[xi]1 CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star

[xi]1 CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star

Abstract We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic [beta] Cep star ξ1 CMa (B1 III). This high-precision magnetometry is consistent with a rotational period P rot > 40 yr. Absorption line profiles can be reproduced with a non-rotating model. We constrain R *...

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Veröffentlicht in:Proceedings of the International Astronomical Union 2014-06, Vol.9 (S307), p.399
Hauptverfasser: Shultz, Matt, Wade, Gregg, Rivinius, Thomas, Marcolino, Wagner, Henrichs, Huib, Grunhut, Jason, Meynet, Georges, Georgy, Cyril, Groh, José, Stee, Philippe
Format: Artikel
Sprache:eng
Schlagworte:
Astrophysics
Magnetic fields
Stars & galaxies
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Zusammenfassung:Abstract We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic [beta] Cep star ξ1 CMa (B1 III). This high-precision magnetometry is consistent with a rotational period P rot > 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 B d > 6 kG, a strength also inferred by the best-fit sinusoids to the longitudinal magnetic field measurements B Z when phased with a 60-year P rot.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921314007261