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Candidate Ap stars in close binary systems

Published online by Cambridge University Press:  07 August 2014

C. P. Folsom ,
G. A. Wade ,
K. Likuski ,
O. Kochukhov ,
E. Alecian ,
D. Shulyak  and
N. M. Johnson
C. P. Folsom
Affiliation:
Institut de Recherche en Astrophysique et Planétologie, Toulouse, France email: colin.folsom@irap.omp.eu Armagh Observatory, Armagh, Northern Ireland
G. A. Wade
Affiliation:
Department of Phyics, Royal Military College of Canada, Kingston, Canada
K. Likuski
Affiliation:
Department of Phyics, Royal Military College of Canada, Kingston, Canada
O. Kochukhov
Affiliation:
Department of Astronomy and Space Physics, Uppsala University, Uppsala, Sweeden
E. Alecian
Affiliation:
Observatoire de Paris, Meudon, France
D. Shulyak
Affiliation:
Institute of Astrophysics, Georg-August-University, Göttingen, Germany
N. M. Johnson
Affiliation:
Department of Phyics, Royal Military College of Canada, Kingston, Canada
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Abstract

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Short period binary systems containing magnetic Ap stars are anomalously rare. This apparent anomaly may provide insight into the origin of the magnetic fields in theses stars. As an early investigation of this, we observed three close binary systems that have been proposed to host Ap stars. Two of these systems (HD 22128 and HD 56495) we find contain Am stars, but not Ap stars. However, for one system (HD 98088) we find the primary is indeed an Ap star, while the secondary is an Am star. Additionally, the Ap star is tidally locked to the secondary, and the predominately dipolar magnetic field of the Ap star is roughly aligned with the secondary. Further investigations of HD 98088 are planned by the BinaMIcS collaboration.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 313 - 314
Copyright
Copyright © International Astronomical Union 2014 

References

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