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2 results

  • Is the wind of the Oe star HD 155806 magnetically confined?

  • Alex W. Fullerton, Véronique Petit, Stefano Bagnulo, Gregg A. Wade, the MiMeS Collaboration
  • Journal:
    Proceedings of the International Astronomical Union / Volume 6 / Issue S272 / July 2010
    Published online by Cambridge University Press:
    12 July 2011, pp. 182-183
    Print publication:
    July 2010
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  • Spectropolarimetric observations of HD 155806 – the hottest Galactic Oe star – were obtained with CFHT/ESPaDOnS to test the hypothesis that disk signatures in its spectrum are due to magnetic channeling and confinement of its stellar wind. We did not detect a dipole field of sufficient strength to confine the wind, and could not confirm previous reports of a magnetic detection. It appears that stellar magnetism is not responsible for producing the disk of HD 155806.

  • The surprising X-ray emission of Oe stars

  • Yael Nazé, Gregor Rauw, Asif ud-Doula
  • Journal:
    Proceedings of the International Astronomical Union / Volume 6 / Issue S272 / July 2010
    Published online by Cambridge University Press:
    12 July 2011, pp. 624-625
    Print publication:
    July 2010
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  • Oe stars are thought to represent an extension of the Be phenomenon to higher temperatures. Dedicated XMM observations of HD 155806 revealed a surprising X-ray spectrum: soft character, absence of overluminosity, broad X-ray lines. These properties are fully compatible with the wind-shock model, which usually explains the X-rays from “normal”, single O-type stars. In contrast, some other Oe/Be stars display a completely different behaviour at high energies.