NOAO >   Observing Info >   Approved Programs >   2011B-0465

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Proposal Information for 2011B-0465


PI: J. Allyn Smith, Austin Peay State University, smithj@apsu.edu
Address: Physics Department, 601 College St.; P.O. Box 4608, Clarksville, TN 37044, USA

CoI: Douglas L. Tucker, Fermilab
CoI: Chow Choong Ngeow, National Central University
CoI: Melissa Butner, Austin Peay State University
CoI: Joe Mohr, Universitaets-Sternwarte Muenchen
CoI: Sahar S. Allam, Fermilab
CoI: Susana E. Deustua, STScI

Title: Targeted Samples of the Hot Stellar Content in the Blanco Cosmology Survey

Abstract: We request observing time on the Blanco + MOSAIC II (plus ancillary calibration time on the CTIO-1m) to obtain u-band imaging data for targeted regions within the footprint of the Blanco Cosmology Survey (BCS). These data will supplement the existing BCS griz data to enhance stellar content studies. The u-band data are critical in separating F-type turn-off stars, BHB stars, and moderate redshift QSOs, and in distinguishing the various A-type stars (hot white dwarfs, RR Lyr, sdA). These data will also aid in identification of hot white dwarfs which will be used as calibration objects for later surveys which include the BCS area (specifically the DES, which begins in October 2011, and LSST). Part of this effort will be an extensive calibration program to completely tie the u-band data to the existing griz data collected for BCS during the NOAO Surveys Program (Joe Mohr, PI). We note that, with the imminent retirement of the Mosaic II image, such studies will soon be impossible from the Blanco for the foreseeable future, since a u-band will not be part of the initial complement of filters available for use with the Dark Energy Camera (DECam). Due to the substantial expected cost of such a DECam u-band filter, it may be some time before the ability to perform u-band studies will return to the Blanco.


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