Hydrogen deficient planetary nebulae - Preliminary results
New spectra of A78 and A58 at different positions in the nebulae are presented. An abundance gradient is found in A78, extending quite close to the center. Similarly, the nebulous knot near the center of A58 has considerably higher heavy element abundances than the outer regions of this nebula. The ionization state is considerably lower in A58 than
Pottasch, S. R. et al.
Fecha de publicación:
0
1986