Results 41 to 50 of about 72,602 (336)

Diffusion in hot subdwarf progenitors from the common envelope channel

Open Astronomy, 2017
Diffusion of elements in the atmosphere of a star can drastically affect its surface composition, sometimes leading to unusual mixtures. These chemically peculiar stars can be identified fromthe presence of unusual lines in their spectra.
Byrne Conor M., Jeffery C. Simon, Tout Christopher A., Hu Haili   +3 more
doaj   +1 more source

A spectral atlas of λ Bootis stars [PDF]

Serbian Astronomical Journal, 2014
Since the discovery of λ Bootis stars, a permanent confusion about their classification can be found in literature. This group of non-magnetic, Population I, metal-poor A to F-type stars, has often been used as some sort of trash can for "exotic"
Paunzen E., Heiter U.
doaj   +1 more source

Multimodal Mechanical Testing of Additively Manufactured Ti6Al4V Lattice Structures: Compression, Bending, and Fatigue

Advanced Engineering Materials, EarlyView.
In this experimental study, the mechanical properties of additively manufactured Ti‐6Al‐4V lattice structures of different geometries are characterized using compression, four point bending and fatigue testing. While TPMS designs show superior fatigue resistance, SplitP and Honeycomb lattice structures combine high stiffness and strength. The resulting
Klaus Burkart, Jonas Schmidt, Anastasiya Toenjes, Johanna Eisenträger   +3 more
wiley   +1 more source

Effects of tidally enhanced stellar wind on the horizontal branch morphology of globular clusters

, 2012
Metallicity is the first parameter to influence the horizontal branch (HB) morphology of globular clusters (GCs). It has been found, however, that some other parameters may also play an important role in affecting the morphology.
Chen, Xue-Fei, Han, Z., Lei, Zhen-Xin, Zhang, Feng-Hui   +3 more
core   +1 more source

3D‐Printed Serial Snap‐Through Architectures for Programmable Mechanical Response

Advanced Engineering Materials, EarlyView.
A serial snap‐through architecture is realized using compact 3D‐printed von Mises truss units arranged in a staged cascade. Their geometry and boundary conditions program multistage mechanical responses with plateaux and re‐hardening regimes. An inverted‐compliance model predicts these behaviors and enables analytical design of programmable force ...
Filipe A. Santos
wiley   +1 more source

The early evolution of Globular Clusters: the case of NGC 2808

, 2004
Enhancement and spread of helium among globular cluster stars have been recently suggested as a way to explain the horizontal branch blue tails, in those clusters which show a primordial spread in the abundances of CNO and other elements involved in ...
Bedin L. R., Bessell M. S., Busso G., Catelan M., D’Antona F., D’Antona F., Francesca D’Antona, Hansen B. M. S., Loup C., Mallia E. A., Piotto G., Sneden C., Sweigart A. V., Ventura P., Ventura P., Vittoria Caloi   +15 more
core   +1 more source

Micropatterned Biphasic Printed Electrodes for High‐Fidelity on‐Skin Bioelectronics

Advanced Functional Materials, EarlyView.
Micropatterned biphasic printed electrodes achieve unprecedented skin conformity and low impedance by combining liquid‐metal droplets with microstructured 3D lattices. This scalable approach enables high‐fidelity detection of ECG, EMG, and EEG signals, including alpha rhythms from the forehead, with long‐term comfort and stability.
Manuel Reis Carneiro, Telmo Lopes, André F. Silva, Carmel Majidi, Mahmoud Tavakoli   +4 more
wiley   +1 more source

Probing the Stellar Populations and Star Formation History of Early-type Galaxies at 0 < z < 1.1 in the Rest-frame Ultraviolet

The Astrophysical Journal
We measure the evolution of the rest-frame near-ultraviolet (NUV)− V colors for early-type galaxies in clusters at 0 < z < 1.1 using data from the Hyper Suprime-Cam Subaru Strategic Program, CFHT Large Area U -band Deep Survey, and local Sloan Digital ...
Sadman S. Ali, Roberto De Propris, Chul Chung, Steven Phillipps, Malcolm N. Bremer, Masato Onodera, Marcin Sawicki, Guillaume Desprez, Stephen Gwyn   +8 more
doaj   +1 more source

Spectroscopy of horizontal branch stars in NGC6752 - Anomalous results on atmospheric parameters and masses

, 2007
We used the ESO VLT-FORS2 facility to collect low-resolution spectra of 51 targets distributed along the Horizontal Branch. We determined atmospheric parameters by comparison with theoretical models through standard fitting routines, and masses by basic ...
A. Recio-Blanco, Behr, Behr, Behr, Behr, Bergeron, C. Moni Bidin, Castelli, Catelan, Edelmann, Edelmann, Fabbian, Faulkner, Ferraro, Flower, G. Piotto, Glaspey, Glaspey, Gratton, Gratton, Grundahl, Hamuy, Harris, Horne, Hoyle, Michaud, Michaud, Moehler, Moehler, Moehler, Moehler, Moehler, Moehler, Moehler, Momany, Momany, Momany, Moni Bidin, Napiwotzki, Pace, Peacock, Peterson, Peterson, Peterson, Piotto, Przybilla, Ramirez, Recio-Blanco, Reid, Reid, Renzini, S. Moehler, Saffer, Sandage, Sandage, Sekiguchi, Sosin, Sweigart, Tüg, van den Bergh, Vink, Y. Momany   +61 more
core   +3 more sources

The distance to the Fornax Dwarf Spheroidal Galaxy [PDF]

, 2007
A large multicolour, wide-field photometric database of the Fornax dwarf spheroidal galaxy has been analysed using three different methods to provide revised distance estimates based on stellar populations in different age intervals.
Aaronson, Aaronson, Azzopardi, Battaglia, Bellazzini, Bellazzini, Bersier, Bersier, Buonanno, Buonanno, Cacciari, Carretta, Carretta, Cole, Da Costa, Demers, E. V. Held, Ferraro, Ferraro, Girardi, Girardi, Greco, Greco, Gullieuszik, I. Saviane, L. Rizzi, Landolt, Lee, M. Gullieuszik, Makarov, Méndez, Paczynski, Pietrzyński, Pietrzyński, Pont, R. B. Tully, Rizzi, Rizzi, Rocha-Pinto, Rocha-Pinto, Sakai, Saviane, Schlegel, Stanek, Stetson, Stetson, Stone, Tolstoy, Tolstoy, Udalski, Udalski, Udalski, Udalski, Udalski, Valdes, Zinn   +55 more
core   +1 more source