The circular and linear polarization parameters of the SiO masers in VY CMa have been measured in the v = 1, J = 2-1 (86 GHz) and v = I, J = 1-0 (43 GHz) transitions. The higher frequency is less circularly polarized than the lower frequency transition.
- Circumstellar matter
- Stars: individual (VY Canis Majoris)
- Techniques: polarimetric