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

doi:10.1088/0004-637X/766/1/42

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

Penn State Scranton

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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 language	English (US)
Article number	42
Journal	Astrophysical Journal
Volume	766
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/766/1/42
State	Published - Mar 20 2013

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/766/1/42

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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.",

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T1 - A new timescale for period change in the pulsating da white dwarf WD 0111+0018

AU - Hermes, J. J.

AU - Montgomery, M. H.

AU - Mullally, Fergal

AU - Winget, D. E.

AU - Bischoff-Kim, A.

PY - 2013/3/20

Y1 - 2013/3/20

N2 - 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.

AB - 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.

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

Abstract

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