Mon. Not. R. Astron. Soc., 423, 3413-3419 (2012/July-2)
Magnetometry of a sample of massive stars in Carina.
NAZE Y., BAGNULO S., PETIT V., RIVINIUS T., WADE G., RAUW G. and GAGNE M.
Abstract (from CDS):
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.
2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
stars: early-type - stars: individual: Tr16-22 - stars: individual: Tr16-13 - stars: magnetic field - open clusters and associations: individual: Car OB1
Status at CDS:
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