Stark Broadening and White Dwarfs [PDF]
Open Astronomy, 2011 White dwarf and pre-white dwarfs are the best types of stars for the application of Stark broadening research results in astrophysics, since in the atmospheres of these stars physical conditions are very favorable for this line broadening mechanism - in ...
Dimitrijević Milan S. +3 more
doaj +8 more sources
Modelling quantum aspects of disruption of a white dwarf star by a black hole [PDF]
Scientific Reports, 2021 We study the final stages of the evolution of a binary system consisted of a black hole and a white dwarf star. We implement the quantum hydrodynamic equations and carry out numerical simulations.
Tomasz Karpiuk +3 more
doaj +2 more sources
ELOVL5 and VLDLR synergistically affect n-3 PUFA deposition in eggs of different chicken breeds [PDF]
Poultry Science: There was no significant difference in the composition and content of fatty acids in eggs among different breeds initially, but following the supplementation of flaxseed oil, Dwarf Layer were observed to deposit more n-3 polyunsaturated fatty acid ...
Caiyun Jiang +8 more
doaj +2 more sources
A highly magnetized and rapidly rotating white dwarf as small as the Moon [PDF]
Nature, 2021 White dwarfs represent the last stage of evolution of stars with mass less than about eight times that of the Sun and, like other stars, are often found in binaries1,2. If the orbital period of the binary is short enough, energy losses from gravitational-
I. Caiazzo +17 more
semanticscholar +1 more source
A Jovian analogue orbiting a white dwarf star [PDF]
Nature, 2021 Studies1,2 have shown that the remnants of destroyed planets and debris-disk planetesimals can survive the volatile evolution of their host stars into white dwarfs3,4, but few intact planetary bodies around white dwarfs have been detected5–8. Simulations
J. Blackman +15 more
semanticscholar +1 more source
An Isolated White Dwarf with a 70 s Spin Period [PDF]
Astrophysical Journal Letters, 2021 We report the discovery of an isolated white dwarf with a spin period of 70 s. We obtained high-speed photometry of three ultramassive white dwarfs within 100 pc and discovered significant variability in one.
M. Kilic +4 more
semanticscholar +1 more source
22Ne Phase Separation as a Solution to the Ultramassive White Dwarf Cooling Anomaly [PDF]
Astrophysical Journal Letters, 2021 The precise astrometric measurements of the Gaia Data Release 2 have opened the door to detailed tests of the predictions of white dwarf cooling models.
S. Blouin, J. Daligault, D. Saumon
semanticscholar +1 more source
White Dwarf Subsystems in Core-Collapsed Globular Clusters [PDF]
Astrophysical Journal, 2021 Numerical and observational evidence suggests that massive white dwarfs dominate the innermost regions of core-collapsed globular clusters by both number and total mass.
K. Kremer +7 more
semanticscholar +1 more source
The 100 pc White Dwarf Sample in the SDSS Footprint [PDF]
Astrophysical Journal, 2020 We present follow-up spectroscopy of 711 white dwarfs within 100 pc, and we present a detailed model atmosphere analysis of the 100 pc white dwarf sample in the Sloan Digital Sky Survey footprint.
M. Kilic +5 more
semanticscholar +1 more source
On the Spectral Evolution of Hot White Dwarf Stars. I. A Detailed Model Atmosphere Analysis of Hot White Dwarfs from SDSS DR12 [PDF]
Astrophysical Journal, 2020 As they evolve, white dwarfs undergo major changes in surface composition, a phenomenon known as spectral evolution. In particular, some stars enter the cooling sequence with helium atmospheres (type DO) but eventually develop hydrogen atmospheres (type ...
A. Bédard +3 more
semanticscholar +1 more source