Large atomic oxygen abundance towards the molecular cloud L1689N

Details Large atomic oxygen abundance towards the molecular cloud L1689N Large atomic oxygen abundance towards the molecular cloud L1689N

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347l...1c&link_type=abstract

Astronomy and Astrophysics, v.347, p.L1-L4 (1999)

Astronomy and Astrophysics

Astrophysics

46

Stars: Formation, Ism: Jets And Outflows, Ism: Individual Objects: L1689N, Infrared: Ism: Lines And Bands

Scientific paper

We present spectroscopic ISO-LWS observations of the [OI] (63 mu m and 145 mu m), the [CII] (158 mu m) and the H_2O (179 mu m) lines towards the molecular cloud L1689N. From the observed ratio of the two [OI] lines, we deduce a mean gas temperature of (26 +/-0.5) K, an H2 density >= 3 x 10(4) cm(-3) and an [OI] column density >= 5 x 10(19) cm(-2) . Combining these observations with previous CO observations, we obtain [OI]/[CO] ~ 50. This ratio implies that up to 98% of oxygen abundance is in atomic form in the gas phase. Furthermore, assuming all the gaseous carbon is locked into the CO, carbon has to be depleted by more than a factor 24. Finally, the upper limit derived for the H_2O (179 mu m) line (3 x 10(-13) erg s(-1) cm(-2) ) implies that the water abundance in this region is less than 6 x 10(-7) with respect to H nuclei. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) with the participation of ISAS and NASA.

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