Results 31 to 40 of about 309 (219)

X3: A High-mass Young Stellar Object Close to the Supermassive Black Hole Sgr A*

The Astrophysical Journal, 2023
To date, the proposed observation of young stellar objects (YSOs) in the Galactic center still raises the question of where and how these objects could have formed due to the violent vicinity of Sgr A*.
Florian Peißker, Michal Zajaček, Nadeen B. Sabha, Masato Tsuboi, Jihane Moultaka, Lucas Labadie, Andreas Eckart, Vladimír Karas, Lukas Steiniger, Matthias Subroweit, Anjana Suresh, Maria Melamed, Yann Clénet   +12 more
doaj   +1 more source

Faint but Not Forgotten. I. First Results from a Search for Astrospheres around AGB Stars in the Far-ultraviolet

The Astronomical Journal, 2023
Using the GALEX archive, we have discovered extended structures around ten asymptotic giant branch (AGB) stars (out of a total 92 searched) emitting in the far-ultraviolet (FUV) band.
Raghvendra Sahai, Benjamin Stenger
doaj   +1 more source

Gamma-ray emission from early-type stars interacting with AGN jets

EPJ Web of Conferences, 2013
We study the interaction of early-type stars with the jets of active galactic nuclei. A bow-shock will form as a consequence of the interaction of the jet with the winds of stars and particles can be accelerated up to relativistic energies in these ...
Araudo Anabella T., Bosch-Ramon Valentí, Romero Gustavo E.   +2 more
doaj   +1 more source

OB runaway stars originating in the Vel OB1 association

Astronomy & Astrophysics
Context. OB runaway stars are massive stars moving through interstellar space with a high velocity (up to 200 km s−1). They are produced by dynamical ejections in young massive clusters or by supernova explosions in massive binaries.
Azatyan N., Kaper L., Samsonyan A., Stoop M., Andreasyan D., van den Eijnden J., Nikoghosyan E.   +6 more
doaj   +1 more source

Does Long‐Term Lower Extremity Strength Training in Adults With Knee Osteoarthritis and Varus Alignment Reduce Knee Joint Loading During Gait?

Arthritis Care &Research, EarlyView.
Objective We examined whether 18 months of strength training in individuals with knee varus alignment and medial tibiofemoral osteoarthritis (OA) reduced knee joint loads during walking compared to an attention control group. Methods This study was a secondary analysis of a randomized clinical trial that compared the effects of strength training to a ...
Stephen P. Messier, Matthew N. Vigliotti, Paige E. Rice, Brian Pietrosimone, Shannon L. Mihalko, Edward H. Ip, Richard F. Loeser, David J. Hunter, Ali Guermazi, Ryan Hill, Santiago Saldana, Kim L. Bennell, Paul DeVita   +12 more
wiley   +1 more source

Energy Dissipation in Strong Collisionless Shocks: The Crucial Role of Ion-to-electron Scale Separation in Particle-in-cell Simulations

The Astrophysical Journal Letters
Energy dissipation in collisionless shocks is a key mechanism in various astrophysical environments. Its nonlinear nature complicates analytical understanding and necessitates particle-in-cell (PIC) simulations. This study examines the impact of reducing
Mohamad Shalaby
doaj   +1 more source

The visibility of the Mach disk and the bow shock of a stellar jet

The Astrophysical Journal, 1989
This paper uses a simple model to determine which of the two principal shocks at the end of a stellar jet, the bow shock or the Mach disk, emits more light at H-beta. It is found that the two shocks should have comparable surface brightness provided the jet and ambient medium densities do not differ by more than one to two orders of magnitude, and both
openaire   +1 more source

Strong Bow Shocks: Turbulence and an Exact Self-similar Asymptotic

The Astrophysical Journal
We show that strong bow shocks are turbulent and nonuniversal near the head but asymptote to a universal, steady, self-similar, and analytically solvable flow in the downstream.
Marcus DuPont, Andrei Gruzinov, Andrew MacFadyen   +2 more
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

The Wind beneath My Wings. I. Spectral Types and Multiplicity of the Central Stars Supporting Stellar Bow Shock Nebulae

The Astrophysical Journal Supplement Series, 2020
Abstract Arcuate mid-infrared nebulae known as stellar bow shock nebulae (SBNe) have been previously hypothesized to be supported by the strong stellar winds and/or luminosity of massive early-type stars. We present an optical spectroscopic survey of 84 stars identified from mid-infrared images as candidate SBN-supporting stars.
William T Chick, Henry A. Kobulnicky, Danielle P. Schurhammer, Julian E. Andrews, Matthew S. Povich, Elle R. Buser, Don M. Dixon, Michael J. Lindman, Stephan A. Munari, Grace M. Olivier, Rebecca L. Sorber, Heather N. Wernke   +11 more
openaire   +1 more source