Atomic hydrogen in the planetary nebula IC 4997.
Abstract
In the course of a sensitive search for atomic hydrogen emission associated with planetary nebulae having high velocities relative to Galactic H I (Schneider et al., 1986), the authors detected absorption in the spectrum of IC 4997 (PK 58-10.1).
- Publication:
-
Circumstellar Matter
- Pub Date:
- 1987
- Bibcode:
- 1987IAUS..122..501G
- Keywords:
-
- H I Absorption:Planetary Nebulae;
- Planetary Nebulae:H I Absorption