Dust and extinction in the planetary nebula NGC 7027

Details Dust and extinction in the planetary nebula NGC 7027 Dust and extinction in the planetary nebula NGC 7027

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..567w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 567-576. Research supported by National Geographic So

Astronomy and Astrophysics

Astrophysics

20

Cosmic Dust, Infrared Imagery, Interstellar Extinction, Planetary Nebulae, H Ii Regions, Ionized Gases, Near Infrared Radiation, Spatial Resolution

Scientific paper

High spatial resolution (not more than 1.0 arcsec/pixel) optical and near-IR images of NGC 7027 obtained to investigate the overall dust distribution and small-scale (about 1-2 arcsec) extinction variation is presented. Analysis of the derived near-IR color excess suggests that the variation of line-of-sight visual extinction across the face of NGC 7027 ranges from about 1 to 8 mag. Although the observed nebular size at near-IR wavelengths is comparable to that determined at radio frequencies, indicating that the dust and ionized gas are partially comixed in the H II region, the dust component primarily responsible for the extinction likely resides in a shell, or possibly a disk, outside the volume containing the dust emitting the near-IR thermal continuum.

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