Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..120b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 120-123.
Astronomy and Astrophysics
Astronomy
7
Infrared Astronomy Satellite, Infrared Spectra, Planetary Nebulae, Red Giant Stars, Star Formation, Emission Spectra, Interstellar Matter, Line Spectra, Visible Spectrum
Scientific paper
Multiaperture 3-4-micron spectra along with K- and L-band images of the compact planetary nebula IRAS 21282 + 5050 show a 5 arcsec - 20 arcsec diameter nebula with structure similar to many other planetary nebulae. The spectral observations and the L-band image show evidence for extended PAH emission out to a radius of 20 arcsec, while the K-band image shows a 5 arcsec diameter nebula. An observed linear increase of integrated brightness with aperture size at L band implies a 1/r exp 2 volume emissivity for a spherically symmetric model. The spectral similarity of the emission in the small and large apertures suggests fluorescent emission by the PAHs. If the observed emission is from PAHs which formed during the planetary nebulae stage of IRAs 21282 + 5050, then PAHs have been forming for not less than 3000 yr. If the PAH emission is from material produced during the earlier red giant phase, then the formation time frame was much longer. The morphological and spectral similarity of IRAS 21282 + 5050 to many other planetary nebulae suggests that this phenomenon may be widespread, and that planetary nebulae may be a significant source of interstellar PAHs.
Booth John
Bregman Jesse D.
Gilmore David Kirk
Kay Laura
Rank David
No associations
LandOfFree
Extended infrared emission around IRAS 21282 + 5050 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extended infrared emission around IRAS 21282 + 5050, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extended infrared emission around IRAS 21282 + 5050 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1765782