Results 101 to 110 of about 627,475 (313)

HIP 8522: A Puzzling Young Solar Twin with the Lowest Detected Lithium Abundance

The Astrophysical Journal
We present HIP 8522, a young solar twin with the lowest detected lithium abundance, potentially a field blue straggler or the result of episodic early accretion. Its stellar parameters ( T _eff  = 5729 ± 7 K, $\mathrm{log}\,g$  = 4.532 ± 0.016 dex, [Fe/H]
Jhon Yana Galarza, Diego Lorenzo-Oliveira, Thiago Ferreira, Henrique Reggiani, Aida Behmard, Joshua D. Simon, Eder Martioli, Ricardo López-Valdivia, Leandro de Almeida, Emiliano Jofré, Kareem El-Badry   +10 more
doaj   +1 more source

Blue Straggler Stars in Galactic Open Clusters and the effect of field star contamination [PDF]

, 2008
We investigate the distribution of Blue Straggler stars in the field of three open star clusters. The main purpose is to highlight the crucial role played by general Galactic disk fore-/back-ground field stars, which are often located in the same region of the Color Magnitude Diagram as Blue Straggler stars.
arxiv   +1 more source

The blue straggler V106 in NGC 6791: a prototype progenitor of old single giants masquerading as young [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We determine the properties of the binary star V106 in the old open cluster NGC6791. We identify the system to be a blue straggler cluster member by using a combination of groundbased and Kepler photometry and multi-epoch spectroscopy.
K. Brogaard, K. Brogaard, S. M. Christiansen, F. Grundahl, A. Miglio, A. Miglio, R. Izzard, T. Tauris, T. Tauris, T. Tauris, E. Sandquist, D. VandenBerg, J. Jessen-Hansen, T. Arentoft, H. Bruntt, S. Frandsen, J. Orosz, G. Feiden, R. Mathieu, A. Geller, M. Shetrone, N. Ryde, D. Stello, D. Stello, D. Stello, I. Platais, S. Meibom   +26 more
semanticscholar   +1 more source

A MEMS Electromagnetic Vibration Energy Harvester with Monolithically Integrated NdFeB Micromagnets

Advanced Materials Technologies, EarlyView.
50µm thick sputtered arrays of NdFeB micromagnets are directly integrated into a functional MEMS in‐plane electromagnetic vibration energy harvester. A combination of analytical modeling and numerical simulations guided the design of the magnet arrays and ad‐hoc coil, to produce a high transduction factor.
Ilona Lecerf, José Elìas Angulo‐Cervera, Frederico Orlandini‐Keller, Pierre Moritz, Fabrice Mathieu, David Bourrier, Samuel Charlot, Liviu Nicu, Thierry Leïchlé, Thibaut Devillers, Richard Haettel, Nora M. Dempsey, Thomas Blon, Lise‐Marie Lacroix   +13 more
wiley   +1 more source

Extending MIEZE spectroscopy towards thermal wavelengths

Journal of Applied Crystallography, Volume 55, Issue 6, Page 1424-1431, December 2022., 2022
A modulation of intensity with zero effort (MIEZE) setup is proposed for high‐resolution neutron spectroscopy at momentum transfers up to 3 Å−1, energy transfers up to 20 meV and an energy resolution in the microelectronvolt range using both thermal and cold neutrons.A modulation of intensity with zero effort (MIEZE) setup is proposed for high ...
Johanna K. Jochum, Christian Franz, Thomas Keller, Christian Pfleiderer   +3 more
wiley   +1 more source

Contribution of primordial binary evolution to the two blue-straggler sequences in globular cluster M30 [PDF]

, 2017
Two blue-straggler sequences discovered in globular cluster M30 provide a strong constraint on the formation mechanisms of blue stragglers. We study the formation of the blue-straggler binaries through binary evolution, and find that binary evolution can contribute to the blue stragglers in both of the sequences.
arxiv   +1 more source

Blue straggler stars

This is a pre-print of a chapter for the Encyclopedia of Astrophysics (edited by I. Mandel, section editor F.R.N.
Wang, Chen, Ryu, Taeho
openaire   +2 more sources

FORMATION AND EVOLUTION OF BLUE STRAGGLERS IN 47 TUCANAE [PDF]

The Astrophysical Journal, 2016
ABSTRACT Blue stragglers (BSS) are stars whose position in the color–magnitude diagram (CMD) places them above the main sequence (MS) turn-off (TO) point of a star cluster. Using data from the core of 47 Tuc in the ultraviolet (UV), we have identified various stellar populations in the CMD, and used their radial distributions to study ...
Ryan Goldsbury, Javiera Parada, Harvey B. Richer, Jason S. Kalirai, Jason S. Kalirai, Jeremy S. Heyl   +5 more
openaire   +4 more sources

Programmable Wide‐Spectrum Complex Microcavity Laser Controlled by Liquid Crystal Elastomer Braking Mechanism

Advanced Photonics Research, EarlyView.
A nematic liquid crystal elastomer (LCE) exhibiting dynamic laser oscillation behavior modulated by mechanical stretching and contraction is synthesized. This study investigates the influence of liquid crystal elastomer deformation characteristics on multidimensional complex microcavity laser systems.
Hongyang Zhu, Bingquan Zhao, Zhen He, Junxin Wei, Chensha Li   +4 more
wiley   +1 more source

UOCS XIV: Study of the Open Cluster NGC 2627 Using UVIT/AstroSat

The Astronomical Journal
We study the intermediate-age open cluster NGC 2627, located at a distance of ∼2 kpc, using UVIT/AstroSat and other archival data. Using a machine learning-based algorithm, ML-MOC, on the Gaia DR3 data, we identify 422 cluster members, including four ...
Pinapati Saketh, Anju Panthi, Kaushar Vaidya   +2 more
doaj   +1 more source