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Seismic analysis of the massive β Cephei star 15 Canis Majoris

Published online by Cambridge University Press:  23 January 2015

Przemysław Walczak
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences email: [email protected]
Gerald Handler
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences email: [email protected]
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Abstract

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15 Canis Majoris is a quite massive (M ~ 14 M) main sequence pulsator of the β Cephei type. Recent photometric (Handler 2014) and spectroscopic (Saesen & Briquet, priv. comm.) observations confirm four pulsational frequencies and indicate possible additional modes. We calculated models fitting two frequencies identified as radial and dipole modes. Our analysis indicates rather effective overshooting from the convective core as well as a strong dependence of the minimal required overshooting parameter (αov,min) on the metallicity, Zov,min ~ -2.5 Z).

When incorporating the non-adiabatic f-parameter (Daszynśka-Daszkiewicz & Walczak 2009), defined as the ratio of the bolometric flux changes to the radial displacement, significant differences between the opacity tables were obtained. The comparison of the models derived with different codes is also interesting. We used two evolutionary codes: Warsaw-New Jersey (Pamyatnykh et al.1998) and MESA (Paxton et al.2011) and some systematic differences were found.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

Daszyńska-Daszkiewicz, J., Dziembowski, W., & Pamyatnykh, A. 2003, A&A 407, 999Google Scholar
Daszyńska-Daszkiewicz, J., Dziembowski, W., & Pamyatnykh, A. 2005, A&A 441, 641Google Scholar
Daszyńska-Daszkiewicz, J. & Walczak, P. 2009, MNRAS 398, 1961Google Scholar
Handler, G. 2014, IAU Symposium 301, p. 417CrossRefGoogle Scholar
Iglesias, C. & Rogers, F. 1996, ApJ 464, 943CrossRefGoogle Scholar
Pamyatnykh, A., Dziembowski, W., Handler, G., & Pikall, H. 1998, A&A 333, 141Google Scholar
Paxton, B., Bildsten, L., Dotter, A., et al. 2011, ApJS 192, 3Google Scholar
Seaton, M. 2005, MNRAS p. 1CrossRefGoogle Scholar
Shobbrook, R., Handler, G., Lorenz, D., & Mogorosi, D. 2006, MNRAS 369, 171CrossRefGoogle Scholar