Planetary Nebulae: Proceedings of the 131st Symposium of the International Astronomical Union, Held in Mexico City, Mexico, October 5–9, 1987 (International Astronomical Union Symposia, 131)

Every 5 years since 1967 a meeting has been held to discuss the subject of planetary nebulae and their central stars. Previous meetings have been held in Tatranska Lomnica (Czechoslovakia); Liege (Belgium); Ithaca, New York (U. S. A); and London (Great Britain). IAU Symposium 131 was sponsored by IAU Commision 34, on Interstellar Matter and co-sponsored by IAU Commisions 35 and 36 on Stellar Constitution and Theory of Stellar Atmospheres. The symposium was held at the Universidad Nacional Autonoma de Mexico in Mexico City, October 5-9, 1987. It took place in one of the old buildings of the University of Mexico in the downtown area. The inner patio of the building provided very pleasant surroundings for the poster sessions and for extensive discussions among the participants. The meeting was attended by 160 scientists from 22 countries. The Scientific Organizing Committee,under the chairmanship of J.B. Kaler, prepared a comprehensive scientific program based on a set of invited presentations. All contributed papers were presented in poster form. The Scientific Organizing Committee would like to thank the staff of the University of Illinois Department of Astronomy: Dr. Ron Allen for granting financial support; Carol Stickrod, Louise Browning, Deana Griffin and Sandie Osterbur for their help with the organization. IAU provided economic assistance to a group of young astronomers. Front Matter....Pages i-xx Recent UV and Optical Observations of Planetary Nebulae....Pages 1-8 Infrared Observations of Galactic Planetary Nebulae....Pages 9-16 Radio Images of Planetary Nebulae....Pages 17-28 New and Misclassified Planetary Nebulae....Pages 29-37 Catalogues of Planetary Nebulae....Pages 39-48 Narrow Band Photometry and Mapping of the Planetary Nebulae NGC 6210 and NGC 7009....Pages 49-49 New Observations of Planetary Nebulae S22 and YM29....Pages 50-50 Two Southern Low Excitation Planetary Nebulae....Pages 51-51 Spectroscopic Survey of Planetary Nebulae....Pages 52-52 The Probable Low Excitation Planetary Nebula M3-44....Pages 53-53 Optical and Infrared Observations of the Peculiar Planetary Nebula HE2-442....Pages 54-54 The Photometric (UBV) Study of the Planetary Nebulae Variability in 1968–1987....Pages 55-55 The Photometric and Spectral Variability of the Planetary Nebula IC 4997....Pages 56-56 Planetary Nebula He 2–467 Turned out to be the Symbiotic Star with a Period about 500 Days....Pages 57-57 Infrared Energy Distribution of Selected Planetary Nebulae....Pages 57-57 Near Infrared Photometry of Compact Planetary Nebulae....Pages 58-58 The Near Infrared Spectrum of NGC7027....Pages 59-59 A VLA Radio Continuum Survey of Planetary Nebulae....Pages 60-60 A New Planetary Nebula....Pages 61-61 Is NGC 22142 a New Planetary Nebula?....Pages 62-62 Planetary Nebulae Near the Galactic Center I: Method of Discovery and Preliminary Results....Pages 63-63 An Infrared Search for New Planetary Nebulae....Pages 63-64 Distances to Planetary Nebulae....Pages 65-72 Galactic Distribution, Radial Velocities and Masses of PN....Pages 73-82 The Shapes and Shaping of Planetary Nebulae....Pages 83-92 Expansion Velocities and Characteristics of Galactic Planetary Nebulae....Pages 93-104 Multiple Shell Planetary Nebulae....Pages 105-116 Dust in Planetary Nebulae....Pages 117-128 Molecules and Neutral Hydrogen in Planetary Nebulae....Pages 129-138 Abundances in Planetary Nebulae....Pages 139-156 Photoionization Models....Pages 157-166 Planetary Nebulae and the Galactic Bulge....Pages 167-167 Spectroscopic Distances to Central Stars of Planetary Nebulae....Pages 168-168 Investigation of Two Planetary Nebulae and Their Angular Vicinity in Cygnus....Pages 168-168 Structure and Morphology of NGC6369....Pages 169-169 H 2 and H I Emission Line Imaging of the Ring Nebula NGC 6720....Pages 170-170 