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Originally published in Science Express on 29 May 2003
Science 20 June 2003:
Vol. 300. no. 5627, pp. 1926 - 1928
DOI: 10.1126/science.1084993
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Reports

Asteroseismology of HD 129929: Core Overshooting and Nonrigid Rotation

C. Aerts,1* A. Thoul,2 J. Daszynska,1,3 R. Scuflaire,2 C. Waelkens,1 M. A. Dupret,2 E. Niemczura,3 A. Noels2

We have gathered and analyzed 1493 high-quality multicolor Geneva photometric data taken over 21 years of the B3Vstar HD 129929. We detect six frequencies, among which appear the effects of rotational splitting with a spacing of ~0.0121 cycles per day, which implies that the star rotates very slowly. A nonadiabatic analysis of the oscillations allows us to constrain the metallicity of the star to Z {epsilon} [0.017,0.022], which agrees with a similar range derived from spectroscopic data. We provide evidence for the occurrence of core convective overshooting in the star, with {alpha}ov = 0.10 ± 0.05, and we rule out rigid rotation.

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

* To whom correspondence should be addressed. E-mail: conny{at}ster.kuleuven.ac.be

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