SIMBAD references

1996A&A...315L.349V - Astronomy and Astrophysics, volume 315, L349-352 (1996/11-2)

A search for interstellar gas-phase CO2. Gas: solid state abundance ratios.

VAN DISHOECK E.F., HELMICH F.P., DE GRAAUW T., BLACK J.H., BOOGERT A.C.A., EHRENFREUND P., GERAKINES P.A., LACY J.H., MILLAR T.J., SCHUTTE W.A., TIELENS A.G.G.M., WHITTET D.C.B., BOXHOORN D.R., KESTER D.J.M., LEECH K., ROELFSEMA P.R., SALAMA A. and VANDENBUSSCHE B.

Abstract (from CDS):

We present searches for gas-phase CO2 features in the ISO-SWS infrared spectra of four deeply embedded massive young stars, which all show strong solid CO2 absorption. The abundance of gas-phase CO2 is at most 2x10–7 with respect to H2, and is less than 5% of that in the solid phase. This is in strong contrast to CO, which is a factor of 10-100 more abundant in the gas than in solid form in these objects. The gas/solid state ratios of CO2, CO and H2O are discussed in terms of the physical and chemical state of the clouds.

Abstract Copyright: ∼

Journal keyword(s): ISM: abundances - ISM: molecules - ISM: individual: AFGL 2591, AFGL 4176, AFGL 2136, NGC 7538 IRS9 ([WBN74] NGC 7538 IRS 9)

Simbad objects: 6

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