Deep Narrow Band Interference Filter Photographs of Selected Extended Planetary Nebulae....Pages 171-171 CCD Images of Selected Planetary Nebulae....Pages 172-172 CCD Images of Southern Hemisphere Planetary Nebulae....Pages 173-173 IRAS observations of extended planetary nebulae....Pages 174-174 Nebular Density Distributions; A Critical Look....Pages 175-175 The Temperature Structure of NGC 7027....Pages 176-176 The Display and Manipulation of PN images on an IBM PC or Compatible....Pages 177-177 Infrared Images and Line Profiles of Planetary Nebulae....Pages 178-178 NGC 2899: An Evolved Bipolar Planetary Nebula....Pages 179-179 The Structure and Kinematics of Bipolar Planetary Nebulae....Pages 180-180 Collimated Outflows in Planetary Nebulae....Pages 181-181 Kinematical Properties of Planetary Nebulae....Pages 182-182 Kinematics of Abell 30....Pages 183-183 High Resolution Long-Slit Spectroscopy of A78....Pages 184-184 The Structure and Velocity Field of A78....Pages 185-185 Spatial Deconvolution of IRAS Observations of Planetaries....Pages 186-186 Evidence of Expansion in the Central Region of NGC 2346....Pages 187-187 Unusual Emission Line Profiles of M1-1....Pages 188-188 Emission Line Profiles in the Planetary Nebulae IC 4593 and NGC 6153....Pages 189-189 A New Study of Some Galactic Planetary Nebulae....Pages 189-189 Expansion Velocities of [NII] and [OIII] from Compact Planetary Nebulae....Pages 190-190 High and Low Resolution Spectra of Selected Planetary Nebulae....Pages 191-191 The Planetary ESO 166 — PN21....Pages 192-192 The Structure of NGC 2392....Pages 193-193 High Velocity Outflows in Post-Main Sequence Nebulae....Pages 194-194 Long-Slit 2-Dimensional Spectra of the Giant Halos around NGC 6543 and NGC 6826.....Pages 195-195 The Halos of NGC 6543 and NGC 6826....Pages 196-196 Expansion Velocities of Southern Planetary Nebulae....Pages 196-196 Detection of an Extended Optical Halo around IC 418....Pages 197-197 Internal Motions of Faint PN Halos....Pages 198-198 Spectroscopic Investigations of Halos of Planetary Nebulae....Pages 199-199 Kinematic Structure and Chemical Composition of the Double Shell PN NGC 3242....Pages 200-200 Thermal Infrared Emission by Dust in the Planetary Nebula NGC 3918....Pages 201-201 The Dust Content of Planetary Nebulae with Neutral Halos....Pages 202-202 Spatially Resolved Observations of the Unidentified Dust Features in BD +30°3639....Pages 203-203 Observations of CO and HCN (J = 1-0) in NGC 2346 and NGC 7293 with the Nobeyama 45-m Telescope....Pages 204-204 A Young Planetary Nebula with OH Molecules: NGC 6302....Pages 205-205 CO in the Bipolar Nebula NGC 2346....Pages 205-205 Fluorescent H 2 Emission in the Planetary Nebulae BD+30 3639 and HB 12....Pages 206-206 Molecular Hydrogen Emission from Cold Condensations in NGC 2440....Pages 207-207 The Systematics and Distribution of Molecular Hydrogen in Planetary Nebulae.....Pages 208-208 Detection of OH Maser Emission at 1667 MHZ from IC 4997....Pages 209-209 OH Maser Emission from Young Planetary Nebulae....Pages 210-210 Helium Abundances in Gaseous Nebulae....Pages 211-211 Collisional Excitation of the 10830 He I Line and the Population of the 2 3 S He I State in Gaseous Nebulae....Pages 212-212 Planetary Nebulae and the Pregalactic Helium Abundance....Pages 213-213 N/O Abundances in Planetary Nebulae from Far-Infrared Line Observations....Pages 214-214 Investigations of DDDM 1; the Fourth Halo Planetary Nebula....Pages 215-215 The Peculiar Planetary Nebula M1-78....Pages 216-216 Oxygen Depletion Variations in Planetary Nebulae and Shells Ejected from Luminous Population I Stars....Pages 216-216 Magnesium Abundances in Planetary Nebulae and Interstellar Absorption of Mg II λ2800 A....Pages 217-217 Abundances of C, N and O in Planetary Nebulae....Pages 218-218 Some Statistics of Nebular Chemical Compositions....Pages 219-219 Electron Densities in Planetary Nebulae....Pages 220-220 Low Resolution Spectroscopy of 13 Low Surface Brightness PN’s....Pages 220-220 