SIMBAD references

2002ApJ...580L.157C - Astrophys. J., 580, L157-L160 (2002/December-1)

A new infrared band in interstellar and circumstellar clouds: C4or C4H.


Abstract (from CDS):

We report on the detection with the Infrared Space Observatory of a molecular band at 57.5 µm (174 cm–1) in carbon-rich evolved stars and in Sgr B2. Taking into account the chemistry of these objects, the most likelihood carrier is a carbon chain. We tentatively assign the band to the ν5bending mode of C4for which a wavenumber of 170-172.4 cm–1 has been derived in matrix experiments by Withey et al. An alternate carrier might be C4H, although the frequency of its lowest energy vibrational bending mode, ν7, is poorly known (130-226 cm–1). If the carrier is C4, the derived maximum abundance is nearly similar to that found for C3in the interstellar and circumstellar media by Cernicharo et al. Hence, tetra-atomic carbon could be one of the most abundant carbon chain molecules in these media.

Abstract Copyright:

Journal keyword(s): Infrared: General - ISM: Individual: Name: Sagittarius B2 - ISM: Lines and Bands - ISM: Molecules - Line: Identification - Stars: Individual: Alphanumeric: CRL 618 - Stars: Individual: Alphanumeric: CRL 2688 - Stars: Individual: Alphanumeric: IRC +10216 - Stars: Individual: Alphanumeric: NGC 7027

Simbad objects: 8

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