NOAO >   Observing Info >   Approved Programs >   2013A-0405

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Proposal Information for 2013A-0405


PI: Kevin Covey, Lowell Observatory, kcovey@lowell.edu
Address: 1400 W. Mars Hill Road, Flagstaff, Arizona 86001, United States

CoI: Lisa Prato, Lowell Observatory
CoI: Guillermo Torres, Harvard-Smithsonian Center for Astrophysics
CoI: Gabor Furesz, Harvard-Smithsonian Center for Astrophysics
CoI: Andrew Szentgyorgyi, Harvard-Smithsonian Center for Astrophysics
CoI: Ann Marie Cody, Infrared Processing and Analysis Center

Title: A coordinated optical/NIR survey for low-mass pre-main sequence binaries in NGC 2264

Abstract: Pre-main sequence binaries are critical laboratories for validating theoretical models of star formation and early stellar evolution. Identifying young binaries, however, is challenging: changes in a young star's accretion rate, or in the projected area of photospheric star- spots, induce high levels of photometric and spectroscopic variability that can easily mask eclipses and/or radial velocity variations due to low-mass companions. We propose to use 1.5 nights of Hectochelle/MMT observations, in coordination with an approved ancillary science program with the SDSS-III APOGEE NIR spectrograph, to conduct a coordinated optical/NIR search for spectroscopic binaries in NGC 2264, a rich Galactic star forming region. Combining these contemporaneous optical and NIR spectra, we will identify several new bona-fide pre-main sequence spectroscopic binaries and provide preliminary characterizations of their orbits to inform subsequent follow-up observations with single-object spectrographs. Using additional fibers, we will acquire new epochs for 6 known spectroscopic binaries, characterize highly variable YSOs identified in joint CoroT/Spitzer monitoring of NGC 2264, and calibrate the relationship between a star's optical RV jitter and the level of accretion or chromospheric activity indicated by its H_(alpha) line strength.


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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