The magnetic field of Betelgeuse: a local dynamo from giant convection cells?

被引:75
作者
Auriere, M. [1 ]
Donati, J. -F. [1 ]
Konstantinova-Antova, R. [1 ,2 ]
Perrin, G. [3 ]
Petit, P. [1 ]
Roudier, T. [1 ]
机构
[1] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-65000 Tarbes, France
[2] Bulgarian Acad Sci, Inst Astron, BU-1784 Sofia, Bulgaria
[3] Observ Paris, LESIA, UMR8109, F-92190 Meudon, France
关键词
stars: individual: Betelgeuse; stars: magnetic field; stars: late-type; supergiants; RED SUPERGIANT STARS; ALPHA-ORIONIS; INTERFEROMETRIC OBSERVATIONS; DIFFERENTIAL ROTATION; EK ERIDANI; PHOTOSPHERE; SURFACE; SINGLE; SIMULATIONS; AP;
D O I
10.1051/0004-6361/201014925
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Betelgeuse is an M supergiant with a complex and extended atmosphere, which also harbors spots and giant granules at its surface. A possible magnetic field could contribute to the mass loss and to the heating of the outer atmosphere. Aims. We observed Betelgeuse, to directly study and infer the nature of its magnetic field. Methods. We used the new-generation spectropolarimeter NARVAL and the least square deconvolution (LSD) method to detect circular polarization within the photospheric absorption lines of Betelgeuse. Results. We have unambiguously detected a weak Stokes V signal in the spectral lines of Betelgeuse, and measured the related surface-averaged longitudinal magnetic field B(l) at 6 different epochs over one month. The detected longitudinal field is about one Gauss and is apparently increasing on the time scale of our observations. Conclusions. This work presents the first direct detection of the magnetic field of Betelgeuse. This magnetic field may be associated to the giant convection cells that could enable a "local dynamo".
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页数:4
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