NOAO >   Observing Info >   Approved Programs >   2012B-0174

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Proposal Information for 2012B-0174


PI: Tara Hufford, University of Georgia, tara@physast.uga.edu
Address: Physics Department

CoI: Inseok Song, University of Georgia
CoI: Adam Schneider, University of Georgia
CoI: Carl Melis, University of California, San Diego
CoI: Ben Zuckerman, University of California, Los Angeles

Title: Debris disks in the Scorpius-Centaurus OB Association

Abstract: The Scorpius-Centaurus OB Association (ScoCen) is the nearest massive star formation site. Because of its proximity to Earth, and the age gradient across its three subgroups, ScoCen is ideal for the study of young debris disk stars. Nearby (distance\lesssim150 pc) debris disks stars are more useful than distant counterparts because they are brighter and generally have better measured stellar/disk parameters, which can then be extrapolated to greater distances. Using a state-of- the-art photosphere fitting method that includes the most recent Wide- Field Infrared Survey Explorer (WISE) data, we selected many candidate infrared excess stars in at least one WISE passband. These candidate stars already passed criteria based on their kinematics and photometric distance required to be ScoCen members. Since a non-negligible fraction of old field stars often exhibit mid-infrared excess, we need to confirm the youth of these selected WISE excess stars. Selected targets are bright enough for obtaining optical spectra using the Cass Spectrograph on the CTIO 1.5-m telescope. The goal of this proposal is to obtain optical spectroscopy of infrared excess candidates throughout ScoCen found with WISE to confirm their association membership.


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NOAO >   Observing Info >   Approved Programs >   2012B-0174

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