NOAO > Observing Info > Approved Programs > 2009A-0209
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NOAO > Observing Info > Approved Programs > 2009A-0209 |
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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.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2009A-0209 |
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