Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-10
Astron.&Astrophys. Transactions 4 (2005) 291-296
Astronomy and Astrophysics
Astrophysics
Scientific paper
The results of long-term spectral observations were used to search for
changes in planetary nebulae and emission-line stars. Significant increase of
excitation degree is found in two objects: M1-6 and M1-11.
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