A large coronal loop in the Algol system

W. M. Peterson (), R. L. Mutel, M. Güdel and W. M. Goss
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W. M. Peterson: University of Iowa, Van Allen Hall, Iowa City, Iowa 52240, USA
R. L. Mutel: University of Iowa, Van Allen Hall, Iowa City, Iowa 52240, USA
M. Güdel: ETH Zurich, Institute of Astronomy
W. M. Goss: National Radio Astronomy Observatory, Pete V. Domenici Science Operations Center, 1003 Lopezville Road, Socorro, New Mexico 87801, USA

Nature, 2010, vol. 463, issue 7278, 207-209

Abstract: A stellar corona mapped Our knowledge of the morphology and time evolution of stellar coronae is based almost entirely on observations of the Sun. Now observations of the close binary system Algol (Beta Persei) in the constellation of Perseus have provided the first detailed time-lapse images of the magnetosphere of a star other than the Sun. Algol consists of a radio bright K subgiant star in a very close and rapid orbit with a main sequence B8 star. Theory predicts that the coronal plasma should be confined in a magnetic loop structure: the observations reveal a large coronal loop, about one subgiant diameter in height, which is rather larger than predicted, with its base straddling the subgiant and its apex oriented towards the B8 star.

Date: 2010
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DOI: 10.1038/nature08643

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