Results 41 to 50 of about 1,914,179 (372)
The White Dwarfs within 25 Parsecs of the Sun: Kinematics and Spectroscopic Subtypes [PDF]
, 2014 We present the fractional distribution of spectroscopic subtypes, range and distribution of surface temperatures, and kinematical properties of the white dwarfs within 25pc of the sun.
Holberg, J. B. +5 more
core +3 more sources
The evolution of ultra-massive white dwarfs [PDF]
Astronomy & Astrophysics, 2018 Ultra-massive white dwarfs are powerful tools used to study various physical processes in the asymptotic giant branch (AGB), type Ia supernova explosions, and the theory of crystallization through white dwarf asteroseismology.
M. Camisassa +8 more
semanticscholar +1 more source
Simulation of the white dwarf–white dwarf galactic background in the LISA data [PDF]
Classical and Quantum Gravity, 2005 14 pages and 6 figures. Submitted to Classical and Quantum Gravity (Proceedings of GWDAW9)
Edlund, J. +3 more
openaire +6 more sources
The Influence of Tidal Heating on the Habitability of Planets Orbiting White Dwarfs
The Astrophysical Journal Letters, 2023 In recent years, there have been a growing number of observations indicating the presence of rocky material in short-period orbits around white dwarfs. In this Letter, we revisit the prospects for habitability around these post-main-sequence star systems.
Juliette Becker +3 more
doaj +1 more source
Cool DZ white dwarfs II: compositions and evolution of old remnant planetary systems [PDF]
, 2018 In a previous study, we analysed the spectra of 230 cool (Teff 1.9 dex, and Fe to Ni ratios similar to the bulk Earth, have accreted by far the most core-like exoplanetesimals discovered to date. With cooling ages in the range 1-8 Gyr, these white dwarfs
M. Hollands, B. Gaensicke, D. Koester
semanticscholar +1 more source
The Astronomical Journal, 2023 Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with Keck/MOSFIRE, Gemini/GNIRS, and Gemini/Flamingos-2 of seven white dwarfs ...
Dylan Owens +9 more
doaj +1 more source
The search for ZZ Ceti stars in the original Kepler mission [PDF]
, 2016 We report the discovery of 42 white dwarfs in the original Kepler mission field, including nine new confirmed pulsating hydrogen-atmosphere white dwarfs (ZZ Ceti stars).
Bell, Keaton J. +13 more
core +3 more sources
Polluted white dwarfs: constraints on the origin and geology of exoplanetary material [PDF]
Monthly notices of the Royal Astronomical Society, 2018 White dwarfs that have accreted rocky planetary bodies provide unique insights regarding the bulk composition of exoplanetary material. The analysis presented here uses observed white dwarf atmospheric abundances to constrain both where in the planetary ...
John H. D. Harrison +2 more
semanticscholar +1 more source
ON THE EVOLUTION OF MAGNETIC WHITE DWARFS [PDF]
The Astrophysical Journal, 2015 We present the first radiation magnetohydrodynamics simulations of the atmosphere of white dwarf stars. We demonstrate that convective energy transfer is seriously impeded by magnetic fields when the plasma-beta parameter, the thermal to magnetic pressure ratio, becomes smaller than unity.
P.-E. Tremblay +7 more
openaire +4 more sources
Near-Infrared Constraints on the Presence of Warm Dust at Metal-Rich, Helium Atmosphere White Dwarfs [PDF]
, 2008 Here, we present near-infrared spectroscopic observations of 15 helium atmosphere, metal-rich white dwarfs obtained at the NASA Infrared Telescope Facility.
Atsuko Nitta +22 more
core +3 more sources