A study of the luminous blue variable Hen 3-519 and its neighbor AG Car

Previous literature has described the circumstellar environment of the luminous blue variable star AG Car, but less is known about its neighbor, Hen 3-519. We examine optical linear polarimetry, obtained with the Halfwave spectropolarimeter (HPOL), to study the aspherical circumstellar environment of these evolved massive stars. The mean-subtracted Q-U diagram displays a distinctive loop pattern, indicative of a unique circumstellar geometry. The Q-U diagram of AG Car also exhibits a notable pattern, albeit without a fully defined loop as observed in Hen 3-519. By comparing the polarization data from Hen 3-519 and AG Car, this study aims to enhance our understanding of the mass loss processes and stellar wind structures in massive stars. We also explore potential explanations for the Q-U loop phenomenon observed in Hen 3519, contributing to the broader knowledge of LBV evolution and stellar wind dynamics.