2001) with a similar contradiction. In this paper we investigate the properties of HIPPARCOS photometry for a set of 4863 presumably constant stars and we determine the frequency ranges of HIPPARCOS which seem to be affected by the instrument.

Key words: stars: variable: general -- techniques: photometric

Offprint request: T. Kallinger, kallinger@astro.univie.ac.at

SIMBAD Objects in preparation

© ESO 2002