Abstract
The results of new photometric (\(VRI\)) observations of the young star V719 Per from the IC 348 cluster are presented. Up until 2014, this star demonstrated brightness variability typical for UX Ori stars, i.e., caused by strong fluctuations in circumstellar extinction. In 2014, the star dimmed by approximately 3 magnitudes in the \(I\) band and remained in that state until 2017. There is reason to believe that the eclipse was caused by a disturbance in the innermost regions of the star’s protoplanetary disk. The dust raised above the disk caused the star’s radiation to be blocked for approximately three years. The role of various processes in the generation of such disturbances is discussed.
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Notes
It should be emphasized that the scattered radiation of the protoplanetary disk is not constant. On the contrary, \({{I}_{{{\text{sc}}}}}\) continuously fluctuates due to variations in the illumination conditions of the disk by the star, caused by fluctuations of circumstellar extinction in the inner regions of the disk. This explains the scatter of points in the brightness dependences of the polarization parameters of UX Ori stars [11]. In young stars observed from polar directions, such fluctuations cause the appearance of shadows in the images of the disks observed with interferometers in the near-IR part of the spectrum [14].
Otherwise, the IR radiation of dust in the magnetosphere would be comparable in strength to the radiation of the star itself.
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ACKNOWLEDGMENTS
The study used IR observations obtained with the WISE space telescope. The authors are grateful to L.V. Tambovtseva, N.A. Katysheva, and the anonymous reviewer for discussing the article and providing helpful comments.
Funding
The work of V.P.G. and O.Yu.B. was supported by the grant from the Ministry of Science and Higher Education of the Russian Federation no. 075-15-2020-780. The work of S.Yu.Sh. was supported by the Slovak Agency for Research and Development by the grant APVV-15-0458 and the grant from the Slovak Academy of Sciences VEGA 2/0030/21.
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Translated by M. Chubarova
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Grinin, V.P., Barsunova, O.Y., Sergeev, S.G. et al. Unusual Eclipse of the UX Ori Type Star V719 Per. Astron. Rep. 65, 864–868 (2021). https://doi.org/10.1134/S1063772921100139
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DOI: https://doi.org/10.1134/S1063772921100139