High-Resolution 8--13 Micron Imaging of the Planetary Nebulae BD +30 degrees 3639 and NGC 6572
Abstract
High-resolution midinfrared images of the planetary nebulae BD + 30 deg 3639 and NGC 6572 are presented at 8.3, 8.7, 9.8, 11.2, and 12.4 microns. Analysis of the maps of BD + 30 deg 3639 supports a model in which the infrared emission originates from two spatially distinct components, one which is responsible for the continuum radiation at 8-12 microns and the other which produces the emission-line features. The NGC 6572 images provides evidence for a previously undetected 11.2 micron UIR emission feature. Comparison with radio continuum maps indicates that the distribution of dust is similar to the distribution of ionized gas in each nebula. Various models of source morphology are also investigated. The planetary nebulae DB + 30 deg 3639 and NGC 6572 can be modeled by an optically thin cylinder or a prolate ellipsoid with enhanced equatorial emission. These models reproduce well the general features of the nebula, such as the bipolar lobes of emission and the ring structure.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1990
- DOI:
- 10.1086/168643
- Bibcode:
- 1990ApJ...353..549H
- Keywords:
-
- Astronomical Maps;
- Emission Spectra;
- Infrared Imagery;
- Planetary Nebulae;
- Astronomical Models;
- Data Reduction;
- High Resolution;
- Astrophysics;
- INFRARED: SPECTRA;
- NEBULAE: INDIVIDUAL ALPHANUMERIC: BD;
- 30 DEGREES 3639;
- NEBULAE: INDIVIDUAL NGC NUMBER: NGC 6572;
- NEBULAE: PLANETARY