NOAO >   Observing Info >   Approved Programs >   2017A-0212

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Program Information for 2017A-0212


PI: J J Hermes, U. of North Carolina, jjhermes@unc.edu
Address: Dept. of Physics and Astronomy, Phillips Hall - CB No. 3255, Chapel Hill, NC 27599 USA

CoI: Chris Clemens, U. of North Carolina
CoI: Bart H Dunlap, U. of North Carolina
CoI: J T Fuchs, U. of North Carolina
CoI: Erik Dennihy, U. of North Carolina
CoI: Boris T Gaensicke, University of Warwick
CoI: Roberto Raddi, University of Warwick

Title: Leveraging space-based photometry for precision white dwarf parameters and cooling ages

Abstract: Within the next two years, parallaxes from GAIA will allow us to discover hundreds of thousands of new white dwarfs (WDs); creating luminosity functions from these WDs will probe the ages of different Galactic structures. However, precise estimates of WD cooling ages will require we know the empirical range of hydrogen-layer masses and the exact proportion of carbon-oxygen in their cores. Asteroseismology is the only method to probe below the surface and actually measure these values. We propose here detailed spectroscopic observations of the more than 30 pulsating WDs with extended space-based, Kepler photometry, making them the best-studied pulsating WDs ever. This optical spectroscopy is essential to establishing the atmospheric parameters (effective temperature and surface gravity) necessary to fully leverage our extensive space-based photometric observations, making these pulsating WDs critical and representative benchmarks for the fundamental parameters and cooling ages of these stellar remnants.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  SOAR/Goodman -- 3n on Apr 20 - Apr 22 2017
Run 2 (2017A):  SOAR/Goodman -- 2n on Feb 17 2017, May 02 2017


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0212

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