Results 111 to 120 of about 114,517 (388)
The effect of $^{22}$Ne diffusion in the evolution and pulsational properties of white dwarfs with solar metallicity progenitors [PDF]
, 2016 Because of the large neutron excess of $^{22}$Ne, this isotope rapidly sediments in the interior of the white dwarfs. This process releases an additional amount of energy, thus delaying the cooling times of the white dwarf.
a--Berro, Enrique Garcí +7 more
core +5 more sources
Post-merger evolution of carbon-oxygen + helium white dwarf binaries and the origin of R Coronae Borealis and extreme helium stars [PDF]
, 2014 Orbital decay by gravitational-wave radiation will cause some close-binary white dwarfs (WDs) to merge within a Hubble time. The results from previous hydrodynamical WD-merger simulations have been used to guide calculations of the post-merger evolution ...
Xianfei Zhang +3 more
semanticscholar +1 more source
Asia-Pacific Journal of Chemical Engineering, EarlyView.ABSTRACT This study presents a comparative evaluation of phosphate adsorption on pristine ZIF‐8 and Fe3O4‐doped ZIF‐8 (Fe3O4/ZIF‐8), a hybrid adsorbent combining high surface area with magnetic separability. Structural integrity and composition were confirmed using SEM, XRD, FTIR, and XPS.
Edward Hartman Ernest +10 more
wiley +1 more source
Search for white dwarf companions of cool stars with peculiar element abundances [PDF]
A search for a white dwarf companions of cool stars with peculiar element abundances was undertaken. One additional star the xi Cet, was found with a white dwarf companion.
Boehm-Vitense, E.
core +1 more source
Spitzer White Dwarf Planet Limits [PDF]
, 2006 We present preliminary limits on the presence of planets around white dwarf stars using the IRAC photometer on the Spitzer space telescope. Planets emit strongly in the mid-infrared which allows their presence to be detected as an excess at these ...
Mullally, F. +2 more
core +2 more sources
Helium-rich EHB Stars in Globular Clusters
, 2003 Recent UV observations of the most massive Galactic globular clusters show a significant population of hot stars below the zero-age HB (``blue hook'' stars), which cannot be explained by canonical stellar evolution.
Dreizler, S. +3 more
core +1 more source
Constraining the neutrino magnetic dipole moment from white dwarf pulsations [PDF]
, 2014 Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for ...
Althaus, Leandro G. +4 more
core +4 more sources
Constitution of the White Dwarf Stars [PDF]
Nature, 1931 IT is generally held that the white dwarf is in the degenerate state in the sense of the statistics of Fermi and Dirac. This assumption leads to another consequence bearing on the relative abundance of elements in the same star. Assuming further that (i) all atoms of various elements in the white dwarf are stripped of their extranuclear electrons, and (
openaire +2 more sources
The Anatomical Record, EarlyView.Abstract A subadult Moschognathus whaitsi from the Eastern Cape Province, South Africa, was scanned using synchrotron radiation X‐ray computed tomography (SRXCT). Its subadult state allowed the cranial bones and teeth to be identified and individually reconstructed in 3D.
Tristen Lafferty +3 more
wiley +1 more source
Anatomical Sciences Education, EarlyView.Abstract Entertainment is deeply rooted in education, from wise‐cracking teachers to health documentaries. In the context of anatomy, this already complex relationship is entwined with deeply significant ethical considerations, often related to the field's reliance on human tissue, yet it remains unexplored.
Lucas D. Wilmshurst +4 more
wiley +1 more source