Astron. Astrophys. 337, 790-796 (1998)

The discovery of new Doradus stars from the HIPPARCOS mission

C. Aerts ^{* 1}, L. Eyer ² and E. Kestens <sup>1, 3

1</sup> Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, B-3001 Leuven, Belgium
² Observatoire de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
³ Universitair Centrum voor Statistiek, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, B-3001 Leuven, Belgium

Received 21 January 1998 / Accepted 23 March 1998

Abstract

We present a classification of 39 new variable stars with spectral type between A2 and F8 discovered by Hipparcos with the aim to find new Doradus stars. We have used a multivariate classification scheme and report the discovery of 14 new Doradus variables among this unbiased sample. Our results point out the biased nature towards hot temperatures of earlier, ground-based surveys of these variables. The coolest star among our sample has an effective temperature only slightly hotter than 6 000 K.

For most of the 14 new Doradus stars, we are able to detect more than one period in the Hipparcos light curve. The multiperiodicity points towards the presence of high-order g-modes. In view of the lack of a pulsation mechanism for these objects, we determine their position in the HR diagram with respect to the Scuti stars.

Key words: stars: variables: other stars: oscillations stars: statistics methods: statistical

* Postdoctoral Fellow, Fund for Scientific Research, Flanders

Send offprint requests to: C. Aerts, (conny@ster.kuleuven.ac.be)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Selection of the candidates
• 3. Classification
• 4. Frequency analysis
• 5. Discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1998

Online publication: August 27, 1998
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