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LARGE ATOMIC OXYGEN ABUNDANCES OBSERVED TOWARDS MOLECULAR CLOUDS

E. Caux, C. Ceccarelli, C. Vastel, A. Castets, J. P. Baluteau, C. Gry

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Abstract

We present ISO-LWS observations of the [OI] 63 and 145 µm lines towards the molecular cloud L1689N and towards the high mass star formation region W49N. From the analysis of the [OI] lines, we derived the physical parameters of the regions. Combining these observations with CO observations, we obtain [O]/[CO] ∼ 50 towards L1689N and towards the molecular clouds on the line of sight of W49N. In both observed regions, the derived [O]/[CO] ratio implies that up to 98% of gaseous oxygen is in atomic form in the gas phase. If we assume that all the gaseous carbon is locked into the CO (a reasonnable assomption), carbon has to be depleted by more than a factor of 10 with respect to the cosmic abundance.

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What this paper is about

We present ISO-LWS observations of the [OI] 63 and 145 µm lines towards the molecular cloud L1689N and towards the high mass star formation region W49N. From the analysis of the [OI] lines, we derived the physical parameters of the regions. Combining these observations with CO observations, we obtain [O]/[CO] ∼ 50 towards L1689N and towards the molecular clouds on the line of sight of W49N. In both observed regions, the derived [O]/[CO] ratio implies that up to 98% of gaseous oxygen is in atomic form in the gas phase. If we assume that all the gaseous carbon is locked into the CO (a reasonnable assomption), carbon has to be depleted by more than a factor of 10 with respect to the cosmic abundance.

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Available abstract

We present ISO-LWS observations of the [OI] 63 and 145 µm lines towards the molecular cloud L1689N and towards the high mass star formation region W49N. From the analysis of the [OI] lines, we derived the physical parameters of the regions. Combining these observations with CO observations, we obtain [O]/[CO] ∼ 50 towards L1689N and towards the molecular clouds on the line of sight of W49N. In both observed regions, the derived [O]/[CO] ratio implies that up to 98% of gaseous oxygen is in atomic form in the gas phase. If we assume that all the gaseous carbon is locked into the CO (a reasonnable assomption), carbon has to be depleted by more than a factor of 10 with respect to the cosmic abundance.

Key concepts: Atomic carbon, Molecular cloud, Oxygen, Atomic oxygen, Carbon fibers, Astrophysics, Line (geometry), Molecular oxygen

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