Back to Volume
Paper: The ratio N(CO)/E(J-K) in globules
Volume: 132, Star Formation with the Infrared Space Observatory (ISO)
Page: 358
Authors: Harjunpaa, P.
Abstract: We have investigated the ratio of carbon monoxide column density to colour excess E(J-K) of background field stars in the direction of three different globules: B133, B335 and L466. The 12CO, 13CO and C18O J=1-0 and J=2-1 observations towards the chosen background stars were obtained using the 15-m Swedish-ESO Submillimeter Telescope (SEST). The colour excess values are available from the literature. The N(CO) to E(J-K) ratio was found to vary from cloud to cloud: it is larger in the active star forming globule B335 than in more quiescent globules B133 and L466. Our results can be understood in two alternative ways, either the N(CO)/N(H2) ratio is higher in active star forming regions (B335) than in regions without star formation (B133, L466), or the ratio N(H2)/E(J-K) changes from cloud to cloud and is higher in active star forming regions than in quiescent clouds.
Back to Volume