Constraints on parameters of B-type pulsators from combined multicolour photometry and radial velocity data. I. $\beta$ Cephei stars

Abstract

We analyze data on pulsation amplitudes and phases for two $\beta$ Cephei stars, $\delta$ Cet and $\nu$ Eri. Strömgren photometry and radial velocity measurements are used simultaneously to obtain constraints on mean parameters of the stars and identification of the excited modes. The inference about the radial mode order and mean star parameters is based on comparison of certain complex parameter, $f$, determined from data, with its counterpart derived from linear nonadiabatic modelling of stellar oscillations. The theoretical $f$ values are very sensitive to the adopted opacity data. In our modelling we rely on the data from OPAL and OP projects. Significant differences were found. New seismic models of $\nu$ Eri were constructed with both the OPAL and OP opacities.

11 pages, 13 figures, A&A in press

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• Complex asteroseismology of the $\beta$ Cep/SPB pulsator $\nu$ Eridani: constraints on opacities
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• Seismic modelling of early B-type pulsators observed by BRITE: I. $\theta$ Ophiuchi
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• Asteroseismology of Pulsating Stars
• Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348
• Mode identification and seismic study of $\delta$ Scuti, the prototype of a class of pulsating stars
• Effect of NLTE model atmospheres on photometric amplitudes and phases of early B-type pulsating stars
• Inference for Stellar Opacities from Seismic Studies of the Hybrid $\beta$ Cep/SPB pulsators
• Complex asteroseismology of the hybrid B-type pulsator $\gamma$ Pegasi: a test of stellar opacities
• Constraints on stellar parameters of the SPB star HD182255 from complex asteroseismology
• Complex asteroseismology of the Slowly Pulsating B-type star HD74560
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