A VLBI polarization study of SiO masers towards VY CMa
L.L. Richter, A.J. Kemball, J.L. Jonas
TL;DR
This study uses VLBI polarization imaging to analyze SiO masers around the supergiant star VY CMa, revealing details about its magnetic fields and atmospheric structure.
Contribution
It provides the first full polarization VLBI images of multiple SiO maser lines toward VY CMa, enhancing understanding of maser polarization and stellar atmosphere models.
Findings
Resolved SiO maser spots and their polarization properties.
Insights into magnetic field structure around VY CMa.
Implications for maser pumping mechanisms.
Abstract
Maser emission from the SiO molecule has been widely observed in the near-circumstellar envelopes of late-type, evolved stars. VLBI images can resolve individual SiO maser spots, providing information about the kinematics and magnetic field in the extended atmospheres of these stars. This poster presents full polarization images of several SiO maser lines towards the supergiant star VY CMa. VY CMa is a particularly strong SiO maser source and allows observations of a wide range of maser transitions. We discuss implications of these observations for VY CMa morphology, polarization, and pumping models.
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