2-12.5 micron imaging of IRAS 21282+5050 - The structure of a young planetary nebula

Details 2-12.5 micron imaging of IRAS 21282+5050 - The structure of a young planetary nebula 2-12.5 micron imaging of IRAS 21282+5050 - The structure of a young planetary nebula

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..266m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 266-273.

Astronomy and Astrophysics

Astronomy

28

Carbon Monoxide, Image Resolution, Infrared Astronomy Satellite, Infrared Imagery, Planetary Nebulae, Spectral Bands, High Resolution, Near Infrared Radiation, Spatial Resolution, Stellar Envelopes

Scientific paper

We present 3.3, 8.5, 10.0, 11.3, and 12.5 micron narrow-band and K-band high spatial resolution images of IRAS-21282+5050 and a 6 cm flux density measurement. The new infrared images reveal a toroidal dust nebula, 4.5 x 6 arcsec, P.A. 165 deg, with two prominent emission peaks aligned almost E-W and separated by 1.7-2.1 arcsec; a remarkably similar structure to that observed in NGC 7027. From the 6 cm flux density and the dust nebula size, we derive an electron density of 3.6 x 10 exp 3/cu cm for the central ionized region. Comparison of these images with a published CO 1-0 map suggests that the structure of this dusty, ionization-bounded planetary nebula may reflect the density inhomogeneities of the progenitor's wind. Only slight spatial differences are discernible between the K-band and 10 micron 'dust' continuum images and the 3.3, 11.3, and 12.5 micron unidentified infrared emission-band images which have been attributed to polycyclic aromatic hydrocarbons (PAHs). This tight spatial correlation suggests that the K-band and 10 micron emission also arises from PAHs.

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