A search for interstellar gas-phase CO_2_. Gas: solid state abundance ratios.

Details A search for interstellar gas-phase CO_2_. Gas: solid state abundance ratios. A search for interstellar gas-phase CO_2_. Gas: solid state abundance ratios.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.349v&link_type=abstract

Astronomy and Astrophysics, v.315, p.L349-L352

Astronomy and Astrophysics

Astrophysics

86

Ism: Abundances, Ism: Molecules, Ism: Individual: Afgl 2591, Afgl 4176, Afgl 2136, Ngc 7538 Irs9

Scientific paper

We present searches for gas-phase CO_2_ features in the ISO-SWS infrared spectra of four deeply embedded massive young stars, which all show strong solid CO_2_ absorption. The abundance of gas-phase CO_2_ is at most 2x10^-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 CO_2_, CO and H_2_O are discussed in terms of the physical and chemical state of the clouds.

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