The Role of Dust in Dense Regions of Interstellar Matter : Proceedings of the Jena Workshop, Held in Georgenthal, G.D.R., March 10–14, 1986

TH. HENNING and B. STECKLUM University Observatory. Jena This workshop was organized by the University Observatory Jena and devoted to the physics and chemistry of dense regions of interstellar matter. It was especially dealing with the properties of interstellar dust grains and star formation in those regions. This field of research was opened in Jena already in the 1950s and an early fA U Colloquium on the topic of interstellar matter was held here in 1969. Since that time, the subject of interstellar matter has grown into a much more important part of astrophysics than it was in 1969. Now we are beginning to understand the process of star formation in a greater detail. The discovery of many interstellar molecules by radioastronomers opened the new field of interstellar chemistry. In addition, the application of the new techniques of infrared astronomy led to the discovery of several absorption bands, e. g. , the 3. 1 11m ice band, which pointed to the existence of grain mantles. More recently, the detection of infrared emission lines was the first hint to the existence of a new component of interstellar matter. All these things were discussed extensively during the workshop. The very successful IRAS mission, which was also a subject of this workshop, gave us many new insights and unexpected findings, e. g. , the detection of infrared cirrus clouds. Front Matter....Pages i-x Preface....Pages 1-1 Introduction....Pages 3-3 Dust Models Confronted with Observations....Pages 5-16 The Role of Grains in Molecular Chemical Evolution....Pages 17-31 Interstellar Gas Depletion and Dust Parameters....Pages 33-42 On the Geometrical Cross-Section of an N-Mer....Pages 43-46 Experimental Investigations of Astronomically Important Interstellar Silicates....Pages 47-69 Problems with the Interpretation of the 220 nm Interstellar Feature....Pages 71-81 Observations of the Very Broad-Band Structure by Combined uvby and UBV Photometry....Pages 83-92 Carbon Molecules as Possible Carrier of the Diffuse Interstellar Bands....Pages 93-99 Astrophysical Influences on the Diffuse Interstellar Lines....Pages 101-109 Submm/Far-Infrared Observations of Cold and Warm Dust Clouds....Pages 111-124 On the Dust and Gas Associated with Sharpless 252....Pages 125-133 The RHO Ophiuchi Cloud — An Overview....Pages 135-149 The Relation between Molecular Clouds and Stellar Kinematics....Pages 151-156 The IRAS Satellite — Some Remarks on the Data, Their Availability and their Use in Leiden....Pages 157-162 Circumstellar Dust Shells Around Very Young and Massive Stars....Pages 163-177 Bipolar Nebulae and Jets from Young Stars: Contributions from Calar Alto....Pages 179-197 BN Objects — A Class of Very Young and Massive Stars....Pages 199-216 Centers of Activity in Dust Clouds....Pages 217-228 The Simulation of the Initial Mass Function and Star Formation Efficiency....Pages 229-235 Self-Regulated Star Formation and the Evolution of Stellar Systems....Pages 237-252 The Past Star-Formation Rate and the Initial Mass-Function in the Solar Neighbourhood....Pages 253-264 Concluding Remarks....Pages 265-265 Back Matter....Pages 266-266 Proceedings of the Jena Workshop, held in Georgenthal, GDR, March 10-14, 1986