Magnetic fields in cometary globules. I. CG 22.

Details Magnetic fields in cometary globules. I. CG 22. Magnetic fields in cometary globules. I. CG 22.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279.1191s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 279, No. 4, p. 1191 - 1196

Astronomy and Astrophysics

Astronomy

6

Polarization -- Stars :Individual: Wra 220 -- Ism: Globules -- Ism: Individual: Cg 22 -- Ism: Magnetic Fields -- Ism: Structure, Globules: Cometary Nebulae, Globules: Magnetic Fields, Globules: Polarization

Scientific paper

The authors report first results from a programme to study magnetic fields in cometary globules (CGs). These are clouds near massive stars showing a head-tail morphology. Linear optical polarization measurements on stars seen projected on CG 22 in the Gum-Vela region are presented. A majority of the stars seen within the boundary of the cloud show a polarization of ≡1 per cent with the electric field vector oriented parallel to the tail, whereas those outside the boundary either show small polarization with position angles parallel to the Galactic plane or show no polarization within the errors of the authors' measurements. If the polarization is due to dust grains aligned by magnetic fields, the authors' results imply that the field in CG 22 is parallel to its tail. A rough estimate of the field strength (≡30 μG) indicates that it may be important for the dynamics of the cloud. These results support the idea that magnetic fields play a role in producing the structures seen in the tails of the CGs. The authors suggest that the alignment of the magnetic field could only have been caused by the same process that shaped the tails. They also comment on the implications of the polarization detected in the light from the star Wra 220, a T Tauri star believed to have formed in the head of CG 22.

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