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Discovery of a magn...
Discovery of a magnetic field in the O9 sub-giant star HD 57682 by the MiMeS Collaboration
- Article/chapterEnglish2009
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Oxford University Press (OUP),2009
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LIBRIS-ID:oai:DiVA.org:uu-127415
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-127415URI
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https://doi.org/10.1111/j.1745-3933.2009.00771.xDOI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
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We report the detection of a strong, organized magnetic field in the O9IV star HD 57682, using spectropolarimetric observations obtained with ESPaDOnS at the 3.6-m Canada-France-Hawaii Telescope within the context of the Magnetism in Massive Stars (MiMeS) Large Programme. From the fitting of our spectra using non-local thermodynamic equilibrium model atmospheres, we determined that HD 57682 is a 17(-9)(+19)M(circle dot) star with a radius of 7.0(-1.8)(+2.4)R(circle dot) and a relatively low mass-loss rate of 1.4(-0.95)(+3.1) x 10(-9) M-circle dot yr(-1). The photospheric absorption lines are narrow, and we use the Fourier transform technique to infer v sin i = 15 +/- 3 km s(-1). This v sin i implies a maximum rotational period of 31.5 d, a value qualitatively consistent with the observed variability of the optical absorption and emission lines, as well as the Stokes V profiles and longitudinal field. Using a Bayesian analysis of the velocity-resolved Stokes V profiles to infer the magnetic field characteristics, we tentatively derive a dipole field strength of 1680(-356)(+134)G. The derived field strength and wind characteristics imply a wind that is strongly confined by the magnetic field.
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Wade, A
(author)
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Marcolino, F
(author)
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Petit, V
(author)
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Henrichs, F
(author)
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Cohen, H
(author)
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Alecian, E
(author)
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Bohlender, D
(author)
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Bouret, J.-C.
(author)
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Kochukhov, OUppsala universitet,Institutionen för fysik och astronomi
(author)
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Neiner, C
(author)
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St-Louis, N
(author)
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Townsend, D
(author)
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Uppsala universitetInstitutionen för fysik och astronomi
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)400:1, s. L94-L980035-87111365-29661745-39251745-3933
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Grunhut, H
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Wade, A
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Marcolino, F
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Petit, V
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Henrichs, F
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Cohen, H
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Alecian, E
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Bohlender, D
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Bouret, J.-C.
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Kochukhov, O
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Neiner, C
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St-Louis, N
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Townsend, D
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Uppsala University