The dispersion of period spacing for DAV stars

Abstract

Three groups of DAV star models are evolved with time-dependent element diffusion by \texttt{WDEC}. The core compositions of these models are directly from white dwarf models evolved by \texttt{MESA}, which are results of thermonuclear burning. Based on these DAV star models, we try to study the dispersion of period spacing. The thickness of hydrogen atmosphere can seriously affect the deviation degree of minimal period spacings. The minimal period spacings dominate the dispersion of period spacing. The thinner the hydrogen atmosphere, basically, the more dispersive the period spacing. Standard deviations are used to analyze the dispersion of period spacing. Studying the dispersion of period spacing on a DAV star KUV03442+0719 preliminarily, we suggest that log($M_{\mathrm{H}}/M_{\ast }$) is from -8.5 to -5.5. In addition, modes partly trapped in C/O core are found based on those DAV star models. The identified modes and average period spacings indicate that KUV03442+0719 may be the first star to 'observe' modes partly trapped in C/O core.

arXiv comment11 pages, 14 figures, accepted by MNRAS in February 18, 2016

References in corpus (20)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Element Diffusion in the Solar Interior
• Pulsating White Dwarf Stars and Precision Asteroseismology
• A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
• Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
• The Effect of Crystallization on the Pulsations of White Dwarf Stars
• Towards an Empirical Determination of the ZZ Ceti Instability Strip
• New chemical profiles for the asteroseismology of ZZ Ceti stars
• Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known
• Whole Earth Telescope observations of BPM 37093: a seismological test of crystallization theory in white dwarfs
• Mapping the ZZ Ceti Instability Strip: Discovery of 6 New Pulsators
• The pulsation modes of the pre-white dwarf PG 1159-035
• The mode trapping properties of full DA white dwarf evolutionary models
• Asteroseismology of the ZZ Ceti star HS 0507+0434B
• New developments of the ZZ Ceti instability strip: The discovery of eleven new variables
• Asteroseismic constraints on diffusion in WD envelopes
• Asteroseismology of the ZZ Ceti star KUV 11370+4222
• The pulsating DA white dwarf star EC 14012-1446: results from four epochs of time-resolved photometry
• On mode trapping in pulsating DA white dwarf stars
• Asteroseismology of DAV star EC14012-1446, mode identification and model fittings

Cited by in corpus (2)

• Toward High Precision Seismic Studies of White Dwarf Stars: Parametrization of the Core and Tests of Accuracy
• The rate of period change in DAV stars