Pulsating white dwarfs: new insights

  title={Pulsating white dwarfs: new insights},
  author={Alejandro H. C{\'o}rsico and Leandro G. Althaus and Marcelo Miguel Miller Bertolami and S. O. Kepler},
  journal={The Astronomy and Astrophysics Review},
Stars are extremely important astronomical objects that constitute the pillars on which the Universe is built, and as such, their study has gained increasing interest over the years. White dwarf stars are not the exception. Indeed, these stars constitute the final evolutionary stage for more than 95% 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… 

A pulsating white dwarf in an eclipsing binary

White dwarfs are the burnt-out cores of Sun-like stars and are the fate of 97 per cent of the stars in our Galaxy. The internal structure and composition of white dwarfs are hidden by their high

Forever young white dwarfs: When stellar ageing stops

White dwarf stars are the most common end point of stellar evolution. The ultramassive white dwarfs are of special interest as they are related to type Ia supernovae explosions, merger events, and

White-Dwarf Asteroseismology With the Kepler Space Telescope

  • A. C'orsico
  • Physics, Geology
    Frontiers in Astronomy and Space Sciences
  • 2020
In the course of their evolution, white-dwarf stars go through at least one phase of variability in which the global pulsations they undergo allow astronomers to peer into their interiors, making it

A highly magnetized and rapidly rotating white dwarf as small as the Moon.

Observations of a white dwarf, ZTF J190132.9+145808.7, that exhibits these properties, but to an extreme: a rotation period of 6.94 minutes, a magnetic field ranging between 600  megagauss and 900 megagauss over its surface, and a stellar radius of [Formula: see text] kilometres, only slightly larger than the radius of the Moon.

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS

Context. The recent arrival of continuous photometric observations of unprecedented quality from space missions has strongly promoted the study of pulsating stars and caused great interest in the

The Missing Link? Discovery of Pulsations in the Nitrogen-rich PG 1159 Star PG 1144+005

Up to 98% of all single stars will eventually become white dwarfs—stars that link the history and future evolution of the Galaxy, and whose previous evolution is engraved in their interiors. Those

Probing the interior physics of stars through asteroseismology

Years-long high-precision brightness measurements obtained with telescopes operating in space have become available for thousands of stars. Such data allowed us to measure the physics of stellar

The pulsational properties of ultra-massive DB white dwarfs with carbon-oxygen cores coming from single-star evolution

Context. Ultra-massive white dwarfs are relevant for many reasons: their role as type Ia supernova progenitors, the occurrence of physical processes in the asymptotic giant branch phase, the

The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties

Context. The existence of ultra-massive white dwarf stars, MWD ≳ 1.05 M⊙, has been reported in several studies. These white dwarfs are relevant for the role they play in type Ia supernova explosions,

White Dwarfs as Physics Laboratories: Lights and Shadows

The evolution of white dwarfs is essentially a gravothermal process of cooling in which the basic ingredients for predicting their evolution are well identified, although not always well understood.



Evolutionary and pulsational properties of white dwarf stars

White dwarf stars are the final evolutionary stage of the vast majority of stars, including our Sun. Since the coolest white dwarfs are very old objects, the present population of white dwarfs

The Potential of White Dwarf Cosmochronology

In the light of recent significant progress on both the observational and theoretical fronts, we review the status of white dwarf stars as cosmochronometers. These objects represent the end products

Pulsating white dwarf stars and asteroseismology

At present, a large number of pulsating white dwarf (WD) stars is being discovered either from Earth-based surveys such as the Sloan Digital Sky Survey, or through observations from space (e.g., the

Constraints on white dwarfs structure and evolution from asteroseismology

In the last two decades, considerable efforts have been devoted to the study of white dwarfs pulsators. Owing to ground-based multi-sites observational campaigns, and more recently to the long

A large oxygen-dominated core from the seismic cartography of a pulsating white dwarf

A measurement of the radial chemical stratification in the hydrogen-deficient white-dwarf star KIC08626021 (J192904.6+444708) finds that the oxygen content and extent of its core exceed the predictions of existing models of stellar evolution.

The frequency of planetary debris around young white dwarfs

Context. Heavy metals in the atmospheres of white dwarfs are thought in many cases to be accreted from a circumstellar debris disk, which was formed by the tidal disruption of a rocky planetary body

The evolution of white dwarfs resulting from helium-enhanced, low-metallicity progenitor stars

Context. Some globular clusters host multiple stellar populations with different chemical abundance patterns. This is particularly true for ? Centauri, which shows clear evidence of a helium-enriched

Pulsating White Dwarf Stars and Precision Asteroseismology

Galactic history is written in the white dwarf stars. Their surface properties hint at interiors composed of matter under extreme conditions. In the forty years since their discovery, pulsating white

The Pulsating White Dwarf Stars

We present a summary of what is currently known about the three distinct families of isolated pulsating white dwarfs. These are the GW Vir stars (He/C/O-atmosphere stars with Teff ≃ 120,000 K), the