Results 11 to 20 of about 239,951 (165)
Experimental Phase Function and Degree of Linear Polarization of Light Scattered by Hydrogenated Amorphous Carbon Circumstellar Dust Analogs [PDF]
The Astrophysical Journal Supplement Series, 2023 Astronomical observations of the polarized intensity of scattered visible light have revealed the presence of dust envelopes around different types of evolved stars.
Juan Carlos Gómez Martín +10 more
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Dust in circumstellar disks [PDF]
, 2006 This thesis presents observational and theoretical studies of the size and spatial distribution of dust particles in circumstellar disks. Using millimetre interferometric observations of optically thick disks around T Tauri stars, I provide conclusive evidence for the presence of millimetre- to centimetre-sized dust aggregates.
Rodmann, Jens
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From Dust to Nanodust: Resolving Circumstellar Dust from the Colliding-wind Binary Wolf-Rayet 140 [PDF]
The Astrophysical Journal, 2023 Wolf-Rayet (WR) 140 is the archetypal periodic dust-forming colliding-wind binary that hosts a carbon-rich WR (WC) star and an O-star companion with an orbital period of 7.93 yr and an orbital eccentricity of 0.9.
Ryan M. Lau +19 more
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Composite grains: Application to circumstellar dust [PDF]
Atti della Accademia Peloritana dei Pericolanti : Classe di Scienze Fisiche, Matematiche e Naturali, 2011 Using the discrete dipole approximation (DDA) we calculate the absorption efficiency of the composite grain, made up of a host silicate spheroid and inclusions of graphite, in the spectral region 5.0-25.0μm.
D. B. Vaidya, R. Gupta
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Dust motion and possibility of dust growth in a growing circumstellar disk
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT We calculate the evolution of a star-forming cloud core using a three-dimensional resistive magnetohydrodynamics simulation, treating dust grains as Lagrangian particles, to investigate the dust motion in the early star formation stage.
Shunta Koga, Masahiro N Machida
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Modelling and observations of molecules in discs around young stars [PDF]
, 2013 This thesis contains a study of molecules within circumstellar discs around young stars. Firstly, the chemistry of a disc around a young, Class 0 protostar is modelled.
Ilee, John David
core +6 more sources
NIKA2 observations around LBV stars Emission from stars and circumstellar material [PDF]
EPJ Web of Conferences, 2020 Luminous Blue Variable (LBV) stars are evolved massive objects, previous to core-collapse supernova. LBVs are characterized by photometric and spectroscopic variability, produced by strong and dense winds, mass-loss events and very intense UV radiation ...
Ricardo Rizzo J. +2 more
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Circumstellar Dust and Circumstellar Extinction Curves [PDF]
Astrophysics and Space Science, 1995 We have calculated the circumstellar extinction curves produced by dust grains which absorb and scatter the stellar radiation in the shells of pre-main-sequence stars. A Monte Carlo method was used to model the radiative transfer in non-spherical shells. The dependence on the particle size distribution and the dust shell parameters has been examined.
Voshchinnikov, N.V. +2 more
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Comets and Circumstellar Dust [PDF]
Highlights of Astronomy, 2002 AbstractSpectra obtained with the Infrared Space Observatory ISO of the dusty disks surrounding young stars display several characteristics which suggest the presence of large amounts of cometary material during these early stages. Of special interest are crystalline silicates and hydrated silicates, which surprisingly appear to be present already in ...
Waelkens, C., Waters, L.B.F.M.
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Yellow Supergiants and Post-red Supergiant Evolution in the Large Magellanic Cloud
The Astronomical Journal, 2023 The empirical evidence for an upper-mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 MSun, raises questions about the fate of the most luminous, most massive RSGs.
Roberta M. Humphreys +2 more
doaj +1 more source