NOAO >   Observing Info >   Approved Programs >   2010B-0412

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Proposal Information for 2010B-0412


PI: Kevin R. Covey, Cornell University, kcovey@astro.cornell.edu
Address: Department of Astronomy, 226 Space Sciences Bldg, Ithaca, NY 14853, USA

CoI: Jan Forbrich, Harvard-Smithsonian Center for Astrophysics
CoI: Rob Gutermuth, Smith College/UMASS Amhurst
CoI: John Stauffer, Spitzer Science Center
CoI: Maria Morales-Calderon, Spitzer Science Center
CoI: Luisa Rebull, Spitzer Science Center
CoI: Peter Plavchan, NASA Exoplanet Science Institute
CoI: Tom Megeath, University of Toledo

Title: Confirming X-ray Triggered Disk Accretion With K Band Spectroscopy

Abstract: The Ceph C star forming region will be monitored in Sept. 2010 by both the Chandra X-ray Observatory and Spitzer Space Telescope. These observations will link stellar X-ray flares with mid-IR disk afterglows, indicating how coronal emission affects the temperature or structure of circumstellar disks. We propose to use the MOIRCS and TripleSpec spectrographs at the Subuaru and Palomar Observatories to obtain multi-epoch K band spectroscopy for ~80 young stellar objects (YSOs) in Ceph C. These spectra will: a) measure temperature sensitive spectral features (e.g., CO, H_2O, Na, Ca) to establish each YSO's temperature, and thus mass, and b) diagnose the strength of the Brackett Gamma (HI) emission line, providing an estimate of the central star's mass accretion rate. These spectra will provide a unique characterization of each YSOs photosphere, complementing the coronal and disk variability captured by our contemporaneous Chandra and Spitzer observations. Interpreting these data in tandem will inform our understanding the star-disk connection at young ages and advance our understanding of the physical processes governing star and planet formation.


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