Three Stages in Evolution of the Object Th4-4

Galaxies, 2025

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DOI 10.3390/galaxies13010005
Data confidence 70 medium
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Abstract

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.