Very deep spectroscopy of NGC 7009
Abstract
We report new calculations of the effective recombination coefficients for the nebular N ii and O ii lines and very deep spectroscopy of the bright planetary nebula (PN) NGC 7009.
- Publication:
-
Highlights of Astronomy
- Pub Date:
- March 2015
- DOI:
- Bibcode:
- 2015HiA....16..622F
- Keywords:
-
- atomic data;
- line: formation;
- ISM: abundances;
- planetary nebulae: individual