Wide Components in Double and Multiple Stars : Proceedings of the 97th Colloquium of the International Astronomical Union Held in Brussels, Belgium, 8–13 June, 1987

Proceedings of the 97th Colloquium of the International Astronomical Union, held in Brussels, Belgium, June 8-13, 1987 Front Matter....Pages i-xiv Front Matter....Pages 1-1 Welcome Address....Pages 3-3 General Introductory Lecture....Pages 5-8 Front Matter....Pages 9-9 The Concept of Star Multiplicity and its Historical Evolution....Pages 11-15 Wide Double Stars with Common Proper Motion....Pages 17-19 Wide Pairs in the Washington Double Star Catalogue (WDS)....Pages 21-21 The Contribution of the Hipparcos Mission and of the CCDM Catalogue to the Study of Wide Systems....Pages 23-30 A Photometric Catalogue of Visual and Multiple Stellar Systems....Pages 31-37 A General Catalogue of Ephemerides and Apparent Orbits for Visual Binaries....Pages 39-46 Front Matter....Pages 47-47 The Third Catalogue of Nearby Stars with Special Emphasis on Wide Binaries....Pages 49-56 The Search for Wide Pairs Among Nearby Stars....Pages 57-60 A Plea for Better Astrophysical and Astrometric Data in Case of Double Stars of Peculiar Interest....Pages 61-64 Front Matter....Pages 65-65 Distant Components in Double and Multiple Stars....Pages 67-78 Trapezium-Type Wide Systems....Pages 79-83 The Kinematics of Trapezium-Type Systems....Pages 85-88 A Survey of Third Components in Spectroscopic and Eclipsing Systems....Pages 89-95 Imaging Approach to Multiple Star Recognition: The Algorithm, the Results....Pages 97-97 Physical Parameters of the Massive Multiple System Eta Orionis....Pages 99-101 A Search and Classification of Multiple Systems in the General Field....Pages 103-108 Front Matter....Pages 109-109 Visual Binary Separations as Functions of Primary Types, Ages, and Locations....Pages 111-121 Photoelectric Observations of CPM Stars in the BVRI System....Pages 123-129 Front Matter....Pages 109-109 On the Wide Binaries in Selected Area 57....Pages 131-138 Studies of a Sample of CPM Stars....Pages 139-143 Wide Binaries and Old Disk Population Groups....Pages 145-151 Orbit Determination from a Short Arc through the Coefficients of Power Series in Time....Pages 153-160 Astrometric Parameters of Visual Double Stars Derived from Simulated Hipparcos Measurements....Pages 161-165 Front Matter....Pages 167-167 Tentative Comments about the Meeting....Pages 169-170 The Space Arrangement of the Orbital Planes of the Visual Double Stars....Pages 171-176 A Possible Connection between Wide Binaries and Open Clusters....Pages 177-179 New Orbits of Four Visual Double Stars by the Method of Apparent Motion Parameters (AMP)....Pages 181-183 Are Double Star Observations the Most Suspicious Ones in the Paris Astrolabe Programme ?....Pages 185-189 Visual Double Stars in Professional Spanish Astronomy: Past, Present and Future Projects....Pages 191-193 A Method for Calculating the Orbits of Interferometer/Spectroscopic Binaries from Combined Data....Pages 195-197 The Frequency of Wide Binaries among the Southern Barium Stars....Pages 199-201 Observation et Resolution du Systeme Triple η Virginis par la Methode des Occultations....Pages 203-206 The Researches at Torino on Wide Double Stars....Pages 207-210 Precise Radial Velocity Measurements of Visual Binary Stars....Pages 211-212 Mesures Photographiques D’Etoiles Doubles Visuelles Larges....Pages 213-214 Positions Precises D’etoiles Doubles Visuelles Larges....Pages 215-216 Software for Calculating Orbit and Mass of Visual Binaries....Pages 217-221 VRI Photometry of Late Dwarf Common Proper Motion Stars....Pages 223-225 Front Matter....Pages 167-167 CCD Suitable for Double Star Astrometry....Pages 227-230 Infrared Companions to Pre-Main Sequence Stars....Pages 231-231 Dynamical Evolution of Triple Systems (Scientific film)....Pages 233-233 Front Matter....Pages 235-235 Statistical Studies on Wide Pairs....Pages 237-244 Statistical Study of Visual Binaries....Pages 245-254 The Optical Fraction of a Hipparcos Sample of Wide Binaries....Pages 255-258 Wide Binaries in a Hipparcos Sample Centered Around b = 0°, l = 300°....Pages 259-264 Front Matter....Pages 265-265 Theoretical Models for Wide Binary Evolution....Pages 267-276 How we can Learn from Studies of Wide Binary Statistics....Pages 277-287 Evidence for Mass Loss in Visual Binary Stars....Pages 289-304 Concluding Remarks....Pages 305-310 Erratum....Pages 311-311