Fragmentation of Molecular Clouds and Star Formation: Proceedings of the 147th Symposium of the International Astronomical Union, Held in Grenoble, France, June 12–16, 1990

Front Matter....Pages i-xxiv
Front Matter....Pages 1-1
Characteristics Of The Diffuse Interstellar Medium....Pages 3-10
On The Structure and Kinematics of Molecular Clouds from Large Scale Mapping of MM-Lines....Pages 11-20
Observational Manifestations of Sequential Star Formation in Giant Star-Gas Complexes of the Galaxy....Pages 21-24
A CS Survey of Massive Stars Embedded in Molecular Clouds....Pages 25-28
Diffuse Molecular Clouds at High Galactic Latitude....Pages 29-35
The atomic hydrogen/molecular cloud association: an unavoidable relationship....Pages 37-40
Front Matter....Pages 41-41
Magnetic Fields in Dense Regions....Pages 43-60
Structure in The Gas and Magnetic Field in S106....Pages 61-64
The Investigation of the Hierarchical Structure of the Interstellar Magnetic Fields....Pages 65-66
Loss of Magnetic Flux and Angular Momentum from Molecular Clouds....Pages 67-74
Magnetic Fields and the Dynamics of Molecular Clouds....Pages 75-81
Turbulence and Magnetic Fields in Molecular Clouds....Pages 83-92
Dynamical Conditions of Dense Clumps in Dark Clouds: A Strategy for Elucidation....Pages 93-99
Numerical Simulations of Turbulent Compressible Flows....Pages 101-118
Signatures of Turbulence in the Dense Interstellar Medium....Pages 119-136
Front Matter....Pages 137-137
Chemistry and Small-Scale Structure of Diffuse and Translucent Clouds....Pages 139-150
Variations in the Abundance of Small Particles....Pages 151-160
Physical and Chemical Parameters in Dense Cores....Pages 161-175
Abundance Variations of Tracers and their Effects on our Determination of Molecular Cloud Structure....Pages 177-181
Front Matter....Pages 183-183
Magnetohydrodynamic Shock Waves in Molecular Clouds....Pages 185-196
Front Matter....Pages 183-183
Thermal Processes in Molecular Gas....Pages 197-204
On The Origin of Broad Line Wings in Molecular Cloud Spectra....Pages 205-209
The Development Of Modes Of Thermal Instability In A Nonstationary Medium (Production Of OH Maser Condensations)....Pages 211-214
Large-Scale Fragmentation of Gas Cloud Rotating at The Galactic Center....Pages 215-217
Front Matter....Pages 219-219
Clouds, Cores, and Stars in the Nearest Molecular Complexes....Pages 221-228
Dense Core Structure and Fragmentation in The Rho Ophiuchi Molecular Cloud....Pages 229-233
Uv Penetrated Clumpy Molecular Cloud Cores....Pages 235-244
Dust Emission from Star Forming Clouds: A Progress Report....Pages 245-257
Front Matter....Pages 259-259
Some Processes Influencing the Stellar Initial Mass Function....Pages 261-273
A Comparative Study of Star Formation Efficiencies in Nearby Molecular Cloud Complexes....Pages 275-288
Luminosity Function, Star Density, and Star Formation Efficiency in Regions of Star Formation....Pages 289-292
Star Formation in three Nearby Cloud Complexes....Pages 293-315
Wave Dynamics and Star Formation in Taurus....Pages 317-327
Front Matter....Pages 329-329
Theoretical and Observational Aspects of Young Stars of Intermediate Mass....Pages 331-344
A Survey of Circumstellar Structure around Young Low Mass Stars....Pages 345-352
Aperture Synthesis CS and 98 GHz Continuum Observations of Protostellar IRAS Sources in Taurus....Pages 353-356
Aperture Synthesis Observations of Orion-KL in CS lines and 3mm Continuum....Pages 357-360
A 45 AU Radius Source around L1551-IRS 5: A Possible Accretion Disk....Pages 361-372
Strong Magnetic Fields in Bipolar Outflows....Pages 373-376
Front Matter....Pages 379-379
Symposium Summary: Fragmentation and Star Formation in Molecular Clouds....Pages 379-386
Front Matter....Pages 387-387
High-Velocity Molecular Bullets in Bipolar outflows: L1448 and HH7-11....Pages 389-390
The Effects of Ionizing Radiation on Star Formation in Molecular Clouds....Pages 391-393
Transfer of Continuum UV Radiation inside Fragmented Clouds....Pages 394-395
Do Random Velocity Fields Inhibit or Induce Gravitational Collapse and Fragmentation?....Pages 396-397
Fragmentation in Molecular Clouds....Pages 398-399
Velocity Correlations in Turbulent Molecular Clouds....Pages 400-401
