Pulsating white dwarfs: new insights

Abstract

White dwarf stars constitute the final evolutionary stage for more than 95 per cent of all stars. The Galactic population of white dwarfs conveys a wealth of information about several fundamental issues and are of vital importance to study the structure, evolution and chemical enrichment of our Galaxy and its components ---including the star formation history of the Milky Way. In addition, white dwarfs are tracers of the evolution of planetary systems along several phases of stellar evolution. Also, white dwarfs are used as laboratories for astro-particle physics, being their interest focused on physics beyond the standard model. The last decade has witnessed a great progress in the study of white dwarfs. In particular, a wealth of information of these stars from different surveys has allowed us to make meaningful comparison of evolutionary models with observations. While some information like surface chemical composition, temperature and gravity of isolated white dwarfs can be inferred from spectroscopy, and the total mass and radius can be derived as well when they are in binaries, the internal structure of these compact stars can be unveiled only by means of asteroseismology, an approach based on the comparison between the observed pulsation periods of variable stars and the periods predicted by appropriate theoretical models. The asteroseismological techniques allow us to infer details of the internal chemical stratification, the total mass, and even the stellar rotation profile. In this review, we first revise the evolutionary channels currently accepted that lead to the formation of white-dwarf stars, and then, we give a detailed account of the different sub-types of pulsating white dwarfs known so far, emphasizing the recent observational and theoretical advancements in the study of these fascinating variable stars.

104 pages, 25 figures, 14 tables. To be published in The Astronomy and Astrophysics Review

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• Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling
• Evolution of a Long-Lived Deep-Seated Main-Sequence Magnetic Field During White Dwarf Cooling
• Seismic test of the mass-radius relationship of hydrogen-atmospheric white dwarf stars
• The oscillation properties of the Blue Large Amplitude Pulsators (BLAPs): relative change rate of periods, excitations, and period relations
• Asteroseismic study of KUV03442+0719 with parallax constraints
• Constraints from parallaxes and average period spacings in the asteroseismic study of 8 DAVs
• A comparison of best fits obtained in white dwarf asteroseismology using the WDEC and the LPCODE
• Asteroseismic Imprints of Mass Transfer in Binary Stars: Probing the Interiors of Donors and Accretors with Gravity and Acoustic Modes
• A systematic study of the connection between white dwarf period spectra and model structure
• QCD axion and Neutrino induced by Hidden flavor structure
• Asteroseismology
• A new instability domain of CNO-flashing low-mass He-core stars on their early white-dwarf cooling branches
• Ultra low-mass and small-radius white dwarfs made of heavy elements
• An introduction to axions and their detection
• Studying the radiation of a white dwarf star falling onto a black hole
• GD 99: Re-investigation of an old ZZ Ceti companion
• Exploring Late Stellar Evolution in the Era of Large Surveys: Machine Learning Prospects for Hot Subdwarfs and White Dwarfs
• Asteroseismology of the ZZ Ceti star WD 1310+583 using the Transiting Exoplanet Survey Satellite
• Asteroseismology of the DAV star R808
• A triplet of the only pulsation mode detected in the DAV star G132-12