NOAO >   Observing Info >   Approved Programs >   2013B-0272

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Proposal Information for 2013B-0272


PI: John Lacy, University of Texas, lacy@astro.as.utexas.edu
Address: Department of Astronomy, 2515 Speedway, C1400, Austin, TX, 78712, USA

CoI: Tie Liu, Peking University
CoI: Matthew Richter, UC Davis
CoI: Daniel Jaffe, University of Texas

Title: A Study of the NGC 7538 IRS 1 high-mass star formation region

Abstract: The pre-main-sequence evolution of forming OB stars, and how they interact with their environments, is poorly understood. We propose to study one of the prototypical high-mass star formation regions, NGC 7538 IRS 1, in mid-infrared ionic and molecular lines. We will study a source within IRS 1 that shows very broad ionic lines to test a disk-wind explanation for the lines. We will observe a He recombination line to measure the spectral type of the source to determine if the star lies to the right of the main sequence, as would be expected if it is still accreting mass. We will search for additional luminosity sources in IRS 1 to see if the stars are forming in a cluster. And we will study molecular absorption that likely forms in a larger ring or disk around IRS 1.


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NOAO >   Observing Info >   Approved Programs >   2013B-0272

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