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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
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Grunhut, H (author)
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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, O (author)
- Uppsala universitet,Institutionen för fysik och astronomi
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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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(creator_code:org_t)
- Oxford University Press (OUP), 2009
- 2009
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 400:1, s. L94-L98
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- stars: early-type
- stars: individual: HD 57682
- stars: magnetic fields
- stars: rotation
- stars: winds
- outflows
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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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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show more...
-
Alecian, E
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Bohlender, D
-
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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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Uppsala University