Reference : Magnetometry of a sample of massive stars in Carina
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Magnetometry of a sample of massive stars in Carina
Nazé, Yaël mailto [Université de Liège - ULiège > > GAPHE : Astrophysique observationnelle (sol et espace) >]
Bagnulo, Stefano [Armagh Observatory, College Hill, Armagh BT61 9DG]
Petit, Véronique [Department of Geology & Astronomy, West Chester University, West Chester, PA 19383, USA]
Rivinius, Thomas [ESO - European Organisation for Astronomical Research in the Southern Hemisphere, Casilla 19001, Santiago 19, Chile]
Wade, Gregg [Department of Physics, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, ON K7K 4B4, Canada]
Rauw, Grégor mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
Gagné, Marc [Department of Geology & Astronomy, West Chester University, West Chester, PA 19383, USA)]
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
Yes (verified by ORBi)
United Kingdom
[en] stars: early-type ; stars: individual: Tr16-22 ; stars: individual: Tr16-13 ; stars: magnetic field ; open clusters and associations: individual: Car OB1
[en] 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. Based on data collected at ESO under Program ID 386.D-0624A.

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