# # Program information file # PROGRAM_ID 2021B081 PROGRAM_TITLE Molecular Spectroscopy of NGC7538 IRS9: Testing a Radiative Transfer Model PROGRAM_INV1 John Lacy PROGRAM_INV2 Curtis deWitt PROGRAM_INV3 Matt Richter PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT galactic/interstellar medium PROGRAM_ABSTRACT_BEG Most non-planetary molecular line observations with TEXES have been interpreted with simplified models. A more realistic radiative transfer model has been developed that explains past TEXES observations of the embedded young massive star NGC7538 IRS9. But it does not explain observations of a 3.3 um band of CH4. Observations of the 8 um CH4 band and 13 um bands of C2H2 and HCN will be made to test possible explanations for all of these observations. The broader purpose of the project is to demonstrate the importance of using a realistic radiative transfer model when interpreting observations like these. The data will include high resolution and high S/N spectra of high-J lines of these molecules. PROGRAM_ABSTRACT_END