SIMBAD references

2018MNRAS.478L..39S - Mon. Not. R. Astron. Soc., 478, L39-L43 (2018/July-3)

The pulsationally modulated radial crossover signature of the slowly rotating magnetic B-type star ξ1 CMa.


Abstract (from CDS):

We report the latest set of spectropolarimetric observations of the magnetic β Cep star ξ1 CMa. The new observations confirm the long-period model of Shultz et al. (2017), who proposed a rotational period of about 30 years and predicted that in 2018 the star should pass through a magnetic null. In perfect agreement with this projection, all longitudinal magnetic field <Bz> measurements are close to 0 G. Remarkably, individual Stokes V profiles all display a crossover signature, which is consistent with <Bz> ∼ 0 but is not expected when v sin i ∼ 0. The crossover signatures furthermore exhibit pulsationally modulated amplitude and sign variations. We show that these unexpected phenomena can all be explained by a 'radial crossover' effect related to the star's radial pulsations, together with an important deviation of the global field topology from a purely dipolar structure, that we explore via a dipole+quadrupole configuration as the simplest non-dipolar field.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: polarimetric - stars: early-type - stars: individual: x 1 CMa - stars: magnetic fields - stars: massive

Simbad objects: 2

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