EDP Sciences
Free access
Volume 382, Number 2, February I 2002
Page(s) 556 - 562
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011668

A&A 382, 556-562 (2002)
DOI: 10.1051/0004-6361:20011668

Pulsational frequencies in the $\delta$ Scuti stars V624 Tauri and HD 23194

Results of the STEPHI X campaign on the Pleiades cluster
L. Fox-Machado1, M. Álvarez2, E. Michel3, Z. P. Li4, F. Pérez Hernández1, 5, M. Chevreton6, C. Barban3, J. A. Belmonte1, N. Dolez7, A. Fernandez6, J. P. Guo4, M. Haywood3, Y. Y. Liu4, S. Pau6, H. Planas2 and B. Servan3

1  Instituto de Astrofísica de Canarias, 38205 La Laguna Tenerife, Spain
2  Instituto de Astronomía de la UNAM, Ap.P. 877, Ensenada, BC, Mexico
3  Observatoire de Paris-Meudon, DASGAL, UMR 8633, 92195 Meudon, France
4  Beijing Observatory, Chinese Academy of Sciences, Beijing, PR China
5  Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
6  Observatoire de Paris-Meudon, DAEC, UMR 8632, 92195 Meudon, France
7  Observatoire Midi-Pyrénées, 31400 Toulouse, France

(Received 12 July 2001 / Accepted 13 November 2001 )

The results of the tenth multi-site campaign of the STEPHI network are reported. The $\delta$ Scuti stars V624 Tau (HD 23156) and HD 23194, belonging to the Pleiades cluster, were observed photometrically for 34 days on three continents during 1999 November-December. An overall run of 343 hours of data was collected. Seven frequencies for V624 Tau and two frequencies for HD 23194 have been found above a 99% confidence level. These results greatly improve those found in previous studies with much less data. A preliminary comparison of observed and theoretical frequencies suggests that both stars may oscillate with radial and non-radial p modes of radial orders typical among $\delta$ Scuti stars.

Key words: stars: oscillations -- stars: variables: $\delta$ Sct -- stars: individual: HD 23156, HD 23194

Offprint request: L. Fox-Machado, lfox@ll.iac.es

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