White Dwarfs
Pulsating white dwarfs
... Each single period is determined by the integral of the pulsation kernel (or work function) over the whole star. It cannot distinguish among different distributions, as demonstrated for example by [79]. If different modes ...
9
Outbursts in two new cool pulsating DA white dwarfs
... these white dwarfs very near to the empirical cool edge of the DAV instability strip — the boundary below which pulsations have not been detected in white ...
12
The onset of convective coupling and freezing in the white dwarfs of 47 Tucanae
... the white dwarfs as a function of ...the white dwarf of 8.6 Gyr, so the white dwarfs start to freeze about 10 Gyr after the birth of the progenitor star, approximately the age of the ...
7
Orbital periods and component masses of three double white dwarfs
... double white dwarf spec- tra are the combined fluxes of two white dwarfs, hence the fitted paramater values are not representative of either white dwarf com- ...
8
3D model atmospheres for extremely low mass white dwarfs
... Convection becomes important in hydrogen-atmosphere ( DA ) white dwarfs ( WDs ) below about 15,000 K. Spectro- scopic analyses of large samples of WDs with 1D model atmospheres show the so-called “ high log ...
11
Spectroscopic analysis of DA white dwarfs with 3D model atmospheres
... DA white dwarfs, we have cho- sen to review the properties of two well studied samples, that of the White Dwarf Catalog (McCook & Sion 1999) and the Sloan Digital Sky Survey (York et ...the ...
28
White Dwarfs are Small, Fast-Spinning Hot Stars
... the white dwarfs within realistic values as small, fast- rotating stars with the density, which is similar to other, both medium and large, hot ...(white dwarfs, pulsars, neutron stars, ...
9
Tidal circularization of gaseous planets orbiting white dwarfs
... a white dwarf will experience orbital shrinkage and circularization due to star-planet ...known white dwarf cooling age, can place coupled constraints on the scattering epoch as well as the active tidal ...
15
Cold giant planets evaporated by hot white dwarfs
... young white dwarfs has not been ...the white dwarf left behind by the ...solar white dwarf, resulting in detectable photospheric absorption ...into white dwarfs, observational ...
9
Interpretation and diversity of exoplanetary material orbiting white dwarfs
... for white dwarf atmospheres is also re- quired, and the diffusion processes operating therein are an active area of research (Bauer & Bildsten 2018; Cunningham et ...of white dwarfs is presently ...
17
Pure helium 3D model atmospheres of white dwarfs
... DB white dwarfs, it would be computationally expensive to create a full grid of 3D model ...(ELM) white dwarfs, it has been shown that ...
18
The Gaia DR1 mass–radius relation for white dwarfs
... These white dwarfs had no parallax measurements until now and were not known to be double ...DA white dwarfs can almost perfectly mimic a single DA in spectroscopic and photometric ...
14
A Gaia Data Release 2 catalogue of white dwarfs and a comparison with SDSS
... of white dwarf candi- ...separate white dwarfs and contaminants by visual ...confirmed white dwarfs and contaminants can be used to test the effect that any additional quality filtering ...
24
A search for white dwarfs in the Galactic plane : the field and the open cluster population
... the white dwarfs and to measure their atmospheric parameters, but higher quality data are necessary if more accurate spectroscopic parallaxes are to be ...cluster white dwarfs and measuring ...
18
Convective overshoot and macroscopic diffusion in pure hydrogen atmosphere white dwarfs
... polluted white dwarf atmospheres as well as characterisation of circumstellar dust and gas disks for a fraction of those are the main observational properties with which we can constrain evolved planetary ...the ...
22
Core crystallization and pile up in the cooling sequence of evolving white dwarfs
... in white dwarfs and the observations also require the release of gravitational energy from the separation of an initially homogeneous fluid into a stratified solid with 16 O/ 12 C ratio that increases ...
18
Multiband photometry and spectroscopy of an all sky sample of bright white dwarfs
... APASS data release 9 (DR9; Henden et al. 2016) contains ≈ 61 million objects in the 10th–17th magnitude range. The sur- vey uses two pairs of 20-cm twin telescopes: two in the north at Dark Ridge Observatory in New ...
21
Orbital relaxation and excitation of planets tidally interacting with white dwarfs
... the tidal dissipation is taking place in the rocky material. The tidal response of terrestrial mantles is viscoelastic (Maxwell) at sufficiently low frequencies (for the Earth, up to about the Chan- dler frequency). At ...
21
Precise parameters for both white dwarfs in the eclipsing binary CSS 41177
... a white dwarf with a small M-dwarf companion, although they noted that a small faint object could produce a signal sim- ilar to what they ...two white dwarfs and to carry out an initial parameter ...
12
Survivability of radio loud planetary cores orbiting white dwarfs
... the white dwarf comprise planets (Debes & Sigurdsson 2002; Veras et ...solar white dwarf phase (Sackmann et ...in white dwarf photospheres are detectable spectroscopically because these stars are ...
13