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- Title
Maser polarization simulation in an evolving star: effect of magnetic field on SiO maser in the circumstellar envelope.
- Authors
Phetra, M.; Gray, M. D.; Asanok, K.; Kramer, B. H.; Sugiyama, K.; Etoka, S.; Nuntiyakul, W.
- Abstract
Maser polarization changes during a pulsation in the CSE of an AGB star are related in a complicated way to the magnetic field structure. 43 GHz SiO maser transitions are useful for polarization study because of their relatively simple Zeeman splitting structure and their location. This work uses 3D maser simulation to investigate the effect of the magnetic field on maser polarization with different directions. The results show that linear polarization depends on the magnetic direction while circular polarization is less significant. The EVPA changes through π/2 at an angle of around 50 degrees, approximately the Van Vleck angle. The EVPA rotation result from 3D maser simulation is consistent with results from 1D simulations, and may explain the 90 degree change of the EVPA within a single cloud in the observational cases of TX Cam and R Cas.
- Subjects
MAGNETIC field effects; STELLAR magnetic fields; MASERS; ASYMPTOTIC giant branch stars; MAGNETIC structure; LINEAR polarization
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 18, Issue S380, p435
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921323003551