Results 61 to 70 of about 112,298 (365)
Pulsations in white dwarf stars [PDF]
Proceedings of the International Astronomical Union, 2013 AbstractWe first present a brief description of the six distinct families of pulsating white dwarfs that are now known. These are all opacity-driven pulsators showing low- to mid-order, low-degree gravity modes. We then discuss some recent highlights that have come up in the field of white dwarf asteroseismology.
Gilles Fontaine +7 more
openaire +2 more sources
On the angular momentum evolution of merged white dwarfs [PDF]
, 2006 We study the angular momentum evolution of binaries containing two white dwarfs which merge and become cool helium-rich supergiants. Our object is to compare predicted rotation velocities with observations of highly evolved stars believed to have formed ...
Benz +32 more
core +2 more sources
A Search for Jovian Planets around Hot White Dwarfs [PDF]
, 2000 Current searches for extrasolar planets have concentrated on observing the reflex Doppler shift of solar-type stars. Little is known, however, about planetary systems around non-solar-type stars.
Bryan C. Dunne +5 more
core +2 more sources
White Dwarf Stars as Polytropic Gas Spheres [PDF]
, 2014 We expect that relativistic effects play an important role in compact stars because their electrons are highly degenerate. In this paper, we study the properties of condensed matter in white dwarfs using Newtonian and relativistic polytropic fluid ...
M. Nouh +5 more
semanticscholar +1 more source
New Pulsating DB White Dwarf Stars from the Sloan Digital Sky Survey
, 2008 We are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey.
A. Nitta +32 more
core +1 more source
Rotation in sdB stars as revealed by stellar oscillations
Open Astronomy, 2018 An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane +5 more
doaj +1 more source
Odessa Astronomical Publications, 2017 We shortly present intermidiate results of a survey for weak magnetic fields among degenerate stars (white dwarfs and hot subdwarf stars). Kilogauss upper limits of longitudinal magnetic fields are presented for several brightest DA white dwarfs and new ...
G. Valyavin +6 more
doaj +1 more source
The White Dwarf Binary Pathways Survey I: A sample of FGK stars with white dwarf companions [PDF]
, 2016 The number of spatially unresolved white dwarf plus main-sequence star binaries has increased rapidly in the last decade, jumping from only ∼30 in 2003 to over 3000. However, in the majority of known systems the companion to the white dwarf is a low-mass
S. Parsons +5 more
semanticscholar +1 more source
Diffusion in helium white dwarf stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2000 This paper is aimed at exploring the effects of diffusion on the structure and evolution of low-mass helium white dwarfs. To this end, we solve the multicomponent flow equations describing gravitational settling and chemical and thermal diffusion. The diffusion calculations are coupled to an evolutionary code in order to follow the cooling of low-mass,
Althaus, Leandro Gabriel +1 more
openaire +3 more sources
New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12 [PDF]
, 2015 White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population.
S. O. Kepler +9 more
semanticscholar +1 more source