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Astrochemistry of Sub-Millimeter Sources in Orion: Studying the Variations of Molecular Tracers with Changing Physical Conditions
Doug Johnstone, Annemieke M. S. Boonman, Ewine F. van Dishoeck
Cornerstone molecules (CO, H_2CO, CH_3OH, HCN, HNC, CN, CS, SO) were observed toward seven sub-millimeter bright sources in the Orion molecular cloud in order to quantify the range…
Indications for grain growth and mass decrease in cold dust disks around Classical T Tauri stars in the MBM 12 young association
Michiel R. Hogerheijde, Doug Johnstone, Isamu Matsuyama +2
We report detection of continuum emission at 850 and 450 micron from disks around four Classical T Tauri stars in the MBM 12 (L1457) young association. Using a simple model we infe…
The G11.11-0.12 Infrared-Dark Cloud: Anomalous Dust and a Non-Magnetic Isothermal Model
Doug Johnstone, Jason Fiege, R. O. Redman +2
The G11.11-0.12 Infrared-Dark Cloud has a filamentary appearance, both in absorption against the diffuse 8micron Galactic background, and in emission from cold dust at 850micron. D…