28 Result(s)

Chapter

ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33A

ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.40 µm. The position and width of these features indicates that they are due to...

W. A. Schutte, J. M. Greenberg, E. F. van Dishoeck… in Astrophysics and Space Science (1998)

Article

ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33A

ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.40 µm. The position and width of these features indicates that they are due to...

W.A. Schutte, J.M. Greenberg, E.F. Van Dishoeck… in Astrophysics and Space Science (1997)

Chapter and Conference Paper

Each Chairperson Reflects on Their Session...

Editorial comment: Some of the Chairpersons have provided us with a summary of the papers presented in their session, while others have given a summary of the discussion following the papers. We trust that reader...

D. L. Block, J. M. Greenberg in New Extragalactic Perspectives in the New South Africa (1996)

Chapter and Conference Paper

Formaldehyde and Methanol Dominated Ices Toward GL 2136

Infrared spectroscopy towards the embedded massive protostellar object GL 2136 reveals 2 absorption features at 3.47 and 3.54 µm. Through comparison with spectra of laboratory ice mixtures, an identification with...

W. A. Schutte, P. A. Gerakines, T. R. Geballe… in The Role of Dust in the Formation of Stars (1996)

Chapter and Conference Paper

On the Possible Detection of Solid O₂ in Interstellar Grains

In various models of the chemistry of interstellar grains, solid O₂ is formed by accretion as well as by surface reactions. In dense molecular cloud models, at a later stage of evolution of an interstellar grain,...

P. Ehrenfreund, R. Breukers, L. d’Hendecourt… in Astrochemistry of Cosmic Phenomena (1992)

Chapter

Astromacromolecules: Formation of Very Large Molecules in Interstellar Space

The study of the physical and chemical processes taking place in the interstellar medium is made possible by the creation of laboratory conditions which simulate those relevant in space - low temperature, ultr...

C. X. Mendoza-Gomez, J. M. Greenberg, G. B. Eijkel, J. J. Boon in Chemistry in Space (1991)

Chapter

From Interstellar Dust to Comets to Comet Dust: A Test of the Interstellar Dust Model of Comets

The interstellar dust model of comets is used as a basis to simultaneously satisfy various observational constraints and to derive the porosity of comet dust. The observational constraints are: (1) the strengt...

J. M. Greenberg, J. I. Hage in Chemistry in Space (1991)

Chapter

Bioastronomy — Search for Extraterrestrial Life

The past three years have seen not only a growth in the activities of our commission, but an extension of its activities into important areas which have heretofore motivated too little activity. Of particular ...

Frank D. Drake, George Marx, M. D. Papagiannis, R. D. Brown… in Reports on Astronomy (1988)

Chapter and Conference Paper

Molecular Diffusions in Ices — Implications for the Composition of Interstellar Grain Mantles and Comet Nuclei

It is known that the ice composition of interstellar grains varies from one molecular cloud to another. These differences already start with different cloud formation conditions, such as temperature, gas phase...

B. Schmitt, R. J. A. Grim, J. M. Greenberg in Experiments on Cosmic Dust Analogues (1988)

Chapter and Conference Paper

Interstellar Circular Polarization and the Dielectric Nature

Measurements of interstellar circular polarization are regarded as one of the essential constraints on theoretical models of interstellar grains. Observations accumulated since 1972 indicate that in all lines ...

G. Chlewicki, J. M. Greenberg in Experiments on Cosmic Dust Analogues (1988)

Chapter

Molecular Origin of the 216 NM Interstellar Hump

Vacuum ultraviolet photochemical experiments have been performed in an argon matrix, at low temperature (− 12 K). It appears that starting from a variety of simple organic molecules photo-products are formed w...

G. P. van der Zwet, M. S. de Groot, F. Baas… in Polycyclic Aromatic Hydrocarbons and Astro… (1987)

Article

Introduction

J. M. Greenberg in Astrophysics and Space Science (1986)

Article

The role of grains in molecular chemical evolution

The observations of dust gas in diffuse and molecular clouds are shown to reflect not only their current state but their past history. The interpretation of infrared spectra of dust in molecular clouds using a...

J. M. Greenberg in Astrophysics and Space Science (1986)

Chapter and Conference Paper

Introduction

I am honored to be asked to introduce this second ‘Jena’ meeting on interstellar dust at Georgenthal and I thank the organizers for making this possible. For some of us, interstellar dust had not only provided...

J. M. Greenberg in The Role of Dust in Dense Regions of Interstellar Matter (1986)