NOAO >   Observing Info >   Approved Programs >   2018A-0188

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Program Information for 2018A-0188


PI: J J Hermes, U. of North Carolina, jjhermes@unc.edu
Address: Physics Department, UNC Physics, Phillips Hall, Chapel Hill, NC 27599 USA

CoI: J T Fuchs, Texas Lutheran University
CoI: Chris Clemens, U. of North Carolina
CoI: Bart Dunlap, U. of North Carolina
CoI: Erik Dennihy, U. of North Carolina

Title: Constraining the endpoints of stellar rotation as a function of mass

Abstract: We propose to obtain high-S/N, optical spectroscopy with SOAR/Goodman to complement our growing sample of new pulsating white dwarfs discovered and observed with K2, the second-life of the Kepler space telescope. The value added by our SOAR/Goodman spectra is profound, by providing independent estimates of white dwarf atmospheric parameters (effective temperature and surface gravity, and thus mass), which in turn puts significant external constraints on our asteroseismic solutions. The majority of these pulsating white dwarfs have rotation rates determined from their pulsations. When complemented 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 (2018A):  SOAR/Goodman -- 3n on Feb 03 2018, Feb 09 2018, Apr 23 2018
Run 2 (2018A):  SOAR/Goodman -- 2n on Apr 12 - Apr 13 2018


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 >   2018A-0188

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