A search for spectral variations of planetary nebulae and related objects
The results of long-term spectral observations were used to search for changes in planetary nebulae and emission-line stars. A significant increase in the degree of excitation is found for two objects: M1-6 and M1-11.
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Document Type: Research Article
Affiliations: Fesenkov Astrophysical Institute, 480020, Almaty, Kazakhstan
Publication date: 01 August 2005