Results 221 to 230 of about 789,439 (256)

The Composition of Interstellar Molecular Clouds

Space Science Reviews, 1999
We consider four aspects of interstellar chemistry for comparison with comets: molecular abundances in general, relative abundances of isomers (specifically, HCN and HNC), ortho/para ratios for molecules, and isotopic fractionation, particularly for the ratio hydrogen/deuterium.
openaire   +3 more sources

Translucent Interstellar Clouds

2011
A translucent interstellar cloud is one that has visual extinction intermediate between that of a ▶ diffuse cloud and that of a dense ▶molecular cloud. Despite the importance of photochemical processes over much of their extent, translucent clouds contain significant molecular column densities.
openaire   +1 more source

Thermal instability in magnetized interstellar clouds

Astronomical & Astrophysical Transactions, 1997
Abstract The effect of a magnetic field on the ionizational-thermal acoustic instability in the cold diffuse ISM is discussed in this paper. It is found that the frozen-in magnetic field leads to new types of instabilities called “magnetoacoustic” instabilities.
Alexander E. Dudorov, Constantine E. Stepanov   +1 more
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The chemical composition of interstellar molecular clouds

Origins of Life, 1984
The published version is located at http://www.springerlink.com/content/w327411847532321/
Irvine, William M., HJALMARSON, A
openaire   +3 more sources

Interstellar Cloud Chemistry Revisited

1987
My first encounter with interstellar cloud chemistry (Bates and Spitzer 1951) took place 35 years ago. The field then had a semblance of simplicity. Absorption lines in the spectra of a number of stars had revealed the existence of molecules in interstellar space.
openaire   +1 more source

Anomalous 13C isotope abundances in C3S and C4H observed toward the cold interstellar cloud, Taurus Molecular Cloud-1.

Journal of Physical Chemistry A, 2013
N. Sakai, S. Takano, T. Sakai, S. Shiba, Y. Sumiyoshi, Y. Endo, S. Yamamoto   +6 more
semanticscholar   +1 more source

Fragmentation of Interstellar Clouds

2014
The dense cores that form stars through gravitational collapse are embedded in much larger and more rarefied expanses of gas. How the parent▶molecular cloud produces its substructure of dense cores is the problem of fragmentation. The traditional view is that the parent cloud breaks apart as it collapses in on itself.
openaire   +1 more source

The stardust abundance in the local interstellar cloud at the birth of the Solar System

, 2017
P. Hoppe, J. Leitner, J. Kodolányi
semanticscholar   +1 more source

Is the solar system entering a nearby interstellar cloud

, 1978
A. Vidal-Madjar, C. Laurent, P. Bruston, J. Audouze   +3 more
semanticscholar   +1 more source

The abundance of atomic 1H, 4He and 3He in the local interstellar cloud from pickup ion observations with SWICS on Ulysses

, 1996
G. Gloeckler
semanticscholar   +1 more source