Results 41 to 50 of about 69,486 (315)
White-Dwarf Asteroseismology With the Kepler Space Telescope
Frontiers in Astronomy and Space Sciences, 2020 In the course of their evolution, white-dwarf stars go through at least one phase of variability in which the global pulsations they undergo allow astronomers to peer into their interiors, making it possible to shed light on their deep inner structure ...
Alejandro H. Córsico +1 more
doaj +1 more source
Spectroscopic Identification of Cool White Dwarfs in the Solar Neighbourhood [PDF]
Astrophys.J. 643 (2006) 402-415, 2006 The New Luyten Two-Tenths catalog contains a large number of high-proper motion white dwarf candidates that remain to be spectroscopically confirmed. We present new spectroscopic observations as well as SDSS archival spectra of 49 white dwarf candidates which have been selected from the revised NLTT catalog of Salim & Gould 2003.
arxiv +1 more source
Symposium - International Astronomical Union, 1974 The effects of core crystallization and of convection in the envelope on the cooling of white dwarfs are reviewed. The case of a 0.6 M⊙ white dwarf composed of an oxygen core and a helium envelope is taken as example. Also the amount of hydrogen that a white dwarf can accrete before nuclear burning occurs is estimated and possible evolutionary ...
openaire +1 more source
JGH Open, Volume 7, Issue 1, Page 16-23, January 2023., 2023 Endoscopic CBD stone removal is more difficult with stones larger than 2 mm than with distal CBD diameter or round or square‐shaped stones. Therefore, endoscopic large papillary balloon dilatation (ELPBD) is probably more required for stones larger than 2 mm than for distal CBD; likewise, round or square‐shaped stones are likely more required for ELPBD
Chote Wongkanong +4 more
wiley +1 more source
Cubic crystal elastic constants of a white dwarf stellar core determined via modal analysis
AIP Advances, 2021 In this work, we present the cubic crystal elastic constants of a fully crystallized white dwarf stellar core. Elastic constants were calculated utilizing modal analysis of three-dimensional single-layer and stratified multi-layer crystalline core models.
K. A. Pestka II +3 more
doaj +1 more source
Electromagnetic Characterization of the LISA Verification Binary ZTF J0526+5934
The Astrophysical Journal, 2023 We present an analysis of new and archival data to the 20.506 minute LISA verification binary J052610.42+593445.32 (J0526+5934). Our joint spectroscopic and photometric analysis finds that the binary contains an unseen M _1 = 0.89 ± 0.11 M _⊙ CO-core ...
Alekzander Kosakowski +3 more
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2022 In this research, first considering the electron–electron interaction in the high-density Fermi electron gas at T = 0 K, this interaction causes the pressure 2/137 time less than the original value.
Ting-Hang Pei
doaj +1 more source
Near Surface Geophysics, Volume 20, Issue 6, Page 572-589, December 2022., 2022 ABSTRACT The detection of mineral deposits and their related geological structures is of great importance to the mining industry as structures (such as dykes and faults) can affect the safety, cost and efficiency of mining. With the goal of testing cost‐effective seismic methods for mineral exploration and mining, active and passive seismic experiments
Moyagabo K. Rapetsoa +8 more
wiley +1 more source
Testing White Dwarf Age Estimates Using Wide Double White Dwarf Binaries from Gaia EDR3
The Astrophysical Journal, 2022 White dwarf (WD) stars evolve simply and predictably, making them reliable age indicators. However, self-consistent validation of the methods for determining WD total ages has yet to be widely performed.
Tyler M. Heintz +6 more
doaj +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.
arxiv +1 more source