Highlights of Astronomy: As presented at the XIVth General Assembly of the I.A.U. 1970

Front Matter....Pages I-XII
Front Matter....Pages 1-1
Pulsars....Pages 3-19
Pulsars (Theoretical Considerations)....Pages 20-62
Observational Evidence for Galactic Spiral Structure....Pages 63-87
Theory of Spiral Structure....Pages 88-121
Front Matter....Pages 123-123
The Apollo Missions....Pages 125-141
Lunar Igneous Activity and Differentiation....Pages 142-154
Seismology of the Moon and Implications on Internal Structure, Origin and Evolution....Pages 155-172
Induced and Permanent Magnetism on the Moon: Structural and Evolutionary Implications....Pages 173-188
Front Matter....Pages 189-189
Opening Remarks....Pages 193-194
Origin of the Solar Nebula....Pages 195-203
Internal Constitution and Thermal Histories of the Terrestrial Planets....Pages 204-227
Internal Constitution of the Giant Planets....Pages 228-238
Open Discussion....Pages 239-243
Opening Remarks at Joint Discussion on the Helium in the Universe....Pages 247-247
Introductory Talk....Pages 248-253
Abundance of Helium in Stellar Atmospheres....Pages 254-268
The Abundance of Helium in Stellar Interiors....Pages 269-287
Abundances of Helium in Gaseous Nebulae....Pages 288-295
Production of Helium by Stellar Evolution....Pages 296-300
Production of Helium in Massive Objects....Pages 301-317
Front Matter....Pages 189-189
Helium Production in the Different Cosmological Models....Pages 318-327
Helium in the Universe: Final Summary....Pages 328-331
Introductory Remarks....Pages 335-335
Interstellar Molecules — The Optical Region....Pages 339-349
Infrared Observations and Interstellar Molecules....Pages 350-358
Microwave Evidence for Interstellar Molecules....Pages 359-365
Molecules in Dense Clouds and Protostars....Pages 366-377
OH as a Constituent of the Interstellar Medium....Pages 378-390
Λ Doublet Radiation from OH Excited Rotational States....Pages 391-393
Interstellar Formaldehyde....Pages 394-401
The Relative Density of H, OH and H 2 CO in Interstellar Clouds....Pages 402-403
NH 3 and H 2 O Emission in our Galaxy....Pages 404-406
Radio Emission from Interstellar Hydrogen Cyanide and X-Ogen....Pages 407-412
Laboratory Studies of the Spectra of Interstellar Molecules....Pages 415-420
Interstellar Molecule Formation; Radiative Association and Exchange Reactions....Pages 421-428
Molecule Formation on Grain Surfaces....Pages 429-431
Photochemistry of Atoms and Molecules in the Adsorbed State....Pages 432-437
Interstellar Molecules from Cool Stars....Pages 438-444
Panel Discussion....Pages 447-459
Final Remarks....Pages 460-462
Front Matter....Pages 189-189
Introduction....Pages 465-465
The Interpretation of Space Observations of Stars and Interstellar Matter....Pages 466-475
The Interpretation of XUV Solar Radiation....Pages 476-485
Some Problems Relating to Solar Line Identification....Pages 486-494
Opacity Sources in the UV Spectrum of the Sun....Pages 495-502
Atomic Data of Importance for Ultra-Violet and X-Ray Astronomy: A Review of Theory....Pages 503-508
Computer Programs for Calculating Atomic Data for Ions....Pages 509-511
Collision Strengths for Electron Excitation of Coronal Ions....Pages 512-517
The Electron Excitation Rate for the Green Coronal Line at 5303 Å....Pages 518-518
The Relative Intensities of Lines from Be i -Like Ions in the Solar Spectrum....Pages 519-526
The Relevance to Astrophysics of the Results of Recent Experiments with Colliding Charged-Particle Beams....Pages 527-536
Results Obtained from Observations of Laboratory Plasmas....Pages 537-543
Relativistic Contributions to Energies of Highly Ionized Atoms....Pages 544-548
Relativistic Corrections to Atomic Energy Levels....Pages 549-554
Magnetic Multipole Transition Probabilities....Pages 555-560
Pressure Broadening of UV Lines....Pages 561-565
New Results on Electron Broadening of some UV Lines of N ii , C ii / iv and Si ii / iii / iv ....Pages 566-574
On the Polarization and Anisotropy of Solar X-Radiation During Flares....Pages 575-579
Summary of the Joint Discussion....Pages 580-583
The Value of Photoelectric Occultation Timings in Lunar Motion Studies....Pages 587-588
Front Matter....Pages 189-189
A Comparative Study of Visual and Photoelectric Timing of Occultations....Pages 589-591
Geodetic Applications of Grazing Occultations....Pages 592-600
The Investigation of Lunar Limb Structure by Means Of Stellar Occultations....Pages 601-606
Optical and Radio Occultation Analysis....Pages 607-621
Seeing Effects on Occultation Curves....Pages 622-623
A Data Acquisition System with On-Line Computer....Pages 624-625
Lunar Occultation Theory and Techniques....Pages 626-635
Photoelectric Observations of Occultations in Japan....Pages 636-637
A Preliminary Analysis of Photoelectric Occultation Measurements....Pages 638-645
The Effects of Filters and Colour on Stellar Occultations and Appropriate Deconvolution Procedures....Pages 646-661
Remarks on the Restoration of Occultation Observations....Pages 662-667
Analysis of Lunar Occultation Data....Pages 668-674
Photometric Observations of the Occultations of Stars by the Moon....Pages 675-687
Some Recent Observations of Occultations by the Moon....Pages 688-691
Angular Diameters of the Red Giants 46 Leo and ø AQR and Parameters of Some Binary Systems from Occultation Observations....Pages 692-699
Photoelectric Occultation Observations of Regulus and the Pleiades....Pages 700-707
Occultation Studies at the Dominion Astrophysical Observatory....Pages 708-712
The Determination of Angular Diameters of Stars....Pages 713-720
Closing Remarks....Pages 721-722
Some Astrophysical Aspects of Pulsars....Pages 725-726
Front Matter....Pages 189-189
Pulsars and the Origin of Cosmic Rays....Pages 727-730
Surface Composition and Cooling Histories of Neutron Stars....Pages 731-736
Remarks on the Role of Pulsars in Cosmic Ray Production....Pages 737-739
Composition and Galactic Confinement of Cosmic Rays....Pages 740-756
The Cosmic Background Radiation: Some Recent Developments....Pages 757-767
Front Matter....Pages 769-769
The Absolute Magnitudes of the RR Lyrae Stars....Pages 771-776
Absolute Magnitudes of RR Lyrae Stars....Pages 777-780
Review of Observational Data on RR Lyrae Stars....Pages 781-787
Absolute Magnitudes of RR Lyrae Variables....Pages 788-789
The Lick Observatory Program on Proper Motions of RR Lyrae Stars....Pages 790-791
General Discussion....Pages 792-793