Results 101 to 110 of about 2,034,344 (399)

Contribution of brown dwarfs and white dwarfs to recent microlensing observations and to the halo mass budget [PDF]

, 1996
We examine the recent results of the MACHO collaboration towards the Large Magellanic Cloud (Alcock et al. 1996) in terms of a halo brown dwarf or white dwarf population.
D. Méra, G. Chabrier, Garcia-Berro E., L. Segretain, Larson R. B., Segretain L., Stevenson D. J., von Hippel T.   +7 more
core   +2 more sources

The Vegan Villain Sets Out to The End of Summer: Functionalized Coatings as Biohybrid UV‐Sensors

Advanced Materials Interfaces, EarlyView.
This study introduces biohybrid coatings incorporating E. coli biomass expressing photoconvertible fluorescent proteins as UV‐A responsive elements. Upon irradiation at 400 nm, the coatings exhibit an irreversible fluorescence shift from green to red within 15 min. Notably, the photoconversion capability is retained after >1 year of storage.
Amelie Skopp, Matea Marosevic, Broder Rühmann, Volker Sieber   +3 more
wiley   +1 more source

Studying the Radiation of a White Dwarf Star Falling onto a Black Hole

The Astrophysical Journal
We investigate electromagnetic and gravitational radiation generated during the process of the tidal stripping of a white dwarf star circulating a black hole.
Marek Nikołajuk, Tomasz Karpiuk, Lorenzo Ducci, Mirosław Brewczyk   +3 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

Subicular Astrocytes Govern Seizure‐Impaired Fear Memory

Advanced Science, EarlyView.
Astrocytes in dorsal subiculum act as a critical modulator of seizure‐associated cognitive dysfunction, operating through a Ca2+‐dependent adenosine‐linked astrocyte‐neuron signaling pathway that disrupts neuronal circuit homeostasis. This research highlights the potential of astrocyte‐targeted interventions as a therapeutic strategy, moving beyond the
Yuying Shao, Jing Xi, Yuhao Sun, Yulan Li, Zhisheng Li, Wangjialu Lu, Jialu Chen, Lin Yang, Fan Fei, Heming Cheng, Li Cheng, Cenglin Xu, Zhuo Huang, Vladimir Parpura, Yi Wang, Zhong Chen   +15 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, J. J. Hermes, Kareem El-Badry, Charlie Walsh, Jennifer L. van Saders, C. E. Fields, Detlev Koester   +6 more
doaj   +1 more source

Nuclear Mixing Meters for Classical Novae [PDF]

, 2013
Classical novae are caused by mass transfer episodes from a main sequence star onto a white dwarf via Roche lobe overflow. This material forms an accretion disk around the white dwarf.
Champagne, Art, Downen, Lori, Iliadis, Christian, José, Jordi, Kelly, Keegan J.   +4 more
core   +3 more sources

Spatially Resolved Mapping of Voltage‐Gated Proton Channel Activity Reveals Delayed Proton Transport in Local Microenvironments

Advanced Science, EarlyView.
A revolutionary imaging platform integrating quantitative single‐molecule photobleaching with ratiometric fluorescence probes enables high‐throughput (≈2300 individually resolvable channels) mapping of individual proton channels in a large field (≈3000 µm2), overcoming the spatial and temporal limitations of conventional electrophysiology.
Jiahua Zhuang, Yang Xu, Yuxian Lu, Shiyang Lyu, Jie Tan, Jiandong Feng   +5 more
wiley   +1 more source

A Test of Spectroscopic Age Estimates of White Dwarfs Using Wide WD+WD Binaries

The Astrophysical Journal
White dwarf stars have been used for decades as precise and accurate age indicators. This work presents a test of the reliability of white dwarf total ages when spectroscopic observations are available. We conduct follow-up spectroscopy of 148 individual
Tyler M. Heintz, J. J. Hermes, P.-E. Tremblay, Lou Baya Ould Rouis, Joshua S. Reding, B. C. Kaiser, Jennifer L. van Saders   +6 more
doaj   +1 more source

Gaseous Material Orbiting the Polluted, Dusty White Dwarf HE1349-2305 [PDF]

, 2012
We present new spectroscopic observations of the polluted, dusty, helium-dominated atmosphere white dwarf star HE1349-2305. Optical spectroscopy reveals weak CaII infrared triplet emission indicating that metallic gas debris orbits and is accreted by the
Bessel, Brinkworth, Brinkworth, Debes, Dufour, Dufour, Dufour, Dufour, Epchtein, Farihi, Farihi, Farihi, Girven, Gänsicke, Gänsicke, Jura, Jura, Jura, Klein, Klein, Martin, Melis, Melis, Morrissey, Skrutskie, Zuckerman, Zuckerman   +26 more
core   +2 more sources