Results 31 to 40 of about 1,914,179 (372)
The contribution of Oxygen-Neon white dwarfs to the MACHO content of the Galactic Halo [PDF]
, 2007 The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. White dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However,
Adams +45 more
core +4 more sources
DETECTION OF A WHITE DWARF COMPANION TO THE WHITE DWARF SDSSJ125733.63+542850.5 [PDF]
The Astrophysical Journal, 2011 SDSSJ125733.63+542850.5 (hereafter SDSSJ1257+5428) is a compact white dwarf binary from the Sloan Digital Sky Survey that exhibits high-amplitude radial velocity variations on a period of 4.56 hours. While an initial analysis suggested the presence of a neutron star or black-hole binary companion, a follow-up study concluded that the spectrum was ...
L. Merry +6 more
openaire +4 more sources
Low Luminosity Companions to White Dwarfs [PDF]
, 2005 This paper presents results of a near-infrared imaging survey for low mass stellar and substellar companions to white dwarfs. A wide field proper motion survey of 261 white dwarfs was capable of directly detecting companions at orbital separations ...
Alexander J. +20 more
core +4 more sources
Supernovae sparked by dark matter in white dwarfs [PDF]
Physical Review D, 2019 It was recently demonstrated that asymmetric dark matter can ignite supernovae by collecting and collapsing inside lone sub-Chandrasekhar mass white dwarfs, and that this may be the cause of Type Ia supernovae.
Javier F. Acevedo, J. Bramante
semanticscholar +1 more source
Universe, 2023 In 1995, Glendenning, Kettner and Weber postulated the existence of a new class of compact stars resembling white dwarfs but containing a small strange quark-matter core surrounded by hadronic layers attaining much higher densities than those found in ...
Loïc Perot, Nicolas Chamel
doaj +1 more source
Isochrones and Luminosity Functions for Old White Dwarfs [PDF]
, 1999 Using a new grid of models of cooling white dwarfs, we calculate isochrones and luminosity functions in the Johnson-Kron/Cousins and HST filter sets for systems containing old white dwarfs.
Alessandro Chieffi +9 more
core +2 more sources
A New Generation of Cool White Dwarf Atmosphere Models. IV. Revisiting the Spectral Evolution of Cool White Dwarfs [PDF]
Astrophysical Journal, 2019 As a result of competing physical mechanisms, the atmospheric composition of white dwarfs changes throughout their evolution, a process known as spectral evolution.
S. Blouin +3 more
semanticscholar +1 more source
International Astronomical Union Colloquium, 1994 It is the intention of this review to explain what white dwarfs are and why it is interesting to study them, and why the H+2molecule is of special interest.The evolution, from start to finish, of a star of mass less than about 2 solar masses (M⊙), can roughly be summarized as follows:–A cloud of gas contracts from the interstellar medium until hydrogen
openaire +1 more source
The unbiased frequency of planetary signatures around single and binary white dwarfs using Spitzer and Hubble [PDF]
Monthly notices of the Royal Astronomical Society, 2019 This paper presents combined Spitzer IRAC and Hubble COS results for a double-blind survey of 195 single and 22 wide binary white dwarfs for infrared excesses and atmospheric metals. The selection criteria include cooling ages in the range 9 to 300 Myr,
T. Wilson +3 more
semanticscholar +1 more source
International Journal of Modern Physics: Conference Series, 2017 White dwarf stars are the final stage of most stars, born single or in multiple systems. We discuss the identification, magnetic fields, and mass distribution for white dwarfs detected from spectra obtained by the Sloan Digital Sky Survey up to Data Release 13 in 2016, which lead to the increase in the number of spectroscopically identified white ...
Gustavo Ourique +3 more
openaire +3 more sources