NOAO >   Observing Info >   Approved Programs >   2018B-0138

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Program Information for 2018B-0138


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

CoI: Chris Clemens, U. of North Carolina
CoI: Bart H Dunlap, U. of North Carolina
CoI: Joshua Reding, U. of North Carolina
CoI: Ben Kaiser, U. of North Carolina

Title: Measuring the endpoints of stellar rotation

Abstract: We propose to obtain high-S/N, optical spectroscopy with SOAR/Goodman to complement our growing sample of what could approach 100 pulsating white dwarfs 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 (2018B):  SOAR/Goodman -- 2n on Sep 01 - Sep 02 2018
Run 2 (2018B):  SOAR/Goodman -- 2n on Dec 29 - Dec 30 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 >   2018B-0138

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