On the magnetic field and circumstellar environment of the young O7 star theta (1) Orionis C

Details On the magnetic field and circumstellar environment of the young O7 star theta (1) Orionis C On the magnetic field and circumstellar environment of the young O7 star theta (1) Orionis C

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...341..216d&link_type=abstract

Astronomy and Astrophysics, v.341, p.216-223 (1999)

Astronomy and Astrophysics

Astrophysics

11

Polarization, Stars: Circumstellar Matter, Stars: Early-Type, Stars: Individual: Theta (1) Ori C, Stars: Magnetic Fields

Scientific paper

We present new circular spectropolarimetric observations of the young O-type star theta (1) Orionis C obtained with the MuSiCoS échelle spectropolarimeter and the 2 m Télescope Bernard Lyot, in an attempt to detect the surface magnetic field structure invoked to explain the periodic variability of theta (1) Ori C at X-ray, UV and optical wavelengths. We obtain null detections with 250 G 1sigma error bars for the disc-averaged line-of-sight (i.e. longitudinal) component of the surface magnetic field vector, from which we conclude that the polar strength of the dipole field structure is lower than 1.6 to 2.0 kG (with a confidence level of 87%), depending on the exact orientation of the magnetic and rotation axes with respect to the line of sight. We report as well the unexpected discovery of strong, time variable continuum circular polarisation in the spectrum of theta (1) Ori C, as well as depolarisation structures associated with nebular emission lines, indicating that this continuum polarisation (the nature of which is as yet unclear) is produced within the immediate circumstellar environment. Based on data collected with the MuSiCoS spectropolarimeter of the Télescope Bernard Lyot, Observatoire du Pic du Midi, France

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