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A search for spectral variations of planetary nebulae and related objects

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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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Keywords: Planetary nebulae; Variability of spectra

Document Type: Research Article

Affiliations: Fesenkov Astrophysical Institute, 480020, Almaty, Kazakhstan

Publication date: 01 August 2005

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