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The Composition of Interstellar Molecular Clouds
Space Science Reviews, 1999We 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.
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Interstellar and Atmospheric Clouds
Nature, 1970WE wish to draw attention to a novel and striking similarity between the physics of two apparently quite disparate situations—the behaviour of the interstellar medium and of water vapour in an atmospheric cloud.
G. R. EVANS, M. V. PENSTON
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Molecules in Interstellar Clouds
1981The physical and chemical state of interstellar clouds is reviewed, including recent investigations at the Onsala Space Observatory. The Orion A region is chosen as an example of a “giant” molecular cloud and hence a formation site for massive stars. The Taurus Molecular Clouds, in contrast, may be the future birthplace of solar-type stars.
Irvine, William M. +2 more
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Astrophysics and Space Science, 1978
Equilibrium masses of slowly rotating interstellar gas clouds have been calculated using an equation of state for the interstellar gas developed by Penston and Brown. The rotation is found to increase the equilibrium masses, but still the cloud masses are not as large as indicated by other considerations.
A. N. Dharmani, V. B. Bhatia
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Equilibrium masses of slowly rotating interstellar gas clouds have been calculated using an equation of state for the interstellar gas developed by Penston and Brown. The rotation is found to increase the equilibrium masses, but still the cloud masses are not as large as indicated by other considerations.
A. N. Dharmani, V. B. Bhatia
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Fragmentation of Interstellar Clouds
2014The 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.
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Translucent Interstellar Clouds
2011A 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.
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The Expansion of an Interstellar Gas-Cloud into a Vaccum*
Monthly Notices of the Royal Astronomical Society, 1950Untersucht wird die eindimensionale Bewegung von H-Atomen aus einer interstellaren Gaswolke in ein Vakuum für die beiden Fälle, daß a) die Gaswolke isotherm ist und daß b) in der Gaswolke ein Temperaturgradient senkrecht zur Grenzfläche der Wolke existiert. Angewendet wird die Riemannsche Lösungsmethode für die Kontinuitäts- und Bewegungsgleichung.
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