A search for interstellar gas-phase CO2 gas: Solid state abundance ratios

E.F. VanDishoeck, F.P. Helmich, T. DeGraauw, J.H. Black, A.C.A. Boogert, P. Ehrenfreund, P.A. Gerakines, J.H. Lacy, TJ Millar, W.A. Schutte, A.G.G.M. Tielens, D.C.B. Whittet, D.R. Boxhoorn, D.J.M. Kester, K. Leech, P.R. Roelfsema, A. Salama, B. Vandenbussche

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Abstract

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 2. 10(-7) with respect to H-2, 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.
Original languageEnglish
Pages (from-to)L349-L352
Number of pages4
JournalAstronomy and Astrophysics
Volume315
Publication statusPublished - 1996

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    VanDishoeck, E. F., Helmich, F. P., DeGraauw, T., Black, J. H., Boogert, A. C. A., Ehrenfreund, P., Gerakines, P. A., Lacy, J. H., Millar, TJ., 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., & Vandenbussche, B. (1996). A search for interstellar gas-phase CO2 gas: Solid state abundance ratios. Astronomy and Astrophysics, 315, L349-L352.