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Catalogue POP – Notice individuelle de publication

Donati Jean-François, Howarth I. D., Jardine M. M., Petit Pascal, Catala Claude, Landstreet John D., Bouret J.-C., Alecian Evelyne, Barnes J. R., Forveille Thierry, Paletou Frédéric, Manset Nadine

The surprising magnetic topology of tau Sco: fossil remnant or dynamo output?

Monthly notices of the Royal Astronomical Society, 2006, vol. 370, pp. 629-644

Référence ADS : 2006MNRAS.370..629D

Résumé :

We report the discovery of a medium-strength (~0.5 kG) magnetic field on the young, massive star tau Sco (B0.2V), which becomes the third-hottest magnetic star known. Circularly polarized Zeeman signatures are clearly detected in observations collected mostly with the ESPaDOnS spectropolarimeter, recently installed on the 3.6-m Canada-France-Hawaii Telescope; temporal variability is also clearly established in the polarimetry, and can be unambiguously attributed to rotational modulation with a period close to 41 d. Archival ultraviolet (UV) spectra confirm that this modulation repeats over time-scales of decades, and refine the rotation period to 41.033 +/- 0.002 d.

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