Results 151 to 160 of about 1,989,293 (378)

AR Sco as a possible seed of highly magnetised white dwarf

, 2017
We explore the possibility that the recently discovered white dwarf pulsar AR Sco acquired its high spin and magnetic field due to repeated episodes of accretion and spin-down. An accreting white dwarf can lead to a larger mass and consequently a smaller
Bhatia, Tanayveer Singh, Mukhopadhyay, Banibrata, Rao, A. R.   +2 more
core   +1 more source

From Young and Hot to Old and Cold: Comparing White Dwarf Cooling Theory to Main Sequence Stellar Evolution in Open Clusters [PDF]

, 2005
I explore the current ability of both white dwarf cooling theory and main sequence stellar evolution theory to accurately determine stellar population ages by comparing ages derived using both techniques for open clusters ranging from 0.1 to 4 Gyr.
Baraffe I., Carraro G., Lee S. H., Marconi G., Mermilliod J.-C., Perryman M. A. C., Siess L., Ted von Hippel, von Hippel T., Weidemann V.   +9 more
core   +3 more sources

Numerical Simulations of Gaseous Disks Generated from Collisional Cascades at the Roche Limits of White Dwarf Stars [PDF]

, 2017
We consider the long-term evolution of gaseous disks fed by the vaporization of small particles produced in a collisional cascade inside the Roche limit of a 0.6 white dwarf. Adding solids with radius at a constant rate into a narrow annulus leads to two
S. Kenyon, B. Bromley
semanticscholar   +1 more source

Biodiversity Credits: An Overview of the Current State, Future Opportunities, and Potential Pitfalls

Business Strategy and the Environment, EarlyView.
ABSTRACT Biodiversity credits are an emerging vehicle for pro‐environmental financing, yet much uncertainty remains around how and when they could boost biodiversity conservation. Here we define what biodiversity credits are and explore impact pathways through a proposed theory of change. Based on evidence from 34 pilot projects and a review of lessons
Sven Wunder, Cecilia Fraccaroli, Joseph W. Bull, Trishna Dutta, Alison Eyres, Megan C. Evans, Bo Jellesmark Thorsen, Julia P. G. Jones, Martine Maron, Bart Muys, Andrea Pacheco, Asger Strange Olesen, Thomas Swinfield, Yitagesu Tekle Tegegne, Thomas B. White, Han Zhang, Sophus O. S. E. zu Ermgassen   +16 more
wiley   +1 more source

Photometric White Dwarf Rotation

The Astrophysical Journal
We present a census of photometrically detected rotation periods for white dwarf (WD) stars. We analyzed the light curves of 9285 WD stars observed by the Transiting Exoplanet Survey Satellite up to Sector 69.
Gabriela Oliveira da Rosa, S. O. Kepler, L. T. T. Soethe, Alejandra D. Romero, Keaton J. Bell   +4 more
doaj   +1 more source

A Tidally-Disrupted Asteroid Around the White Dwarf G29-38 [PDF]

, 2003
The infrared excess around the white dwarf G29-38 can be explained by emission from an opaque flat ring of dust with an inner radius 0.14 of the radius of the Sun and an outer radius approximately equal to the Sun's.
Koester D., M. Jura, Michalak G., Nicholson P., Ossenkopf V., Vauclair G.   +5 more
core   +3 more sources

Astrophysics of white dwarf binaries [PDF]

AIP Conference Proceedings, 2006
White dwarf binaries are the most common compact binaries in the Universe and are especially important for low-frequency gravitational wave detectors such as LISA. There are a number of open questions about binary evolution and the Galactic population of white dwarf binaries that can be solved using gravitational wave data and at the same time, our ...
openaire   +5 more sources

From Waste to Watts: Cigarette Filter Waste to Carbon Nanomaterial‐Based Supercapacitors for Sustainable Energy Storage Applications

Battery Energy, EarlyView.
We present an economically viable approach for synthesizing carbon nanomaterials derived from discarded cigarette filters, an abundant environmental pollutant. The resulting material exhibits desirable characteristics, including a well‐defined stacking structure, high porosity, and a substantial specific surface area, making it suitable as an active ...
Akash Sivanandan, Mayank Pathak, Sharmila Saminathan, Sravendra Rana, Nanda Gopal Sahoo, C. V. Ramana   +5 more
wiley   +1 more source

The White Dwarf in EM Cygni: Beyond The Veil

, 2009
We present a spectral analysis of the FUSE spectra of EM Cygni, a Z Cam DN system. The FUSE spectrum, obtained in quiescence, consists of 4 individual exposures (orbits): two exposures, at orbital phases phi ~ 0.65 and phi ~ 0.90, have a lower flux; and ...
Agafonov, Albert P. Linnell, Bailey, Beuermann, Blondin, Bruch, Cannizzo, Edward M. Sion, Godon, Hack, Hamilton, Harrison, Jameson, Kraft, La Dous, Marsh, Morton, Morton, Nevo, Patrick Godon, Paul E. Barrett, Press, Pringle, Sion, Spogli, Spogli, Urban, Verbunt, Wade, Warner, Welsh, Welsh, Winter   +32 more
core   +1 more source

White-dwarf asteroseismology: An update [PDF]

Proceedings of the International Astronomical Union, 2019
AbstractThe vast majority of stars that populate the Universe will end their evolution as white-dwarf stars. Applications of white dwarfs include cosmochronology, evolution of planetary systems, and also as laboratories to study non-standard physics and crystallization. In addition to the knowledge of their surface properties from spectroscopy combined
openaire   +4 more sources