Abstract
The influence of large-scale perturbations in a circumstellar disk on the linear polarization of UX Ori stars is considered. We show that the position angle of the intrinsic linear polarization of a star surrounded by a geometrically thin flared disk cannot change significantly after the passage through the photometric minimum due to perturbations in the disk. In contrast, perturbations in a disk puffed up in the dust sublimation zone can give deflections of the plane of linear polarization of the system’s radiation up to 60°. This model allows the unusual changes in linear polarization observed in UX Ori and WW Vul after prolonged photometric minima to be explained.
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Acknowledgments
We are grateful to A.N. Rostopchina-Shakhovskaya who provided the observations of UX Ori and WW Vul from the Crimean Astrophysical Observatory archive.
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Russian Text © The Author(s), 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 10, pp. 716–730.
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Shulman, S.G., Grinin, V.P. Influence of Large-Scale Perturbations in Circumstellar Disks on the Linear Polarization Parameters of UX Ori Stars. Astron. Lett. 45, 664–676 (2019). https://doi.org/10.1134/S1063773719100062
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DOI: https://doi.org/10.1134/S1063773719100062