Title: Discovery of magnetic fields in three He variable Bp stars with He and Si spots
Authors: Briquet, Maryline ×
Hubrig, S
Scholler, M
De Cat, P #
Issue Date: 2007
Publisher: Wiley-v c h verlag gmbh
Series Title: Astronomische nachrichten vol:328 issue:1 pages:41-45
Abstract: It is essential for the understanding of stellar structure models of high mass stars to explain why constant stars, nonpulsating chemically peculiar hot Bp stars and pulsating stars co-exist in the slowly pulsating B stars and beta 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 I 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 mesurement at 3 sigma 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. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN: 0004-6337
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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