Results 41 to 50 of about 112,298 (365)
The Astrophysical Journal, 2023 AllS single stars that are born with masses up to 8.5–10 M _⊙ will end their lives as white dwarf (WD) stars. In this evolutionary stage, WDs enter the cooling sequence, where the stars radiate away their thermal energy and are basically cooling.
Weston Hall +2 more
doaj +1 more source
The potential of asteroseismology for probing the core chemical stratification in white dwarf stars [PDF]
, 2016 Context. The details of the C/O core structure in white dwarf stars has mostly remained inaccessible to the technique of asteroseismology, despite several attempts carried out in the past. Aims.
N. Giammichele +4 more
semanticscholar +1 more source
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
HST Spectra of GW Librae: A Hot Pulsating White Dwarf in a Cataclysmic Variable [PDF]
, 2002 We have obtained Hubble Space Telescope UV spectra of the white dwarf in GW Lib, the only known non-radially pulsating white dwarf in a cataclysmic variable, and the first known DAZQ variable. The UV light curve reveals large amplitude (10%) pulsationsin
Boris T. Gänsicke +4 more
core +3 more sources
Barium and related stars, and their white-dwarf companions [PDF]
Astronomy & Astrophysics, 2019 Barium (Ba) dwarfs and CH subgiants are the less evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by their binary companions when the companion was on the asymptotic giant branch (AGB).
A. Escorza +14 more
semanticscholar +1 more source
Searching for benchmark systems containing ultra-cool dwarfs and white dwarfs
EPJ Web of Conferences, 2013 We have used the 2MASS all-sky survey and WISE to look for ultracool dwarfs that are part of multiple systems containing main sequence stars. We cross-matched L dwarf candidates from the surveys with Hipparcos and Gliese stars, finding two new systems ...
Pinfield D.J., Gomes J.I.
doaj +1 more source
Limits on the Halo White Dwarf Component of Baryonic Dark Matter from the {\em Hubble Deep Field} [PDF]
, 1996 The MACHO collaboration lensing event statistics suggest that a significant fraction of the dark galactic halo can be comprised of baryonic matter in the form of white dwarf stars with masses between 0.1 and 1.0 \Msun . Such a halo white dwarf population,
Bennett D. +3 more
core +3 more sources
A New Generation of Cool White Dwarf Atmosphere Models. I. Theoretical Framework and Applications to DZ Stars [PDF]
Astrophysical Journal, 2018 The photospheres of the coolest helium-atmosphere white dwarfs are characterized by fluidlike densities. Under those conditions, standard approximations used in model atmosphere codes are no longer appropriate. Unfortunately, the majority of cool He-rich
S. Blouin, P. Dufour, N. Allard
semanticscholar +1 more source
White Dwarf Central Stars [PDF]
Symposium - International Astronomical Union, 1993 Planetary nebula nuclei on lower luminosity, diagonal tracks in the HR Diagrams are degenerate dwarf stars close to their final radii. For several reasons, these stars have until recently been difficult to identify and study. With the advent of new techniques and technologies, both hydrogen–rich and hydrogen–poor atmospheric sequences have been found.
openaire +2 more sources
The Chromospheric Activity and Ages of M Dwarf Stars in Wide Binary Systems [PDF]
, 2005 We investigate the relationship between age and chromospheric activity for 139 M dwarf stars in wide binary systems with white dwarf companions. The age of each system is determined from the cooling age of its white dwarf component. The current limit for
Abt H. A. +12 more
core +3 more sources