ξ 1 CMa: An Extremely Slowly Rotating Magnetic B0.7 IV Star
We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic β Cep star ξ 1 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...
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Veröffentlicht in: | Proceedings of the International Astronomical Union 2014-06, Vol.9 (S307), p.399-400 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | We present our analysis of 6 years of ESPaDOnS spectropolarimetry of the magnetic β Cep star ξ
1
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
. |
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ISSN: | 1743-9213 1743-9221 |
DOI: | 10.1017/S1743921314007261 |