Results 171 to 180 of about 293,009 (201)

Low-Temperature Aqueous Alteration of Chondrites. [PDF]

Space Sci Rev
Lee MR, Alexander CMO, Bischoff A, Brearley AJ, Dobrică E, Fujiya W, Le Guillou C, King AJ, van Kooten E, Krot AN, Leitner J, Marrocchi Y, Patzek M, Petaev MI, Piani L, Pravdivtseva O, Remusat L, Telus M, Tsuchiyama A, Vacher LG.   +19 more
europepmc   +1 more source

Carbon and oxygen isotope evidence for a protoplanetary disk origin of organic solids in meteorites. [PDF]

Proc Natl Acad Sci U S A
Lawrence WM, Blake GA, Eiler J.
europepmc   +1 more source

Formation of Interstellar C60 from Silicon Carbide Circumstellar Grains [PDF]

Astrophysical Journal Letters, 2019
Made available in DSpace on 2019-07-15T22:16:48Z (GMT). No. of bitstreams: 2 3939.pdf: 16423 bytes, checksum: 8b77877247b4b57bab698bf9c3dfa799 (MD5) license.txt: 4802 bytes, checksum: 58353f9dd6876860dd5221f3d7872a95 (MD5) Previous issue date: 2019-06 ...
Jane Y Howe, Lucy Ziurys, Thomas J Zega
exaly   +5 more sources

Reservoir for Comet Material: Circumstellar Grains [PDF]

Space Science Reviews, 2007
Primitive meteorites and interplanetary dust particles contain small quantities of dust grains with highly anomalous isotopic compositions. These grains formed in the winds of evolved stars and in the ejecta of stellar explosions, i.e., they represent a sample of circumstellar grains that can be analyzed with high precision in the laboratory.
Peter Hoppe
exaly   +3 more sources

Circumstellar grains and the intrinsic polarization of starlight

Astrophysical Journal, 1975
Twenty-five long-period variable stars exhibiting intrinsic variable polarization have been monitored over the range 3.5-11 microns for several cycles. No conclusive evidence for gross changes in amount of circumstellar grains has been found. Thus circumstellar infrared emission is attributed to the total abundance of grains surrounding the star ...
W A Stein, F C Gillett, W J Forrest
exaly   +2 more sources

On the Composition of Circumstellar Grains

Astrophysical Journal, 1969
Circumstellar grain compositions of stars with various O to C abundance ratios, calculating molecular equilibrium of condensates and gaseous compounds in stellar ...
exaly   +2 more sources

Inefficient Growth of SiOx Grains: Implications for Circumstellar Outflows

Astrophysical Journal Letters, 2022
Abstract To explain observations of abundant circumstellar dust and high stellar wind velocity, most models simply postulate the efficient nucleation and growth of silicate dust particles. Here, we report measurement of the SiO–(SiOx)n grain sticking coefficient in a microgravity sounding rocket experiment, indicating very inefficient (0.
Yuko Inatomi, Kyoko K Tanaka, Yuki Kimura   +2 more
exaly   +3 more sources

Vertical settling and radial segregation of large dust grains in the circumstellar disk of the Butterfly Star

Astronomy and Astrophysics, 2013
International audienceContext: Circumstellar disks are considered to be the environment for the formation of planets. The growth of dust grains in these disks is the first step in the core accretion-gas capture planet formation scenario.
Klaus Pontoppidan, Sebastian Wolf, Jürgen Sauter   +2 more
exaly   +2 more sources

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Interstellar grain size spectrum and circumstellar grain-grain collisions

Astrophysics and Space Science, 1982
In this paper, grain-grain collisions, which were recently suggested by Biermann and Harwit (1980) to occur in cool circumstellar envelopes and to be responsible for the interstellar grain size spectrum, are investigated. On the basis of the author's fragmentation theory, it is shown that in the result of such collisions size distributions of the typen(
J Dörschner
exaly   +2 more sources

Circumstellar Grains

2023
exaly   +2 more sources