EDP Sciences
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Volume 415, Number 1, February III 2004
Page(s) 241 - 249
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20034142

A&A 415, 241-249 (2004)
DOI: 10.1051/0004-6361:20034142

Asteroseismology of the $\beta$ Cep star HD 129929

I. Observations, oscillation frequencies and stellar parameters
C. Aerts1, C. Waelkens1, J. Daszynska-Daszkiewicz1, 2, M.-A. Dupret3, 4, A. Thoul3, R. Scuflaire3, K. Uytterhoeven1, E. Niemczura2 and A. Noels3

1  Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
2  Astronomical Institute of the Wroclaw University, ul. Kopernika 11, 51-622 Wroclaw, Poland
3  Institut d'Astrophysique et de Géophysique, Université de Liège, allée du Six Août 17, 4000 Liège, Belgium
4  Instituto de Astrofísica de Andalucía-CSIC, Apartado 3004, 18080 Granada, Spain

(Received 1 August 2003 / Accepted 25 September 2003)

We have gathered and analysed a timeseries of 1493 high-quality multicolour Geneva photometric data of the B3V $\beta$ Cep star HD 129929. The dataset has a time base of 21.2 years. The occurrence of a beating phenomenon is evident from the data. We find evidence for the presence of at least six frequencies, among which we see components of two frequency multiplets with an average spacing of ~0.0121 c d -1 which points towards very slow rotation. This result is in agreement with new spectroscopic data of the star and also with previously taken UV spectra. We provide the amplitudes of the six frequencies in all seven photometric filters. The metal content of the star is $Z=0.018\pm 0.004$. All these observational results will be used to perform detailed seismic modelling of this massive star in a subsequent paper.

Key words: stars: oscillations -- stars: variables: general -- stars: individual: HD 129929

Offprint request: M.-A. Dupret, madupret@iaa.es

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