A comparison of best fits obtained in white dwarf asteroseismology using the WDEC and the LPCODE

Abstract

We perform the asteroseismic fitting of 4 DAVs using a grid of WDEC models with chemical pro- files that closely mimic those of the LPCODE models and compare them with published asteroseis- mic fitting results using the LPCODE (Romero et al. 2017). These 4 objects are KIC 11911480, J113655.17+040952.6, KIC 4552982, and GD1212. The similarities in the results in those controlled experiments point to a consistency in the models. Given similar input, the LPCODE and the WDEC make similar models and calculate similar periods. We further perform the asteroseismic fitting of the same 4 DAVs by relaxing the constraints on the chemical profiles. We explore the effects of different methods for weighing the modes when calculating the goodness of fit of the models, as well as the effect of only including a subset of the known period spectrum. Such numerical experiments can help place recent and future efforts in pipeline fitting of numerous DAVs and DBVs using the WDEC on firmer footing (Hall et al. 2023).

arXiv comment12 pages, 7 figures, published in the Astrophysical Journal

References in corpus (29)

• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
• The Remarkable Deaths of 9 - 11 Solar Mass Stars
• Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs
• Pulsating white dwarfs: new insights
• White Dwarf Rotation as a Function of Mass and a Dichotomy of Mode Linewidths: Kepler Observations of 27 Pulsating DA White Dwarfs Through K2 Campaign 8
• New evolutionary models for massive ZZ Ceti stars: I. First results for their pulsational properties
• Ensemble Characteristics of the ZZ Ceti stars
• Measuring ^{12}C(&alpha,&gamma)^{16}O from White Dwarf Asteroseismology
• New chemical profiles for the asteroseismology of ZZ Ceti stars
• Seismological studies of ZZ Ceti stars. I. The model grid and the application to individual stars
• White Dwarf Asteroseismology and the ^12C(alpha,gamma)^16O Rate
• Fe emission and ionized excess absorption in the luminous quasar 3C109 with XMM-Newton
• The Aarhus Red Giants Challenge I: Stellar structures in the red giant branch phase
• KIC 4552982: Outbursts and Asteroseismology from the Longest Pseudo-Continuous Light Curve of a ZZ Ceti
• KIC11911480: the second ZZ Ceti in the $Kepler$ field
• Asteroseismology of the ZZ Ceti star HS 0507+0434B
• Empirical Determination of Convection Parameters in White Dwarfs I : Whole Earth Telescope Observations of EC14012-1446
• WDEC - A code for modeling white dwarf structure and pulsations
• Evidence for Temperature Change and Oblique Pulsation from Light Curve Fits of the Pulsating White Dwarf GD 358
• Discovery of a ZZ Ceti in the Kepler Mission Field
• Evolution of a 3 \msun star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
• The search for ZZ Ceti stars in the original Kepler mission
• G 207-9 and LP 133-144: light curve analysis and asteroseismology of two ZZ Ceti stars
• On the systematics of asteroseismological mass determinations of PG1159 stars
• Seismological Studies of Pulsating DA White Dwarfs Observed with the Kepler Space Telescope and K2 Campaigns 1-8
• A systematic study of the connection between white dwarf period spectra and model structure
• Asteroseismic study of KUV03442+0719 with parallax constraints