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Multimode Detections from Surveys

Published online by Cambridge University Press:  12 April 2016

C. Aerts
C. Aerts*
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Belgium

Abstract

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In this study we present an overview of the search for multiple frequencies in variable Be stars from surveys. We review the recent ground-based photometric surveys and conclude from them that multiperiodicity is not detected. The photometric experiment on board Hipparcos, on the other hand, does allow us to derive multiple periods for a few Be stars. We present the results of our frequency searches in the Hipparcos data for 50 λ Eri stars.

Further we review the recent spectroscopic campaigns dedicated to some stars. It seems that all of these campaigns point to multiperiodic phenomena, although for most of them the time base is insufficient to derive the periods with high accuracy. Moreover, the spectroscopic periods are often not the same as those found from the photometry. This clearly demonstrates the necessity of long-term simultaneous photometric and spectroscopic campaigns. We present the preliminary results of such a campaign for the λ Eri star HD 105382.

We close with reflections on the cause of the variability observed in the λ Eri stars and on the best viewpoint for further research in this area.

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 192 - 204
Copyright
Copyright © Astronomical Society of the Pacific 2000

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