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


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The discovery of new [FORMULA] Doradus stars from the HIPPARCOS mission

C. Aerts * 1, L. Eyer 2 and E. Kestens 1, 3

1 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 [FORMULA]Doradus stars. We have used a multivariate classification scheme and report the discovery of 14 new [FORMULA]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 [FORMULA]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 [FORMULA]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)

© European Southern Observatory (ESO) 1998

Online publication: August 27, 1998

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