A new timescale for period change in the pulsating da white dwarf WD 0111+0018

J. J. Hermes, M. H. Montgomery, Fergal Mullally, D. E. Winget, A. Bischoff-Kim

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Abstract

We report the most rapid rate of period change measured to date for a pulsating DA (hydrogen atmosphere) white dwarf (WD), observed in the 292.9 s mode of WD 0111+0018. The observed period change, faster than 10-12 s s-1, exceeds by more than two orders of magnitude the expected rate from cooling alone for this class of slow and simply evolving pulsating WDs. This result indicates the presence of an additional timescale for period evolution in these pulsating objects. We also measure the rates of period change of nonlinear combination frequencies and show that they share the evolutionary characteristics of their parent modes, confirming that these combination frequencies are not independent modes but rather artifacts of some nonlinear distortion in the outer layers of the star.

Original languageEnglish (US)
Article number42
JournalAstrophysical Journal
Volume766
Issue number1
DOIs
StatePublished - Mar 20 2013

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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