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Program Information for 2018B-0095


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

CoI: Douglas Tucker, FNAL
CoI: Sahar Allam, FNAL
CoI: Deborah J Gulledge, Austin Peay State U.
CoI: William Wester, FNAL
CoI: Jamin Welch, Austin Peay State U.
CoI: John Marriner, FNAL

Title: Targeted Samples of the Hot Stellar Content in the Southern Sky

Abstract: This proposal is a continuation of our effort to identify the hot stellar component -- in particular, pure-hydrogen-atmosphere (``DA'') white dwarfs -- in the Southern sky. These objects are vital for the absolute color calibration of current and future Southern Sky CCD-based imaging surveys and facilities, such as the Dark Energy Survey (DES) and the Large Synoptic Survey Telescope. In our earliest runs, we primarily identified candidate hot stars by performing $u,g$-band imaging within the Blanco Cosmology Survey, PreCam Survey fields and SuperCOSMOS survey (Rowell & Hambly, 2011) within the DES footprint. To date, our CTIO- 0.9m imaging campaign has observed $sim0 white dwarfs and white dwarf candidates, and our SOAR-4m program has netted 113 spectroscopically confirmed and modeled DA white dwarfs. Building on our previous success, we propose for 2018B (1) to continue CTIO-0.9m $u,g$-band imaging of potential white dwarfs within the DES footprint; (2) to continue to obtain full $ugriz$ imaging for potentially hot white dwarfs from the SuperCOSMOS survey (Rowell & Hambly, 2011); and (3) to continue to perform medium-resolution spectroscopy with the SOAR telescope to classify our candidates from our previous imaging runs, as well as candidates from other sources (e.g., from VST-ATLAS and from {em GAIA/}), in order to determine their effective surface temperatures and surface gravities. In addition to providing calibration stars for future surveys and facilities, this data set will permit studies of the white dwarf luminosity function and of Galactic structure.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018B):  CT-0.9m/CFIM -- 7n on Oct 19 - Oct 25 2018
Run 2 (2018B):  SOAR/Goodman -- 5n on Sep 28 - Oct 02 2018
Run 3 (2018B):  SOAR/Goodman -- 3n on Jan 25 - Jan 27 2019
Run 3 (2019A):  SOAR/Goodman -- 1n on Feb 21 2019


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