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Article
An evolutionary model for the wolf rayet nebula NGC 2539
The main outer ring of the WR nebula NGC 2539 expands radially with velocity ≈ 26kms−1. The dynamics are modelled as the interaction of the winds from the O progenitor and the present WR stage with clumpy molecul...
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Article
NGC 4151 entering in an active phase
Photometric observations of the nucleus of NGC 4151 obtained in a period of 16 nights in April 1990 in the 5672 Å continuum and theU-band have clearly shown that the nucleus has entered into an active phase and i...