Birth and evolution of massive stars and stellar groups : proceedings of a symposium held in Dwingeloo, the Netherlands, 24-26 September 1984, in honour of Adriaan Blaauw on the occasion of his 70th birthday

al importance and his outstanding merits as the first -and now retiring -Chairman of ASTRON. Then Maarten Schmidt recalled forty years of friendship and collaboration and, on behalf of participants and friends, presented Blaauw with a portrait painted by Matthijs R•oling (see page 320 of these Proceedings). The Mayor of Norg, Mr. O.G. de Boer, described Blaauw's merits in astronomy as well as in studies of the history of Drenthe, and then announced that Her Majesty the Queen had appointed Adriaan Blaauw Knight of the Order of the Netherlands Lion. -On Tuesday evening, Atie and Adriaan Blaauw entertained participants at their old farmhouse in Zuidvelde, which features an interesting collection of old clocks; and after buffet supper at Hotel Karsten in Norg, the Blaauws offered a chamber music concert in the ancient church at Norg. The present Proceedings were edited from (sometimes) camera-ready manuscripts submitted by participants. Three papers given at the Symposium are unfortunately missing from this volume: "Cometary impacts, molecular clouds, and the Sun's motion perpendicular to the Galactic plane" by P. Thaddeus, "IRAS result s on s tar-f orming regions" by B • Baud, and "Gould's Belt and supershells" by H.F. Weaver (for which an Abstract only was available). For the poster papers, 2-page Abstracts are given. The Discussions following most contributions were written up by participants and speakers, and then edited by us. The papers in Chapter 5 were not followed by discussion. We have illustrated this volume with a number of photographs taken at the Symposium: during the scientific sessions, receptions or meals. These photographs are due to Harmen Meijer (HM) of Dwingeloo Radio Observatory and to Wim Brokaar (WB) of Leiden Observatory; we are grateful for their excellent work. We wish to thank Wim Brouw, Wia Hoogeveen, and Nico de Vries for the local arrangements; Ina van Esch, Wia Hoogeveen and Jeanet Millenaar for their work in the Symposium secretariat; and the Dwingeloo staff for lunches, refreshments and transportation. Various young astronomers from Groningen helped with projection and discussion recording. In our editorial work, we have been ably assisted by Ina van Esch of ASTRON, Ina Greveling of Dwingeloo, and Joke Nunnink of the Kapteyn Institute at Groningen. The meeting was sponsored and supported by ASTRON and RZM. Financial support from the following institutions made it possible to provide a number of key speakers with travel grants: Astronomical Institute, Front Matter....Pages i-xiv Welcoming Address....Pages 1-2 Front Matter....Pages 3-4 The Structure of Star-Forming Regions-The Ages of Subgroups and the Progression of Star Formation....Pages 5-22 The Nearest Molecular Clouds....Pages 23-30 Gould’s Belt and Supershells....Pages 31-32 Distribution and Motion of Young Nearby Stars as a Function of Age....Pages 33-38 Front Matter....Pages 39-40 Observable Consequences of Star Formation in Molecular Clouds....Pages 41-48 Near-Infrared Spectra of 11 T Tauri Stars....Pages 49-54 The Turn-On Point of the Pleiades Cluster....Pages 55-62 Two AOV Stars on the Zero-Age Main-Sequence in the Association Cha I....Pages 63-66 Stellar Associations and the Regions of Active Star Formation in them....Pages 67-78 Evolution of Massive Stars: Observational Evidence....Pages 79-88 Double Stars in Young Stellar Groups....Pages 89-94 Photometric Age Determination of OB-Associations....Pages 95-104 Front Matter....Pages 105-106 Evolution of Binary Stars and the Problem of the Runaway Stars....Pages 107-124 Supernovae and Pulsars....Pages 125-134 The Identification of Massive Supernova Progenitors....Pages 135-152 A Decade of Photometric Monitoring of η Carinae and an Interpretation of its Variability....Pages 153-160 Stellar Evolution in the Magellanic Clouds....Pages 161-166 IRAS Observations of Wolf-Rayet Stars....Pages 167-174 The Role of Convective Overshooting in the Evolution of Intermediate Mass Stars....Pages 175-182 Front Matter....Pages 105-106 The Evolution of Massive Close Binaries with Mass Loss and Overshooting....Pages 183-184 Formation Mechanisms of Various Groups of Luminous Stars....Pages 185-188 The Kinematics of Pulsars....Pages 189-194 Interaction of Supernovae with the Interstellar Medium....Pages 195-200 The Kinematics and Origin of the Runaway O-Type Stars....Pages 201-206 Progenitor Systems of Two Neutron-Star Binaries....Pages 207-210 The Progenitors of the Local Pulsar Population....Pages 211-224 Front Matter....Pages 225-226 Formation of Massive Stars and the Structure of Galaxies....Pages 227-242 Large-Scale Dissociation of Molecular Gas and Star Formation in M83....Pages 243-252 HI Holes in the Interstellar Medium of Messier 31....Pages 253-258 Star Formation in the Magellanic Clouds....Pages 259-268 Magellanic Interstellar Physics and Star Formation....Pages 269-284 The Starburst Phenomenon....Pages 285-290 Oscillations and Bursts in Star-Formation Rates....Pages 291-292 Front Matter....Pages 293-294 Blaauw’s Scientific Work....Pages 295-304 Blaauw and the Cosmic Distance Scale....Pages 305-308 Professor A. Blaauw and the International Astronomical Union....Pages 309-310 Personal Reminiscences of Adriaan Blaauw....Pages 311-314 Blaauw and the European Southern Observatory....Pages 315-320 Adriaan Blaauw and the Revival of Groningen Astronomy....Pages 321-348 Back Matter....Pages 349-377 Adriaan Blaauw; Emeritus Professor of Astronomy at the Universities of Groningen and Leiden, former Directo.r of the Kapteyn Laboratory and of the European Southern Observatory, celebrated his 70th anniversary on 12 April 1984. To mark this event, an international Symposium was con vened on the subject "Birth and Evolution of Massive Stars and Stellar Groups", a subject which has played the leading role in Blaauw's scien tific research. The present volume contains the Scientific Proceedings of that Symposium. The meeting was organized by a Committee consisting of: W.H.W.M. Boland (Secretary), W.N. Brouw, W.B. Burton, E.P.J. van den Heuvel, H. van der Laan and H. van Woerden (Chairman). Together, these six persons represented the Executive Committees of the Netherlands Foundation for Astronomical Research (ASTRON) and the Netherlands Foundation for Radio Astronomy (RZM), two organizations in which Blaauw has held key offices. The scientific program was planned in full consultation with Adri aan Blaauw himself. Only section 5, "A profile of Adriaan Blaauw", was kept secret to him. The other four sections: Structure of star-forming regions, Stellar content of young groups, Evolution of massive stars, and Extragalactic perspective on star formation, each represent an im portant aspect of the overall theme of the Symposium. The program in cluded 6 major review papers, 18 invited papers, 17 contributed papers, some of which were given as posters, and ample time for discussion Proceedings of a Symposium held in Dwingeloo, The Netherlands, September 24-26, 1984 in honour of Adriaan Blaauw on the occasion of his 70th birthday