NOAO >   Observing Info >   Approved Programs >   2017B-0125

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Program Information for 2017B-0125


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: Measuring the endpoints of angular momentum evolution in low- and intermediate-mass stars

Abstract: We propose to obtain high-S/N, optical spectroscopy with SOAR/Goodman to compliment our growing sample of new pulsating white dwarfs discovered and observed with K2, the second-life of the Kepler space telescope. Our SOAR/Goodman spectra will provide robust estimates of white dwarf atmospheric parameters (effective temperature and surface gravity, and thus mass), which provide significant external constraints on our asteroseismic solutions. Many of these white dwarfs have rotation rates determined from their pulsations, and spectroscopically determined masses are necessary to put these rotation rates into the context of angular momentum transport of their low- and intermediate- mass progenitors. When complimented with SOAR/Goodman spectroscopy, our complete K2 dataset will set foundational constraints on the endpoints of angular momentum in stars covering a wide range of progenitors, spanning roughly 1-5 solar-mass stars on the main sequence.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  SOAR/Goodman -- 2n on Nov 11 2017, Nov 16 2017
Run 2 (2017B):  SOAR/Goodman -- 1n on Nov 26 2017


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NOAO >   Observing Info >   Approved Programs >   2017B-0125

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