NOAO >   Observing Info >   Approved Programs >   2014B-0259

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Proposal Information for 2014B-0259


PI: Nick Indriolo, Johns Hopkins University, indriolo@pha.jhu.edu
Address: Department of Physics and Astronomy, Charles and 34th Street, Bloomberg Center, Baltimore, MD, 21218, USA

CoI: David Neufeld, Johns Hopkins University
CoI: Matt Richter, University of California, Davis
CoI: John Lacy, University of Texas, Austin
CoI: Steven Doty, Denison University
CoI: Curtis DeWitt, University of Florida

Title: Chemical and Physical Structure of Massive Protostars

Abstract: Massive protostars are surrounded by both cold infalling envelopes and warm, dense accretion disks where gas is exposed to extreme radiation fields. The conditions in these regions can be constrained by observations of molecular absorption and emission lines, but in many cases the analyses from different species give different results. We propose observations of rotational and ro-vibrational transitions of H2O, C2H2, HCN, and NH3 in the 10-13.5 micron spectral region toward the massive protostars AFGL 2136 and AFG 2591 for the purpose of inferring densities, temperatures, and abundances in the innermost regions of these objects. A comparison of the results will allow us to study the importance of radiative versus collisional excitation and potentially determine whether each species favors a disk or envelope component. In addition, we will compare these sources to the previously observed objects NGC 7538 IRS 1 and IRS 9 to study the evolution of the environment surrounding massive protostars.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2014B-0259

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