Determination of the Term Symbiotic Star
Symbiotic stars have been studied for many years. But the common determination of the term “symbiotic star” does not exist even now. Merrill (1958) introduced this term in order to emphasize unusual spectral features — absorption TiO bands and emission lines belonging to highly ionized ions.
KeywordsEmission Line Planetary Nebula Crimean Astrophysical Observatory Type Star Cool Star
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