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Reaching the 1% accuracy level on stellar mass and radius determinations from asteroseismology

Published online by Cambridge University Press:  18 February 2014

V. Van Grootel ,
S. Charpinet ,
G. Fontaine ,
P. Brassard  and
E. M. Green
V. Van Grootel
Affiliation:
Institut d'Astrophysique et de Géophysique de l'Université de Liège, Allée du 6 Août 17, B-4000 Liège, Belgium email: valerie.vangrootel@ulg.ac.be
S. Charpinet
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France CNRS, IRAP, 14 avenue Edouard Belin, 31400 Toulouse, France
G. Fontaine
Affiliation:
Université de Montréal, Pavillon Roger-Gaudry, Département de Physique, CP 6128, Succ. Centre-Ville, Montréal QC, H3C 3J7, Canada
P. Brassard
Affiliation:
Université de Montréal, Pavillon Roger-Gaudry, Département de Physique, CP 6128, Succ. Centre-Ville, Montréal QC, H3C 3J7, Canada
E. M. Green
Affiliation:
Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ, 85721, USA
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Abstract

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Asteroseismic modeling of subdwarf B (sdB) stars provides measurements of their fundamental parameters with a very good precision; in particular, the masses and radii determined from asteroseismology are found to typically reach a precision of 1% containing various uncertainties associated with their inner structure and the underlying microphysics (composition and transition zones profiles, nuclear reaction rates, etc.). Therefore, the question of the accuracy of the stellar parameters derived by asteroseismology is legitimate. We present here the seismic modeling of the pulsating sdB star in the eclipsing binary PG 1336–018, for which the mass and the radius are independently and precisely known from the modeling of the reflection/irradiation effect and the eclipses observed in the light curve. This allows us to quantitatively evaluate the reliability of the seismic method and test the impact of uncertainties in our stellar models on the derived parameters. We conclude that the sdB star parameters inferred from asteroseismology are precise, accurate, and robust against model uncertainties.

Keywords

stars: binaries: eclipsingstars: subdwarfsstars: oscillations (including pulsations)stars: individual: PG 1336–018 (NY Virginis).
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S301: Precision Asteroseismology , August 2013 , pp. 305 - 308
Copyright
Copyright © International Astronomical Union 2014 

References

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