Effect of Density Variations on Elemental Abundance Determinations in Gaseous Nebulae....Pages 221-221 A Possible Subdivision of Type II Planetary Nebulae....Pages 222-222 Observations and Models of the ‘Helix’ Nebula NGC 7293....Pages 223-223 A Photoionization Model Study of NGC 7027....Pages 224-224 Emission Lines of CI and N II in Planetary Nebulae....Pages 225-225 The Continuum Emission from Planetary Nebulae....Pages 226-226 Comparison of Different Treatments of the Radiation Transfer in Model Calculations of Planetary Nebulae....Pages 227-227 The Spatial Distribution of Line Ratio O III/O II in High Excitation Planetary Nebulae....Pages 228-228 Magnitudes, Spectra, and Temperatures of Planetary Nuclei....Pages 229-240 Wind Features and Wind Velocities....Pages 241-250 Close-Binary and Pulsating Central Stars....Pages 251-260 Binarity and Intrinsic Variability in Central Stars of PN....Pages 261-272 Model Atmospheres and Quantitative Spectroscopy of Central Stars of Planetary Nebulae....Pages 273-292 Mass Loss Rates in Central Stars of Planetary Nebulae....Pages 293-300 The Central Star of NGC 7027....Pages 301-301 Magnitude Measurements of Central Stars of Planetary Nebulae....Pages 302-302 Stromgren Photometry of the Central Stars of Planetary Nebulae....Pages 302-302 New Identifications of Faint Central Stars in Extended PN....Pages 303-303 Einstein X-Ray Observations of Planetary Nebulae and their Implications....Pages 304-304 The Origin of the Zanstra Discrepancy: UV Excess in the Central Star Continuum?....Pages 305-305 Are Zanstra Temperatures Always Real?....Pages 306-306 Temperatures and Luminosities of Planetary Nebulae Nuclei....Pages 307-307 Broad Baseline Flux Distribution of Planetary Nuclei....Pages 308-308 Photometric and Spectroscopy Observations of Peculiar Nuclei of Planetary Nebulae....Pages 309-309 HFG1: A Planetary Nebula with a Close-Binary Nucleus....Pages 310-310 Nonradial Pulsational Analyses of the Pulsating Central Stars of Planetary Nebulae....Pages 311-311 A Search for Cool Companions of Planetary Nebula Nuclei....Pages 312-312 A Case Study of a WC Nucleus....Pages 313-313 The Nature of the Hot Companion of the G8 IV Nucleus of Abell 35....Pages 314-314 V605 Aquilae — The Most Extreme Hydrogen-Poor Object....Pages 315-315 Echelle Spectra of a Large Sample of Planetary Nebula Nuclei....Pages 316-316 The Metal-Line Spectra of Central Stars of Planetary Nebulae....Pages 317-317 Revisited Mass-Loss Rates of Planetary Nebula Nuclei Observed with IUE....Pages 317-317 Quantitative Investigations on Mass Outflow from Planetary Nebulae Nuclei....Pages 318-318 Planetary Nebulae in the Magellanic Clouds....Pages 319-334 Planetary Nebulae in Galaxies Beyond the Local Group....Pages 335-350 A Survey of Planetary Nebulae in the SMC and M31....Pages 351-351 The Kinematics of the Planetary Nebulae in the Large Magellanic Cloud....Pages 352-352 N 66: A High Excitation N Rich Planetary Nebula in the LMC....Pages 353-353 Chemical Abundances in Magellanic Cloud Planetary Nebulae....Pages 354-354 Central Star and Nebular Hasses for Magellanic Cloud Planetary Nebulae....Pages 355-355 Evolution of Magellanic Cloud Planetary Nebulae....Pages 356-356 Planetary Nebulae as Standard Candles for Extragalactic Distances....Pages 357-358 OH/IR Stars and Other IRAS Point Sources as Progenitors of Planetary Nebulae....Pages 359-380 Carbon Stars as Planetary Nebula Progenitors....Pages 381-390 Thermal Pulses and the Formation of Planetary Nebula Shells....Pages 391-400 Progenitors of Planetary Nebulae....Pages 401-410 Models of Planetary Nebulae: Generalisation of the Multiple Winds Model....Pages 411-424 Stellar Evolution and the Planetary Nebula Formation Rate....Pages 425-442 The Proto-Planetary Nebula Vy 2-2.....Pages 443-443 The Optically Resolved Planetary Nebula/OH Maser Vy 2-2....Pages 444-444 New IR-Observations of Post AGB Stars and Proto-Planetary Nebulae....Pages 445-445 IRAS 17516–2525: The Birth of a Planetary Nebula?....Pages 