He 2-25, Th 2-B, 19W32: further links between bipolar planetary nebulae and symbiotic stars?
Optical spectroscopy of the highly collimated bipolar nebulae He 2-25, Th 2-B and 19W32 is presented. He 2-25 and Th 2-B are found to have very dense (N_e~10^7 cm^-3) cores characterized by emission lines of low- to intermediate-ionization species, including rich [FeII] emission. The Hα profiles present broad non-Gaussian wings. These spectral
Corradi, Romano L. M.
Fecha de publicación:
9
1995