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Astron. Astrophys. 337, 198-206 (1998)

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New multi-site observations of the [FORMULA] Scuti stars BS and BT Cancri

Results of the STEPHI VII campaign on the Praesepe cluster

M.M. Hernández 1, E. Michel 2, J.A. Belmonte 1, S.Y. Jiang 3, M. Álvarez 4, M. Chevreton 5, M. Paparó 6, H. Kjeldsen 7, D. Bauduin 2, J. Fromage 2, M.J. Goupil 2, Z.P. Li 3, Y.Y. Liu 3, A. Mangeney 8, G. Massacrier 9, O. Ringot 2, T. Roca Cortés 1, B. Servan 2 and I. Vidal 1

1 Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
2 Observatoire de Paris-Meudon, DASGAL, URA CNRS 335, F-92195 Meudon, France
3 Beijing Observatory, Chinese Academy of Sciences, Beijing, P.R. China
4 Instituto de Astronomía de la UNAM, Ap.P. 877, Ensenada, BC, Mexico
5 Observatoire de Paris-Meudon, DAEC, F-92195 Meudon, France
6 Konkoly Observatory, Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary
7 Institute of Physics and Astronomy, Aarhus University, Bygn. 520, DK-8000 Aarhus C, Denmark
8 Observatoire de Paris-Meudon, DESPA, F-92195 Meudon, France
9 Centre de Recherche Astronomique de Lyon, CNRS-UMR 5574, ENS Lyon, F-69364 Lyon, France

Received 22 April 1998 / Accepted 4 June 1998


New observations of BS and BT Cnc were performed during the STEPHI VII campaign in 1996 February. An overall run of 115 hours of data was collected. Different methods have been used to analyse the time series, bringing the detection of 2 frequencies for BT Cnc and 3 frequencies for BS Cnc above the 99% confidence level. A comparison with the literature reveals that the dominant mode of BT Cnc ([FORMULA] 9.8 c/d) has kept excited over tens of years, while the secondary modes have not been the same all the time. However, during the very last years the two frequencies detected by us have been the only ones noticeably excited in the spectrum.

Key words: stars: oscillations – Scu – open clusters and associations: individual : Praesepe – stars: individual: BS Cnc; BT Cnc

Send offprint requests to: M.M. Hernández, (mmanuel@iac.es)

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© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998