NOAO >   Observing Info >   Approved Programs >   2009B-0070

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Proposal Information for 2009B-0070


PI: Jeff Valenti, Space Telescope Science Institute, valenti@stsci.edu
Address: 3700 San Martin Dr, Baltimore, MD 21218, USA

CoI: Greg Herczeg, MPE (Garching)
CoI: Suzan Edwards, Smith College
CoI: Christopher Johns-Krull, Rice University
CoI: David Ardila, Spitzer Science Center
CoI: Frederick Walter, Stony Brook University

Title: Simultaneity of Accretion and Outflow in Young Stars

Abstract: The character of magnetospheric accretion and the launching of winds in the star-disk interaction region are intimately connected to the early evolution of young stars and protoplanetary disks. We seek to understand accretion and outflow processes by using Gemini/Phoenix to obtain high-resolution spectra of \ionHe1 1.083 (mu)m, which is an excellent diagnostic of wind and funnel flow geometry. The Gemini observations will be obtained nearly simultaneously with HST/COS+STIS spectra of UV diagnostics of the accretion flow and outflow. This powerful combination of indicators will provide the temperature and opacity at the base of the wind, will reveal how energy is transfered from the accretion shock to the star, and will constrain the structure and origin of these flows. Our approved HST large program (11616, PI: Herczeg) targets pre-main- sequence stars that span 3 orders of magnitude in disk accretion rate. This Gemini proposal focuses on southern targets in the HST program. Accretion and outflow indicators can vary on a daily timescale, so we seek \ionHe1 1.083 (micron) observations within 1 day of the HST observations. Because HST schedules are not finalized until a couple of weeks before the observation, the Gemini observations must be treated as a ``standard'' target of opportunity.


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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