NOAO >   Observing Info >   Approved Programs >   2009A-0209

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Proposal Information for 2009A-0209


PI: Jeff Bary, Colgate University, jbary@colgate.edu
Address: Department of Physics and Astronomy, 13 Oak Drive, Hamilton, NY 13346, USA

CoI: Sean Matt, NASA Ames
CoI: Will Fischer, University of Massachussetts

Title: A Phoenix Variability Study of the He I 1.083 um Accretion/Outflow Signature in a 10 Myr T Tauri Star

Abstract: We propose to use Phoenix on Gemini South to monitor the variability and modulation of the He I 1.083 um spectral feature observed towards the actively accreting, young Sun-like star, TW Hya. In previous spectroscopic observations of TW Hya, this feature shows considerable structure possessing both a blue-shifted component indicative of gas entrained in a fast moving, outflowing wind and a red-shifted component associated with infalling gas. The proposed observations will, for the first time, probe the modulation of the structure and strength of this accretion/outflow signature and correlate these variations with the rotational phase and changes in the mass accretion rate, providing a necessary step toward discriminating between different theoretical models that attempt to explain the outstanding stellar angular momentum problem.


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NOAO >   Observing Info >   Approved Programs >   2009A-0209

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