446-446 The Shocking Truth About Some “Proto-PN”....Pages 447-447 New OH/IR Stars: Proto-Planetary Nebulae?....Pages 448-448 Infrared Photometry of OH/IR Stars....Pages 449-449 The Presence of Water Masers in Color-Selected IRAS Sources....Pages 450-450 Some Dependences for Long-Period Variables and a Possible Scheme of Their Evolution....Pages 451-451 Proto-Planetary Nebulae: Models and Iras Observations....Pages 452-452 HCN, the First Strong Maser in Carbon-Rich Stars....Pages 453-453 Lower Limit for NPN’s Masses....Pages 454-454 Some Hypothesized Observational Aspects of Magnetic Fields in Protoplanetary Nebulae....Pages 455-455 Stalled Winds: Interactions Between Nebulae and Stellar Winds....Pages 456-456 Optically Thick Wind from Post-AGB Stars and Formation of Planetary Nebulae....Pages 457-457 Direct Evidence for a Bipolar Stellar Wind in NGC 2392....Pages 458-458 Two-Dimensional Hydrodynamical Models of Planetary Nebulae (PNe)....Pages 459-459 The Spatial Structure of Planetary Nebulae with Binary Central Stars....Pages 460-460 Morphologies of Planetary Nebulae with Close-Binary Nuclei....Pages 461-461 CCD Images of Three Planetary Nebulae With Binary Nuclei....Pages 462-462 Evolutionary Tracks for Central Stars of Planetary Nebulae....Pages 463-472 The Distribution of Planetary Nebula Nuclei in the Log L-Log T Plane: Inferences from Theory....Pages 473-480 The Position of the Central Stars of PN on the HR Diagram....Pages 481-492 Initial Masses....Pages 493-504 Binary Stars and Planetary Nebulae....Pages 505-522 The Evolution of the Common Planetary Nebula....Pages 523-530 Planetary Nebulae with Massive Central Stars....Pages 531-538 A New Method for Observational Testing of the Planetary Nebulae Nuclei Evolution....Pages 539-539 Mass Distribution and Birth Rate of Central Stars of Planetary Nebulae: Comparison with White Dwarfs, and Influence of Selection Effects....Pages 540-540 Common Envelope Evolutions of Binary System and Formation of Planetary Nebulae....Pages 541-541 Theoretical Models for the Evolution of Planetary Nebulae Nuclei Tested by Observations....Pages 542-542 Snapshots of Evolving Model Planetary Nebulae....Pages 542-542 Evolution of Planetary Nebulae: A Comparison with Observed Central Stars....Pages 543-544 White Dwarfs and Planetary Central Stars....Pages 545-554 Properties and Evolution of White Dwarf Stars....Pages 555-566 Summarizing Remarks on the Structure and Evolution of Planetary Nebulae and Properties of Their Central Stars....Pages 567-576 Comments on the Applications of Planetary Nebulae Research....Pages 577-587 Back Matter....Pages 589-607 Every 5 years since 1967 a meeting has been held to discuss the subject of planetary nebulae and their central stars. Previous meetings have been held in Tatranska Lomnica (Czechoslovakia); Liege (Belgium); Ithaca, New York (U.S.A); and London (Great Britain). IAU Symposium 131 was sponsored by IAU Commision 34, on Interstellar Matter and co-sponsored by IAU Commisions 35 and 36 on Stellar Constitution and Theory of Stellar Atmospheres. The symposium was held at the Universidad Nacional Autonoma de Mexico in Mexico City, October 5-9, 1987. It took place in one of the old buildings of the University of Mexico in the downtown area. The inner patio of the building provided very pleasant surroundings for the poster sessions and for extensive discussions among the participants. The meeting was attended by 160 scientists from 22 countries. The Scientific Organizing Committee, under the chairmanship of J.B. Kaler, prepared a comprehensive scientific program based on a set of invited presentations. All contributed papers were presented in poster form. The Scientific Organizing Committee would like to thank the staff of the University of Illinois Department of Astronomy: Dr. Ron Allen for granting financial support; Carol Stickrod, Louise Browning, Deana Griffin and Sandie Osterbur for their help with the organization. IAU provided economic assistance to a group of young astronomers