Detection of the overtone of the 3.3 micron emission feature in IRAS 21282+5050

Details Detection of the overtone of the 3.3 micron emission feature in IRAS 21282+5050 Detection of the overtone of the 3.3 micron emission feature in IRAS 21282+5050

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434l..15g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 434, no. 1, p. L15-L18

Astronomy and Astrophysics

Astronomy

31

Astronomical Models, Emission Spectra, Interstellar Matter, Planetary Nebulae, Polycyclic Aromatic Hydrocarbons, Chemical Bonds, Infrared Astronomy Satellite, Infrared Spectra

Scientific paper

The 1.6-1.8 micron spectrum of the planetary nebula, IRAS 21282+5050, a strong emitter of the unidentified interstellar bands, contains a 0.02 micron wide eimission feature centered at 1.680 micron, which is well matched by laboratory spectra of the 0-2 CH stretching mode in polycyclic aromatic hydrocarbons (PAHs). We identify the new feature as the overtone of the well-known 3.3 micron band. In view of the high excitation required for emission in this band, the identification indicates that the emission is by free molecules rather than molecular moieties in solid dust grains. Modeling of the intensity ratio of the 2-0 to 1-0 band implied that the PAHs emitting in these bands contain about 60 carbon atoms. It is inferred that the nu = 2-1 hot band of the CH stretching mode occurs at about 3.43 micron and contributes to the long-wavelength shoulder of the 3.40 micron feature. The main 3.40 micron feature probably is due to aliphatic sidegroups on PAH molecules.

Affiliated with

Also associated with

No associations

Rating

Detection of the overtone of the 3.3 micron emission feature in 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 Detection of the overtone of the 3.3 micron emission feature in IRAS 21282+5050, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of the overtone of the 3.3 micron emission feature in IRAS 21282+5050 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1070540