skip to main content

Title: Precision asteroseismology of the pulsating white dwarf GD 1212 using a two-wheel-controlled Kepler spacecraft

We present a preliminary analysis of the cool pulsating white dwarf (WD) GD 1212, enabled by more than 11.5 days of space-based photometry obtained during an engineering test of the two-reaction-wheel-controlled Kepler spacecraft. We detect at least 19 independent pulsation modes, ranging from 828.2-1220.8 s, and at least 17 nonlinear combination frequencies of those independent pulsations. Our longest uninterrupted light curve, 9.0 days in length, evidences coherent difference frequencies at periods inaccessible from the ground, up to 14.5 hr, the longest-period signals ever detected in a pulsating WD. These results mark some of the first science to come from a two-wheel-controlled Kepler spacecraft, proving the capability for unprecedented discoveries afforded by extending Kepler observations to the ecliptic.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ;  [3] ;  [4] ;  [5] ;  [6] ; ; ;  [7] ;  [8]
  1. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
  2. Université de Toulouse, UPS-OMP, IRAP, Toulouse F-75205 (France)
  3. NASA Ames Research Center, Moffett Field, CA 94035 (United States)
  4. Institute of Theoretical Physics and Astronomy, Vilnius University, Gostauto 12, Vilnius LT-01108 (Lithuania)
  5. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States)
  6. Department of Astrophysics, IMAPP, Radboud University Nijmegen, P.O. Box 9010, NL-6500 GL Nijmegen (Netherlands)
  7. Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712 (United States)
  8. Institut d'Astrophysique et de Géophysique, Université de Liège, 17 Allée du 6 Août, B-4000 Liège (Belgium)
Publication Date:
OSTI Identifier:
22356458
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 789; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; EV RANGE; OSCILLATIONS; PHOTOMETRY; SPACE; SPACE VEHICLES; STAR EVOLUTION; VISIBLE RADIATION; WHITE DWARF STARS