Results 91 to 100 of about 3,278,550 (239)
Clusters Stagnating During Condensation: Metastable Material or a Separate State of Matter?
Annalen der Physik, Volume 537, Issue 10, October 2025.Condensation stagnation, that is, the existence of a delay between nucleation and growth during the gas‐phase particle formation, is a crucial phenomenon, which manifests itself as the presence of supercritical clusters in resulting particulates. The light emission signature of stagnant clusters is identified in the magnesium particle flame in air, and,
Nicholas R. Jaramillo +4 more
wiley +1 more source
The Astrophysical Journal, 2022 Very young ( t ≲ 10 Myr) stars possess strong magnetic fields that channel ionized gas from the interiors of their circumstellar disks to the surface of the star.
Hunter Campbell +23 more
doaj +1 more source
Shallow Ultraviolet Transits of WD 1145+017 [PDF]
, 2019 WD 1145+017 is a unique white dwarf system that has a heavily polluted atmosphere, an infrared excess from a dust disk, numerous broad absorption lines from circumstellar gas, and changing transit features, likely from fragments of an actively ...
Dalba, Paul A. +18 more
core +1 more source
The Low Velocity Wind from the Circumstellar Matter Around the B9V Star sigma Herculis
, 2002 We have obtained FUSE spectra of sigma Her, a nearby binary system, with a main sequence primary, that has a Vega-like infrared excess. We observe absorption in the excited fine structure lines C II* at 1037 A, N II* at 1085 A, and N II** at 1086 A that ...
Abgrall H. +10 more
core +1 more source
The Dynamical Evolution of the Circumstellar Gas around Low- and Intermediate-Mass Stars. I. The Asymptotic Giant Branch [PDF]
, 2002 We have investigated the dynamical interaction of low- and intermediate-mass stars (from 1 to 5 M☉) with their interstellar medium (ISM). In this first paper, we examine the structures generated by the stellar winds during the asymptotic giant branch ...
E. Villaver +2 more
semanticscholar +1 more source
Dust Migration and Morphology in Optically Thin Circumstellar Gas Disks [PDF]
, 2000 We analyze the dynamics of gas-dust coupling in the presence of stellar radiation pressure in circumstellar disks, which are in a transitional stage between the gas-dominated, optically thick, primordial nebulae, and the dust-dominated, optically thin ...
T. Takeuchi, P. Artymowicz
semanticscholar +1 more source
Time resolved spectroscopy of dust and gas from extrasolar planetesimals orbiting WD 1145+017
, 2018 Multiple long and variable transits caused by dust from possibly disintegrating asteroids were detected in light curves of WD 1145+017. We present time-resolved spectroscopic observations of this target with QUCAM CCDs mounted in the Intermediate ...
de Mooij, Ernst J. W. +3 more
core +1 more source
The Astrophysical Journal, 2023 The stellar cluster environment is expected to play a central role in the evolution of circumstellar disks. We use thermochemical modeling to constrain the dust and gas masses, disk sizes, UV and X-ray radiation fields, viewing geometries, and central ...
Ryan D. Boyden, Josh A. Eisner
doaj +1 more source
Exocomet Circumstellar Fe I Absorption in the Beta Pictoris Gas Disk
, 2016 We present an archival study of 27 circumstellar Fe i (λ3860 Å) and Ca ii (λ3933 Å) absorption spectra of the β Pictoris system recorded over the 2003–2014 timeframe.
B. Welsh, Sharon L. Montgomery
semanticscholar +1 more source
Astronomische Nachrichten, Volume 345, Issue 8, October 2024.Abstract Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self‐gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and—under suitable conditions—lead to the direct formation of gas‐giant planets.
Oliver Gressel, Udo Ziegler
wiley +1 more source