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

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Proposal Information for 2011A-0465


PI: John P. Subasavage, Cerro Tololo Inter-American Observatory, jsubasavage@ctio.noao.edu
Address: Casilla 603, La Serena, Chile

CoI: Sebastien Lepine, American Museum of Natural History

Title: Identifying New Nearby White Dwarfs in the Southern Hemisphere

Abstract: We propose to use the Goodman Spectrograph at SOAR to spectroscopically confirm nearby white dwarfs (WDs) in the solar neighborhood. By utilizing an extensive list of high proper motion targets from the proprietary SUPERBLINK database in the southern hemisphere, we have identified ~600 candidate WD systems. Using photometric distance relations, we estimate that ~120 are within 40 pc, including ~20 that are within the NStars horizon of interest, 25 pc. Upon spectroscopic confirmation, we intend to select targets estimated to be within 25 pc to be added to the CTIO Parallax Investigation (CTIOPI) to obtain trigonometric parallaxes and ensure sample membership. From these data, we continue to push toward a complete volume-limited sample of WDs that we can evaluate for myriad distributions (e.g., chemical, multiplicity, velocity) and reliably extrapolate to much larger spatial scales within our Galaxy.


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