Article (Scientific journals)
Discovery of magnetic fields in three He variable Bp stars with He and Si spots
Briquet, Maryline; Hubrig, S.; Schöller, M. et al.
2007In Astronomische Nachrichten, 328, p. 41-45
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Keywords :
stars: chemically peculiar; stars: individual (HD 55522; HD 105382; HD 131120; HD 138769); stars: magnetic fields
Abstract :
[en] It is essential for the understanding of stellar structure models of high mass stars to explain why constant stars, non-pulsating chemically peculiar hot Bp stars and pulsating stars co-exist in the slowly pulsating B stars and β Cephei instability strips. We have conducted a search for magnetic fields in the four Bp stars HD 55522, HD 105382, HD 131120, and HD 138769 which previously have been wrongly identified as slowly pulsating B stars. A recent study of these stars using the Doppler Imaging technique revealed that the elements He and Si are inhomogeneously distributed on the stellar surface, causing the periodic variability. Using FORS 1 in spectropolarimetric mode at the VLT, we have acquired circular polarisation spectra to test the presence of a magnetic field in these stars. A variable magnetic field is clearly detected in HD 55522 and HD 105382, but no evidence for the existence of a magnetic field was found in HD 131120. The presence of a magnetic field in HD 138769 is suggested by one measurement at 3 σ level. We discuss the occurrence of magnetic B stars among the confirmed pulsating B stars and find strong magnetic fields of order kG and oscillations to be mutually exclusive. Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO programmes 71.D-0308(A), 072.D-0377(A), and 073.D-0466(A)).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Briquet, Maryline ;  KULeuven > Instituut voor Sterrenkunde
Hubrig, S.;  European Southern Observatory, Casilla 19001, Santiago 19, Chile
Schöller, M.;  European Southern Observatory, Casilla 19001, Santiago 19, Chile
De Cat, P.;  Koninklijke Sterrenwacht van Belgium, Ringlaan 3, B-1180 Brussel, Belgium
Language :
English
Title :
Discovery of magnetic fields in three He variable Bp stars with He and Si spots
Publication date :
01 January 2007
Journal title :
Astronomische Nachrichten
ISSN :
0004-6337
eISSN :
1521-3994
Publisher :
Wiley, Berlin, Germany
Volume :
328
Pages :
41-45
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/astro-ph/0610537
Available on ORBi :
since 20 June 2012

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