Magnetometry of a sample of massive stars in Carina

[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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Nazé, Yaël ; 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 ; 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)

Language :

English

Title :

Magnetometry of a sample of massive stars in Carina

Publication date :

01 July 2012

Journal title :

Monthly Notices of the Royal Astronomical Society

ISSN :

0035-8711

eISSN :

1365-2966

Publisher :

Blackwell Publishing, Oxford, United Kingdom

Volume :

423

Pages :

3413-3419

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://cdsads.u-strasbg.fr/abs/2012MNRAS.423.3413N
http://de.arxiv.org/abs/1204.4267

Available on ORBi :

since 01 October 2012

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