Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...546l.127c&link_type=abstract
The Astrophysical Journal, Volume 546, Issue 2, pp. L127-L130.
Astronomy and Astrophysics
Astronomy
52
Stars: Circumstellar Matter, Infrared: General, Ism: Molecules, Line: Profiles, Stars: Individual: Alphanumeric: Crl 618, Stars: Individual: Alphanumeric: Crl 2688, Stars: Individual: Alphanumeric: Ngc 7027
Scientific paper
We report on the detection with the Infrared Space Observatory of strong infrared absorption from NH3 and C2H4 in CRL 618. The observed NH3 and C2H4 bands arise from a region with kinetic temperatures ~=200 K, i.e., the dense gas in the photodissociation region associated to the dense torus surrounding the central star, as was the case for the polyynes and cyanopolyynes (see the companion Letter). Several absorption bands, probably arising from small gas-phase hydrocarbons, are observed between 5.5 and 11 μm. Two of these species have been identified with the 30 m IRAM telescope as the methylpolyynes CH3C2H and CH3C4H. However, the absorption around 6.2 μm is particularly broad and could arise from the combination of these small hydrocarbons and from the aromatic CC stretching of polycyclic aromatic hydrocarbons of moderate size. These bands and those associated to the polyynes, cyanopolyynes, methylpolyynes, and benzene are not present in the infrared spectrum of the asymptotic giant branch star IRC +10216.
Cernicharo Jose
Dartois Emmanuel
Guélin Michel
Heras Ana M.
Neri Roberto.
No associations
LandOfFree
Methylpolyynes and Small Hydrocarbons in CRL 618 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 Methylpolyynes and Small Hydrocarbons in CRL 618, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methylpolyynes and Small Hydrocarbons in CRL 618 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-922448