SIMBAD references

2019MNRAS.484.4495H - Mon. Not. R. Astron. Soc., 484, 4495-4506 (2019/April-3)

A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879.

HUBRIG S., KUKER M., JARVINEN S.P., KHOLTYGIN A.F., SCHOLLER M., RYSPAEVA E.B. and SOKOLOFF D.D.

Abstract (from CDS):

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. Surprisingly, we discover on the night of 2018 February 17 a sudden, short-term increase of the magnetic field strength and measure a longitudinal magnetic field of -833 G. The inspection of the FORS 2 spectrum acquired during the observed magnetic field increase indicates a very strong change in spectral appearance with a significantly lower photospheric temperature and a decrease of the radial velocity by several 10 km s–1. 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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): MHD - stars: atmospheres - stars: early-type - stars: individual: HD 54879 - stars: magnetic field - stars: variables: general

Errata: erratum vol. 490, p. 5691 (2019)

Simbad objects: 7

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2020.11.23-18:34:55

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