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Astron. Astrophys. 341, 574-578 (1999)


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New observations of 53 Persei

J. De Ridder 1, K.D. Gordon 2, C.L. Mulliss 3 and C. Aerts * 1

1 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, B-3001 Heverlee, Belgium
2 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
3 Department of Physics and Astronomy, Ritter Observatory 405, University of Toledo, Toledo, OH 43606, USA

Received 22 September 1998 / Accepted 21 October 1998

Abstract

We gathered 37 new spectra of the B star 53 Persei spread over approximately 2 years. On these data, we performed a frequency and a mode analysis. We determined the physical parameters of 53 Persei and placed the star in the theoretical SPB instability strip. We also analysed the 110 photometric observations of the Hipparcos satellite. Our results show the presence of the two frequencies often quoted in the literature [FORMULA] c/d, [FORMULA] c/d and a third frequency [FORMULA] c/d which was first proposed by Mills & Dukes (1994). It is the first time that two studies result in the same third frequency based on two different data sets. The mode analysis provides evidence for [FORMULA] or [FORMULA] for the dominant mode, supporting the conclusions of Smith & Huang (1994).

Key words: stars: early-type – stars: fundamental parameters – stars: individual: 53 Persei – stars: oscillations

* Postdoctoral Fellow, Fund for Scientific Research, Flanders

© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998

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