A search for spectral variations of planetary nebulae and related objects
Abstract: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.
Document Type: Research Article
Affiliations: Fesenkov Astrophysical Institute, 480020, Almaty, Kazakhstan
Publication date: August 1, 2005