The rate of period change in pulsating DB white dwarf stars

Abstract

In this work, we present the theoretically expected rates of pulsation period change for V777 Her (DBV) variable stars. To this end we employ new evolutionary models representative of pulsating DB white dwarf stars computed in a self-consistent way with the predictions of time-dependent element diffusion. At the hot edge of the DB instability strip, the envelopes of the models are characterized by a diffusion-induced double-layered chemical structure. We compute the numerical values of rates of period change by solving the equations of linear, adiabatic, nonradial stellar oscillations. We examine the effects of varying the stellar mass, the mass of the helium envelope and the neutrino emission on the expected period changes. We present extensive tabulations of our results which could be useful for comparison with future detections of the rate of period change in pulsating DB white dwarfs.

arXiv comment13 pages, including 5 postscript figures and 9 tables. Accepted for publication in Astronomy and Astrophysics

References in corpus (13)

• The cooling of CO white dwarfs: influence of the internal chemical distribution
• A Strong Test of Electro-Weak Theory using Pulsating DB White Dwarf Stars as Plasmon Neutrino Detectors
• New evolutionary models for massive ZZ Ceti stars: I. First results for their pulsational properties
• The potential of the variable DA white dwarf G117-B15A as a tool for Fundamental Physics
• Measuring ^{12}C(&alpha,&gamma)^{16}O from White Dwarf Asteroseismology
• Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known
• Thick to Thin: The Evolutionary Connection Between PG 1159 Stars and the Thin Helium-Enveloped Pulsating White Dwarf GD 358
• Preliminary Constraints on 12C(alpha,gamma)16O from White Dwarf Seismology
• Genetic-Algorithm-based Asteroseismological Analysis of the DBV White Dwarf GD 358
• The Predicted Signature of Neutrino Emission in Observations of Pulsating Pre-White Dwarf Stars
• Probing the core and envelope structure of DBV white dwarfs
• The double-layered chemical structure in DB white dwarfs
• New DA white dwarf evolutionary models and their pulsational properties

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• Asteroseismology of the Kepler field DBV White Dwarf - It's a hot one!
• Pulsating low-mass white dwarfs in the frame of new evolutionary sequences: IV. The secular rate of period change
• An observer's view on the future of asteroseismology