ξ1 CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star

Authors
  • M. Shultz
  • G. Wade
  • T. Rivinius
  • W. Marcolino
Publication date 23-01-2015
Journal Proceedings of the International Astronomical Union
Event New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry
Volume | Issue number 9 | S307
Pages (from-to) 399-400
Organisations
  • Faculty of Science (FNWI) - Anton Pannekoek Institute for Astronomy (API)
Abstract
We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic β Cep star ξ1 CMa (B1 III). This high-precision magnetometry is consistent with a rotational period Prot > 40 yr. Absorption line profiles can be reproduced with a non-rotating model. We constrain R⋆, L⋆, and the stellar age via a Baade-Wesselink analysis. Spindown due to angular momentum loss via the magnetosphere predicts an extremely long rotational period if the magnetic dipole Bd > 6 kG, a strength also inferred by the best-fit sinusoids to the longitudinal magnetic field measurements BZ when phased with a 60-year Prot.
Document type Article
Note With the MiMes Collaboration Proceedings title: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry: proceedings of the 307th Symposium of the International Astronomical Union held in Geneva, Switzerland June 23-27, 2014 Publisher: Cambridge University Press Place of publication: Cambridge ISBN: 9781107078581 Editors: G. Meynet, C. Georgy, J. Groh, P. Stee
Language English
Published at https://doi.org/10.1017/S1743921314007261
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