Results 51 to 60 of about 1,877,533 (362)
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
The White Dwarf Companions of 56 Per and HR 3643 [PDF]
To be published in PASP (March 1996), 1995 We have obtained low-dispersion IUE spectra of the stars 56 Persei (F4 V) and HR 3643 (F7 II), as part of a survey of late-type stars with a 1565 A flux excess in the TD-1 ultraviolet sky survey. The IUE spectrum of each star reveals the presence of a hot white dwarf companion.
arxiv +1 more source
A Systematic Study of the Connection Between White Dwarf Period Spectra and Model Structure
The Astrophysical Journal, 2023 To date, pulsational variability has been measured for nearly 70 pulsating helium-atmosphere white dwarfs (DBVs) and 500 pulsating hydrogen-atmosphere white dwarfs (DAVs), with only a fraction of these having been the subject of asteroseismic analysis ...
Agnès Bischoff-Kim
doaj +1 more source
The Temperatures of White Dwarfs in Dwarf Novae [PDF]
International Astronomical Union Colloquium, 1996 AbstractWe attempt to measure the temperature of all the quiescent dwarf novae that have been observed with IUE, by fitting the observed flux distribution of white dwarfs (WDs) with known temperatures. This approach gives results similar to those using much more sophisticated modelling, but allows us to investigate the relationship with system ...
C. La Dous, B. J. M. Hassall
openaire +2 more sources
Fundamental parameter accuracy of DA and DB white dwarfs inGaiaData Release 2 [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We report on a comparison of spectroscopic analyses for hydrogen (DA) and helium atmosphere (DB) white dwarfs with Gaia Data Release 2 (DR2) parallaxes and photometry.
P. Tremblay +4 more
semanticscholar +1 more source
, 2022 48 pages, 6 figures, Invited (and accepted) chapter for the Handbook of X-ray and Gamma-ray Astrophysics, Editors: Cosimo Bambi, Andrea ...
openaire +2 more sources
EPJ Web of Conferences, 2013 The recognition that planets may survive the late stages of stellar evolution, and the prospects for finding them around White Dwarfs, are growing. We discuss two aspects governing planetary survival through stellar evolution to the White Dwarf stage. First we discuss the case of a single planet, and its survival under the effects of stellar mass loss,
Dimitri Veras +4 more
openaire +3 more sources
Hot white dwarfs and pre-white dwarfs discovered with SALT
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT The Southern African Large Telescope survey of helium-rich hot subdwarfs aims to explore evolutionary pathways among groups of highly evolved stars. The selection criteria mean that several hot white dwarfs and related objects have also been included.
C S Jeffery +5 more
openaire +4 more sources
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
Cold Giant Planets Evaporated by Hot White Dwarfs [PDF]
Astrophysical Journal, 2019 Atmospheric escape from close-in Neptunes and hot Jupiters around Sun-like stars driven by extreme ultraviolet (EUV) irradiation plays an important role in the evolution of exoplanets and in shaping their ensemble properties.
M. Schreiber +4 more
semanticscholar +1 more source