Journal Article

Magnetometry of a sample of massive stars in Carina*

Yaël Nazé, Stefano Bagnulo, Véronique Petit, Thomas Rivinius, Gregg Wade, Gregor Rauw and Marc Gagné

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 4, pages 3413-3419
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21134.x
Magnetometry of a sample of massive stars in Carina*

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X-ray surveys of the Carina nebula have revealed a few hard and luminous sources associated with early-type stars. Such unusual characteristics for the high-energy emission may be related to magnetically confined winds. To search for the presence of magnetic fields in these objects, we performed a limited spectropolarimetric survey using the Focal reducer and low dispersion spectrograph (FORS) instrument. The multi-object mode was used, so that a total of 21 OB stars could be investigated during a one-night-long run. A magnetic field was detected in two objects of the sample, with a 6σ significance: Tr16-22 and 13. Such a detection was expected for Tr16-22, as its X-ray emission is too bright, variable and hard, compared to other late-type O or O+OB systems. It is more surprising for Tr16-13, a poorly known star which so far has never shown any peculiar characteristics. Subsequent monitoring is now needed to ascertain the physical properties of these objects and enable a full modelling of their magnetic atmospheres and winds.

Keywords: stars: early-type; stars: individual: Tr16-22; stars: individual: Tr16-13; stars: magnetic field; open clusters and associations: individual: Car OB1

Journal Article.  5241 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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