Results 51 to 60 of about 72,602 (336)
Advanced Functional Materials, EarlyView.Free‐standing plasmonic gold‐based fractal antennas are fabricated by 3D nanoprinting, employing focused electron beam induced deposition and an optimized purification method to remove carbon while conserving structural fidelity. Simulation and experiment show broadband plasmonic activity, including customizable polarizability, thereby paving the way ...
Verena Reisecker +6 more
wiley +1 more source
A Superwind from Early Post-Red Giant Stars? [PDF]
, 2001 We suggest that the gap observed at 20,000 K in the horizontal branches of several Galactic globular clusters is caused by a small amount of extra mass loss which occurs when stars start to "peel off" the red giant branch (RGB), i.e., when their ...
Amos Harpaz +5 more
core +3 more sources
Chemical separation in horizontal-branch stars
The Astrophysical Journal, 1983 Abundance anomalies are predicted to be produced by diffusion processes in horizontal-branch (HB) and halo Population II stars. If the outer envelope is stable enough for the gravitational settling of He to be efficient, it is here shown that overabundances of heavy elements are simultaneously produced. Abundance anomalies as large as 10/sup 3/--10/sup
G. Michaud, G. Vauclair, S. Vauclair
openaire +1 more source
Advanced Functional Materials, EarlyView.An advanced F‐doped and ─CN group co‐modified FCCN is developed. Due to the synergistic effects of co‐modification in promoting photogenerated exciton generation, enhancing charge kinetics, expanding active interfacial areas, and optimizing CO2 interfacial reactions, the FCCN photocatalyst demonstrates excellent catalytic performance and high ...
Sheng‐Qi Guo +9 more
wiley +1 more source
On the red giant branch mass loss in 47 Tucanae: Constraints from the horizontal branch morphology [PDF]
, 2016 We obtain stringent constraints on the actual efficiency of mass loss for red giant branch stars in the Galactic globular cluster 47 Tuc, by comparing synthetic modeling based on stellar evolution tracks with the observed distribution of stars along the ...
Cassisi, S, Pietrinferni, A, Salaris, M
core +2 more sources
The Red Horizontal-Branch Star HD 17072 [PDF]
The Astronomical Journal, 1998 We summarize the results of a spectroscopic analysis of HD 17072, finding it to be a metal-poor ([Fe/H] = -1.17) red horizontal-branch star with Teff = 5375 K and log g = 2.4. We also derive a radial velocity of 62.8 km s-1. It has the best determined Hipparcos trigonometric parallax among the metal-poor field horizontal-branch stars and supports the ...
Lee, Jae-Woo +2 more
openaire +1 more source
Precursor Mineral Phases of Forming Mollusk Shell Nacre: A Study of Hydrated Samples
Advanced Functional Materials, EarlyView.Mineral, organic phase, and water are the essential components in mollusk shell nacre formation. Their interplay is not well understood, because the hydrated material is difficult to observe at high resolution, under close to native conditions. Forming nacre is studied using environmental and cryo‐electron microscopy and hydrated ACC phases, together ...
Anna Kozell +4 more
wiley +1 more source
Spectroscopic and Photometric Analysis of the HW Vir Star PTF1 J011339.09+225739.1
Open Astronomy, 2018 HW Vir systems are rare eclipsing binary systems including a subdwarf B star (sdB) with a faint companion, mostly M-dwarfs. Up to now, 19 HW Vir systems have been published, three of them with substellar companions. We report the spectroscopic as well as
Wolz Maximilian +9 more
doaj +1 more source
The Origin of Extreme Horizontal Branch Stars [PDF]
The Astrophysical Journal, 1996 Strong mass loss on the red giant branch (RGB) can result in the formation of extreme horizontal branch (EHB) stars. The EHB stars spend most of their He core and shell burning phase at high temperatures and produce copious ultraviolet flux. They have very small hydrogen envelopes and occupy a small range in mass.
d'Cruz, Noella Lambert +3 more
openaire +2 more sources
Advanced Functional Materials, EarlyView.The study proposes a 1‐bit programmable metasurface based on flip‐disc display, named flip‐disc metasurface (FD‐MTS). This new design enables ultralow energy consumption while maintaining coding patterns. It also exhibits high scalability and multifunctional flexibility.
Jiang Han Bao +8 more
wiley +1 more source