Results 101 to 110 of about 13,144 (210)

Does nucleation theory apply to the formation of refractory circumstellar grains?

The Astrophysical Journal, 1985
It is pointed out that kinetic factors inherent in cosmic systems will prevent the attainment of an approximate equilibrium precondensation cluster distribution, and that therefore such systems will violate one of the most fundamental assumptions of nucleation theory.
B. Donn, J. A. Nuth
openaire   +1 more source

2-Dust : a Dust Radiative Transfer Code for an Axisymmetric System [PDF]

, 2002
We have developed a general purpose dust radiative transfer code for an axisymmetric system, 2-Dust, motivated by the recent increasing availability of high-resolution images of circumstellar dust shells at various wavelengths.
Cornette W. M., Dorschner J., Dullemond C. P., Efstathiou A., Jager C., Jager C., Lefevre J., Margaret Meixner, Menshchikov A. B., Siebenmorgen R., Toshiya Ueta, Waters L. B. F. M.   +11 more
core   +2 more sources

Strontium-84 Enrichments in Presolar Grains Provide First Evidence of p-process Nucleosynthesis in Core-collapse Supernovae

The Astrophysical Journal Letters
This study reports detection of rare p -process isotopes within presolar grains. Presolar grains are relic dust grains from dying stars. These microscopic dust particles are found in primitive solar system materials.
Ishita Pal, Manavi Jadhav, Danielle Z. Shulaker, Michael R. Savina, Marco Pignatari, Lorenzo Roberti, Heather Bouillion, Maria Lugaro, Christopher J. Dory, Frank Gyngard, Noriko Kita, Sachiko Amari   +11 more
doaj   +1 more source

Circumstellar shells and mass loss rates: Clues to the evolution of S stars

, 1997
It is the purpose of this paper to rediscuss the circumstellar properties of S stars and to put these properties in perspective with our current understanding of the evolutionary status of S stars, in particular the intrinsic/extrinsic dichotomy ...
Jorissen, A., Knapp, G. R.
core   +1 more source

Protostellar Chimney Flues: Are Jets and Outflows Lifting Submillimeter Dust Grains from Disks into Envelopes?

The Astrophysical Journal
Low dust opacity spectral indices ( β < 1) measured in the inner envelopes of class 0/I young stellar objects (age ∼10 ^4–5 yr) have been interpreted as the presence of (sub-)millimeter dust grains in these environments.
L. Cacciapuoti, L. Testi, L. Podio, C. Codella, A. J. Maury, M. De Simone, P. Hennebelle, U. Lebreuilly, R. S. Klessen, S. Molinari   +9 more
doaj   +1 more source

The Nucleated Atomistic Grain Growth Simulator (NAGGS): application to the size-dependent structural and physical properties of nanosilicate dust

Astronomy & Astrophysics
Context. The essential physics of dust grains are typically rationalised using phenomenological approaches, often assuming highly simplified grain morphologies.
Mariñoso Guiu Joan, Maciá Escatllar Antoni, Bromley Stefan T.   +2 more
doaj   +1 more source

Magnetic fields in circumstellar disks: The potential of Zeeman observations

, 2017
Context. Recent high angular resolution polarimetric continuum observations of circumstellar disks provide new insights into their magnetic field. However, direct constraints are limited to the plane of sky component of the magnetic field.
Brauer, R., Flock, M., Wolf, S.
core   +1 more source

Hot components and circumstellar grains in M supergiant syncretic binaries

The Astrophysical Journal, 1988
Ultraviolet and infrared spectra were obtained in order to study grains in cool star and hot star syncretic type binaries. Grains are found in only about half of the syncretic systems. The results suggest that grains have not formed in many syncretic systems because of ultraviolet radiation from the hot star.
Richard H., Jr. Buss, Theodore P., Jr. Snow   +1 more
openaire   +1 more source

The Spheroidal Analog Method for Modeling Irregular Porous Aggregates

The Astrophysical Journal
It is shown that the optical properties of an irregular porous grain with effective radius a _eff  ≲ 3 λ (where λ is the wavelength) can be well approximated by a “spheroidal analog”: a spheroid with appropriate axial ratio and size, with a dielectric ...
B. T. Draine
doaj   +1 more source

87th Annual Meeting of the Meteoritical Society 2025: Abstracts

Meteoritics &Planetary Science, Volume 60, Issue S1, Page 30-350, August 2025.
wiley   +1 more source