Lithium production in the merging of white dwarf stars [PDF]
, 2012 The origin of R Coronae Borealis stars has been elusive for over 200 years. Currently, two theories for their formation have been presented. These are the Final Flash scenario, in which a dying asymptotic giant branch (AGB) star throws o its atmosphere ...
R. Longland +4 more
openalex +3 more sources
New full evolutionary sequences of H- and He-atmosphere massive white dwarf stars using mesa [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We explore the evolution of hydrogen-rich and hydrogen-deficient white dwarf stars with masses between 1.012 and 1.307 Msun, and initial metallicity of Z=0.02.
G. R. Lauffer, A. Romero, S. O. Kepler
semanticscholar +1 more source
Relativistic Tidal Disruption and Nuclear Ignition of White Dwarf Stars by Intermediate-mass Black Holes [PDF]
Astrophysical Journal, 2018 We present results from general relativistic calculations of the tidal disruption of white dwarf stars from near encounters with intermediate-mass black holes. We follow the evolution of 0.2 M⊙ and 0.6 M⊙ stars on parabolic trajectories that approach 103–
P. Anninos +7 more
semanticscholar +1 more source
Pulsation properties of ultra-massive DA white dwarf stars with ONe cores [PDF]
Astronomy & Astrophysics, 2018 Context. Ultra-massive hydrogen-rich white dwarf stars are expected to harbor oxygen/neon cores resulting from the progenitor evolution through the super-asymptotic giant branch phase.
F. D. Ger'onimo +4 more
semanticscholar +1 more source
Population Synthesis of Helium White Dwarf–Red Giant Star Mergers and the Formation of Lithium-rich Giants and Carbon Stars [PDF]
Astrophysical Journal, 2020 The formation histories of lithium-rich and carbon-rich red giants are not yet understood. It has been proposed that the merger of a helium-core white dwarf with a red giant branch (RGB) star might provide a solution. We have computed an extended grid of
Xianfei Zhang +3 more
semanticscholar +1 more source
JWST Directly Images Giant Planet Candidates Around Two Metal-polluted White Dwarf Stars [PDF]
Astrophysical Journal LettersWe report the discovery of two directly imaged, giant planet candidates orbiting the metal-rich, hydrogen atmosphere white dwarfs WD 1202−232 and WD 2105−82. JWST’s Mid-Infrared Instrument (MIRI) data on these two stars show a nearby resolved source at a
S. Mullally +11 more
semanticscholar +1 more source
Asteroseismological study of massive ZZ Ceti stars with fully evolutionary models [PDF]
, 2013 We present the first asteroseismological study for 42 massive ZZ Ceti stars based on a large set of fully evolutionary carbon$-$oxygen core DA white dwarf models characterized by a detailed and consistent chemical inner profile for the core and the ...
Althaus, L. G. +4 more
core +4 more sources
Deposition of steeply infalling debris around white dwarf stars [PDF]
, 2017 High-metallicity pollution is common in white dwarf (WD) stars hosting remnant planetary systems. However, they rarely have detectable debris accretion discs, possibly because much of the influx is fast steeply-infalling debris in star-grazing orbits ...
JOHN C. Brown, D. Veras, B. Gaensicke
semanticscholar +1 more source
Detached white-dwarf close-binary stars -- CV's extended family [PDF]
, 1999 I review detached binaries consisting of white dwarfs with either other white dwarfs or low mass main-sequence stars in tight orbits around them. Orbital periods have been measured for 15 white dwarf/white dwarf systems and 22 white dwarf/M dwarf systems.
Marsh, T. R.
core +3 more sources
Numerical Simulations of Collisional Cascades at the Roche Limits of White Dwarf Stars [PDF]
, 2017 We consider the long-term collisional and dynamical evolution of solid material orbiting in a narrow annulus near the Roche limit of a white dwarf.
S. Kenyon, B. Bromley
semanticscholar +1 more source