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The pulsationally modulated radial crossover signature of the slowly rotating magnetic B-type star xi(1) CMa
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
2018 (English)In: Monthly Notices of the Royal Astronomical Society: Letters, ISSN 1745-3925, Vol. 478, no 1, p. L39-L43Article in journal (Refereed) Published
Abstract [en]

We report the latest set of spectropolarimetric observations of the magnetic beta Cep star xi 1 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 < B-z > measurements are close to 0 G. Remarkably, individual Stokes V profiles all display a crossover signature, which is consistent with < B-z > similar to 0 but is not expected when v sin i similar to 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.

Place, publisher, year, edition, pages
Oxford University Press (OUP) , 2018. Vol. 478, no 1, p. L39-L43
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-368684DOI: 10.1093/mnrasl/sly070ISI: 000450777200008OAI: oai:DiVA.org:uu-368684DiVA, id: diva2:1268666
Funder
Knut and Alice Wallenberg FoundationSwedish Research CouncilSwedish National Space BoardAvailable from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-01-16Bibliographically approved

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Shultz, MatthewKochukhov, Oleg

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