Autore: Henny J.G.L.M. Lamers

A strange field of speculation is opened by this phenomenon … here we have a star fitfully variable to an astonishing extent. and whose fluctuations are spread over centuries. apparently in no sett …

On April 28 1986 Cornelis de Jager reached the age of 65 years. On April 30 he officially retired from the University of Utrecht where he has held a Chair for Stellar Astrophysics, later changed into …

Planetary nebulae present a fascinating range of shapes and morphologies. They are ideal laboratories for the study of different astrophysical processes: atomic physics, radiative transfer, stellar w …