A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879
2019 ◽
Vol 484
(4)
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pp. 4495-4506
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Abstract Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a −600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of ∼2 kG was discovered a few years ago in the framework of the ESO large program ‘B-fields in OB stars’. Our FORS 2 spectropolarimetric observations from 2017 October 4 to 2018 February 21 reveal the presence of short- and long-term spectral variability and a gradual magnetic field decrease from about −300 G down to about −90 G. Different scenarios are discussed in an attempt to interpret our observations. Our FORS 2 radial velocity measurements indicate that HD 54879 is a member of a long-period binary.
1994 ◽
Vol 144
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pp. 29-33
2019 ◽
Vol 490
(4)
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pp. 5691-5691
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2020 ◽
Keyword(s):
2008 ◽
Vol 4
(S254)
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pp. 95-96
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1976 ◽
Vol 13
(6)
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pp. 790-802
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