Title: Constraints on the abundance of solid O-2 in dense clouds from ISO-SWS and ground-based observations
Authors: Vandenbussche, Bart ×
Ehrenfreund, P
Boogert, ACA
van Dishoeck, EF
Schutte, WA
Gerakines, PA
Chiar, J
Tielens, AGGM
Keane, J
Whittet, DCB
Breitfellner, M
Burgdorf, M #
Issue Date: Jun-1999
Publisher: Springer verlag
Series Title: Astronomy and astrophysics vol:346 issue:3 pages:L57-L60
Abstract: The Short Wavelength Spectrometer (SWS) onboard the Infrared Space Observatory (ISO) has been used to search for solid O-2 in cold dense clouds at 6.45 mu m. Additional constraints on the O-2 abundance are obtained from analysis of the 4.67 mu m solid CO absorption profile observed from the ground. We derive upper limits of 50% and 100% of solid O-2 relative to solid CO toward the protostellar sources R CrA IRS2 and NGC 7538 IRS9 respectively, corresponding to abundances of 30 x 10(-6) and 15 x 10(-6) relative to n(H). These results indicate that the abundance of solid O-2 in dense clouds accounts for less than 6% of the total oxygen budget in the interstellar medium. The reservoirs of oxygen in dense clouds are discussed, taking into account recent measurements of oxygen-bearing species.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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