aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 30 10.31059/aat.vol2.iss1.pp21-25 Research articles A study of many-year spectral variability of the Ae Herbig star HD 36112 Fursyak Mariya Kozlova Olesya Crimean Astrophysical Observatory, Nauchny, 298409 Crimean Astrophysical Observatory, Nauchny, 298409 19 11 2021 2 1 21 25 19 11 2021 Copyright (c) 2026 Fursyak M., Kozlova O. 2026 M.I. Fursyak, O.V. Kozlova The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

We present the results of long-term high-dispersion spectral observations (R = 20000) of the Ae Herbig star HD 36112 in the regions of the H a emission line and the NaI D resonance doublet lines. They show that parameters of the H a emission line demonstrate complicated variability on several time scales: 1) variability from night to night caused by inhomogeneity of the circumstellar envelope; 2) variability on a time scale of about 1200 d characterized by a variation of the equivalent width, intensity, and other emission parameters; 3) variability on a time scale of more than 4000 d observed as a many-year trend in variations of parameters of the H a emission line. We associate these results with variability of physical and kinematic conditions in the inner regions of the accretion disk and wind. The most probable mechanism of this variability is a process of planet formation in the circumstellar disk.

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