Three Stages in Evolution of the Object Th4-4
Kondratyeva L. Denissyuk E. Shomshekova S. Reva I. Aimanova G. Krugov M.
February 2025Multidisciplinary Digital Publishing Institute (MDPI)
Galaxies
2025#13Issue 1
The results of observations of the object Th4-4 in 1970–2024 showed that during this period the object went through several stages, when its characteristics corresponded to different classes of objects: Be star, symbiotic star and planetary nebula. Currently, the object appears to be a low-excitation planetary nebula.
Be stars , emission spectra , light curve , planetary nebulae , profiles of emission line , symbiotic stars
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Fesenkov Astrophysical Institute, Observatory 23, Almaty, 050020, Kazakhstan
Fesenkov Astrophysical Institute
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