Results 31 to 40 of about 154,154 (200)
Rapidly rotating white dwarfs [PDF]
Nonlinearity, 2020 A rotating star may be modeled as a continuous system of particles attracted to each other by gravity and with a given total mass and prescribed angular velocity. Mathematically this leads to the Euler-Poisson system. A white dwarf star is modeled by a very particular, and rather delicate, equation of state for the pressure as a function of the density.
Strauss, Walter A., Wu, Yilun
openaire +2 more sources
Contribution of brown dwarfs and white dwarfs to recent microlensing observations and to the halo mass budget [PDF]
, 1996 We examine the recent results of the MACHO collaboration towards the Large Magellanic Cloud (Alcock et al. 1996) in terms of a halo brown dwarf or white dwarf population.
D. Méra +7 more
core +2 more sources
A wide binary trigger for white dwarf pollution
, 2015 Metal pollution in white dwarf atmospheres is likely to be a signature of remnant planetary systems. Most explanations for this pollution predict a sharp decrease in the number of polluted systems with white dwarf cooling age. Observations do not confirm
Bonsor, Amy, Veras, Dimitri
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White-Dwarf Asteroseismology With the Kepler Space Telescope
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 possible to shed light on their deep inner structure ...
Alejandro H. Córsico +1 more
doaj +1 more source
Gaseous Material Orbiting the Polluted, Dusty White Dwarf HE1349-2305 [PDF]
, 2012 We present new spectroscopic observations of the polluted, dusty, helium-dominated atmosphere white dwarf star HE1349-2305. Optical spectroscopy reveals weak CaII infrared triplet emission indicating that metallic gas debris orbits and is accreted by the
Bessel +26 more
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Double White Dwarf Merger Products among High-mass White Dwarfs [PDF]
The Astrophysical Journal, 2020 Abstract Double white dwarf (double-WD) binaries may merge within a Hubble time and produce high-mass WDs. Compared to other high-mass WDs, the double-WD merger products have higher velocity dispersion because they are older. With the power of Gaia data, we show strong evidence for double-WD merger products among high-mass WDs by ...
Sihao 浩 Cheng 程思 +3 more
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A Tidally-Disrupted Asteroid Around the White Dwarf G29-38 [PDF]
, 2003 The infrared excess around the white dwarf G29-38 can be explained by emission from an opaque flat ring of dust with an inner radius 0.14 of the radius of the Sun and an outer radius approximately equal to the Sun's.
Koester D. +5 more
core +3 more sources
Eclipsing binary and white dwarf features associated with K2 target EPIC251248385 [PDF]
, 2019 White dwarfs, remnants of Sun-like stars which have completed their evolution, are one of the most common types of stars in space. Despite this, very few white dwarfs have been observed in transiting or eclipsing systems, and only two planetary systems ...
Armstrong, James D. +5 more
core +1 more source
White Dwarfs in Wide Binaries: The Strong Effects of Stellar Evolution and Mass Loss
The Astrophysical JournalWe examine the statistics of main-sequence/main-sequence, main-sequence/white-dwarf, and white-dwarf/white-dwarf wide binaries at 10 ^2.5 –10 ^4 au separations in Gaia data.
Hsiang-Chih Hwang, Nadia L. Zakamska
doaj +1 more source
Cooling Process of White Dwarf Stars in Palatini f(R) Gravity
Universe, 2022 A simple cooling model of white dwarf stars is re-analyzed in Palatini f(R) gravity. Modified gravity affects the white dwarf structures and consequently their ages.
Surajit Kalita +2 more
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