MHD Instabilities and Fragmentation of Molecular Clouds....Pages 402-404
A Multi-Transition and Multi-Isotope Study of CO in The Giant Molecular Cloud Orion-A....Pages 405-406
Processes Controlling the Initial Mass Function: Interstellar Turbulence and Magnetic Fields....Pages 407-408
Effects of the UV Radiation on the Surrounding Gas and Dust....Pages 409-410
High Resolution Infrared Maps of Iras Galaxies....Pages 411-412
Interpretation of Low J 12 CO and 13 CO Observations of Orion a By Means of an Onion Shell Radiative Transfer Model....Pages 413-414
Global Properties Of Star Formation In Taurus....Pages 415-416
Polarization Of Background Starlight And The Structure Of The Interstellar Magnetic Field....Pages 417-423
First Detection of 661 GHz 13 CO J=6→5: Large Amounts of Warm Molecular Gas....Pages 424-426
“The Mass Distribution of the Young Stellar Population in Chamaeleon I and in Rho Ophiuchi”....Pages 427-429
Dense Cloud Cores....Pages 430-431
Gravitational Instability Induced by Collisions between non-identical Clouds....Pages 432-433
CO Multitransition Observations of L 1228: A Molecular Outflow Destructing its Parent Cloud?....Pages 434-435
Ammonia Clumps in the Orion and Cepheus Clouds....Pages 436-437
Front Matter....Pages 387-387
Observational Constraints on Angular Momentum Transfer During Gravitational Collapse....Pages 438-439
Megamasers as Probes of Galaxy Mass Spectrum Evolution....Pages 440-440
Magnetic Fields in the Solar Nebula and the Angular Momentum Transfer....Pages 441-442
Physical conditions of star forming sites in the S247/252 molecular complex....Pages 443-444
Hierarchical Fragmented Structure of Molecular Clouds Produced by Supersonic Turbulence....Pages 445-446
The Bipolar-Flow Phenomenon....Pages 447-448
A Hydrodynamical Model for the Fragmentation of the W49A Star-Forming Region....Pages 449-450
“CO Line Broadening by Saturation Effect in Molecular Clouds”....Pages 451-453
The High Latitude Cloud Lynds 1642 is not Breaking up....Pages 454-455
Large Scale Interaction of the Outflow and Quiescent Gas in Orion....Pages 456-457
Physical parameters in extragalactic star forming regions....Pages 458-459
An 8″ resolution CO (J=;3-2) map of IC342....Pages 460-461
A Large Scale Survey of Dense Cores and Molecular Outflows in Ophiuchus....Pages 462-463
A Hydrodynamical Study of Fragmenting Gas Clouds....Pages 464-465
New Sample of Young Stellar Objects....Pages 466-475
Comparison of Turbulence in Hii Regions and Molecular Clouds....Pages 476-479
Fragmentary Structure in the L1551 Molecular Outflow....Pages 480-481
Observations of Variability of H 2 O Maser Sources Associated with Star Formation Regions....Pages 482-484
A Model of The Distribution of Ionised Carbon in M17SW....Pages 485-486
Estimates of Magnetic Fields in Interstellar Gas Clouds From 18-CM OH Satellite Lines....Pages 487-488
Front Matter....Pages 387-387
 15 NH 3 Millimasers Toward NGC7538-Irs 1....Pages 489-490
A Very Straight And Collimated Outflow In The Core....Pages 491-493
Density and Kinematics of The W49A Cloud Core....Pages 494-495
Synthetic Linemaps for Hierarchial Clouds....Pages 496-497
Bright-Rimmed Clouds With Iras Point Sources: Candidates For Star Formation by Radiation-Driven Implosion....Pages 498-499
Density structure of dense cores in the Cepheus molecular cloud....Pages 500-501
Turbulence in TMC1-C and ρ-Oph core....Pages 502-503
Radiative Transfer of CO through Clumpy Molecular Clouds with External UV Heating....Pages 504-504
Characterisation of Spatial Structure in Molecular Clouds....Pages 505-507
Measuring The Fractal Structure of Interstellar Clouds....Pages 508-510
The W75 - Cygnus - X Iras Loop:- ob - ‘Bubble’ or Snr ?....Pages 511-512
An Extensive Study of Interstellar Matter in the IC 1396 Region using several Molecular Lines and Transitions of CO and Far-Infrared Maps from IRAS....Pages 513-514
Gravitational Virilization of Molecular Cloud Fragments....Pages 515-518
Turbulent Amplification of Interstellar Magnetic Fields....Pages 519-522
Cloud-Cloud Collisions and Fragments....Pages 523-525
A Binary Star Formation Mechanism Through The Fragmentation of Prolate Dense Cores Rotating end over end....Pages 526-528
Back Matter....Pages 529-556