Results 1 to 10 of about 33,784 (225)
Composite Circumstellar Dust Grains [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We calculate the absorption efficiencies of composite silicate grains with inclusions of graphite and silicon carbide in the spectral range 5--25$\rm \mu m$. We study the variation in absorption profiles with volume fractions of inclusions. In particular we study the variation in the wavelength of peak absorption at 10 and 18$\rm \mu m$.
Ranjan Gupta +2 more
arxiv +5 more sources
Dust distribution in circumstellar shells [PDF]
Proceedings of the International Astronomical Union, 2011 We present numerical simulations of the hydrodynamical interactions that produce circumstellar shells. These simulations include several scenarios, such as wind-wind interaction and wind-ISM collisions. In our calculations we have taken into account the presence of dust in the stellar wind.
Leen Decin +3 more
arxiv +5 more sources
Dust Motion and Possibility of Dust Growth in a Growing Circumstellar Disk [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 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. We prepare six different-sized set of dust particles in the range $a_{\rm d}=0.01$--$1000\,\mu$m, where $a_{\rm d ...
Shunta Koga, Masahiro N Machida
arxiv +3 more sources
Evolution of Gas and Dust in Circumstellar Disks [PDF]
Symposium - International Astronomical Union, 1999 A clear understanding of the chemical processing of matter as it is transferred from a molecular cloud to a planetary system depends heavily on the physical conditions endured by gas and dust as these accrete onto a disk and are incorporated into planetary bodies.
D. W. Koerner
openalex +5 more sources
Insights Into the Gas-Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study. [PDF]
ChemphyschemThe structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Batra G, Schnell M.
europepmc +2 more sources
Circumstellar Properties of S Stars. I. Dust Features [PDF]
The Astrophysical Journal, 1993 The 1435 stars currently classified as of S spectral type have been searched for association with the IRAS Point Source Catalog. Among the 835 S stars with IRAS counterparts, 149 are found to have usable IRAS low-resolution spectra. The circumstellar properties of these S stars are classified using the LRS.
Pisin Chen, Sun Kwok
openalex +5 more sources
A search for circumstellar dust disks with ADONIS [PDF]
Astronomy & Astrophysics, 2004 To appear in A&A, in ...
O. Schütz +6 more
openalex +5 more sources
The composition of circumstellar gas and dust in 51 Oph [PDF]
Astronomy & Astrophysics, 2001 4 pages, 3 figures, accepted by A&A (letters)
M. E. van den Ancker +4 more
openalex +6 more sources
Properties of Circumstellar Dust in Symbiotic Miras [PDF]
Proceedings of the International Astronomical Union, 2006 Symbiotic binaries with a cool Mira component are characterized by the presence of substantial dust and by the appearance of near-IR obscuration intervals. To understand such symbiotic Miras, their evolution, mutual interactions between the components and circumstellar matter, the influence of stellar winds and mass transfer mechanism, it is essential ...
D. Kotnik-Karuza +2 more
+8 more sources
H2O Maser Emission in Circumstellar Envelopes around AGB Stars: Physical Conditions in Gas-Dust Clouds [PDF]
Astronomy Letters, 2013, Vol. 39, No.10, pp. 717-728, 2013 The pumping of 22.2-GHz H$_2$O masers in the circumstellar envelopes of asymptotic giant branch stars has been simulated numerically. The physical parameters adopted in the calculations correspond to those of the circumstellar envelope around IK Tau. The one-dimensional plane-parallel structure of the gas-dust cloud is considered.
A. V. Nesterenok
arxiv +3 more sources