Spectral classification and multicolour photometry : symposium no. 50 held in Villa Carlos Paz, Argentina, October 18-24, 1971

Dr J. Landi Dessy, Director of the Astronomical Observatory, Cordoba, Argentina, invited the International Astronomical Union to hold a Symposium in Cordoba in connection with the celebration of the Centennial of the Cordoba Observatory; the date of foundation is October 24, 1871. He proposed that the Symposium should deal with Spectral Classification and Multicolour Photometry as seven years had elapsed since the Symposium No. 24 in Saltsj6baden, and much development had occurred in the field. The invitation and the proposal were accepted by the IAU, and the Symposium was held in Villa Carlos Paz, near Cordoba, between October 18 and October 24, 1971. It was attended by about 50 scientists representing Argentina, Canada, Chile, Den­ mark, France, Germany, Italy, Mexico, Sweden, Switzerland, U.K., U.S.A., Vatican City State and Venezuela. The Symposium was divided into four sessions: 1. Classification of slit spectra, 2. Classification of objective-prism spectra, 3. Photometric classification, 4. Catalogues and documentation. It was decided not to include problems of calibration of absolute magnitudes and temperatures of stars but to refer this to a separate symposium. The contents of the present volume follow closely the programmes of the individual sessions of the Symposium. All the participants at the Symposium appreciated the excellent hospitality of their Argentinian hosts and the efficient help given by the staff ofthe Cordoba Observatory. Front Matter....Pages i-xiv Front Matter....Pages 1-1 The Role of Classification of Slit Spectrograms....Pages 3-12 Spectroscopic Criteria for the Classification of Peculiar B-Type Stars with Colour-Spectrum Discrepancies....Pages 13-16 Classification des Étoiles B À Partir des Raies de L’Hydrogéne—Comparaison AVEC D’Autres Classifications....Pages 17-20 Étude des Étoiles Supergéantes du Grand Nuage de Magellan, Leurs Magnitudes Absolues et Couleurs....Pages 21-26 Quantitative Spectral Classification in the BCD System for LMC Supergiants....Pages 27-28 Photometric Investigation of IC 2944....Pages 29-29 Spectral Classification Studies of Cepheids using a Small Telescope with an Image Tube Spectrograph....Pages 30-32 Spectral Classification of Some Long-Period and Semiregular Variables Near Times of Maximum....Pages 33-35 Some Notes on Stars Near K0....Pages 36-41 Spectroscopic Observations of the Sanduleak-Seggewiss Stars in NGC 6231....Pages 42-42 On the Precision of the MK Spectral Classification System....Pages 43-51 On the Accuracy of Spectral Classifications of Main-Sequence Stars....Pages 52-59 Advantages and Limitations of Quantitative Spectral Classification....Pages 60-61 Front Matter....Pages 63-63 Introductory Talk for Session on Objective Prism Spectral Classification....Pages 65-69 Two-Dimensional Classification of the HD Stars....Pages 70-76 Early Results from the Michigan Southern-Hemisphere Spectral Survey....Pages 77-79 The Bonn Spectral Atlas: Part II....Pages 80-81 The Present State of a Spectral Survey of the Southern Milky Way for Stars Earlier than A5....Pages 82-84 Objective Prism Spectral Classification at the Stockholm Observatory....Pages 85-90 The Peculiar Stars and Spectral Classification....Pages 91-94 Front Matter....Pages 63-63 Spectrophotometry of M and C Stars....Pages 95-95 The Spectral Classification of Southern Carbon Stars....Pages 96-108 Automatic Classification of Objective Prism Spectra....Pages 109-124 Microphotometry-Computer Classification of Objective-Prism Spectra....Pages 125-126 Blue-Infrared Narrow-Band Photometry from Objective Prism Spectra....Pages 127-133 Preliminary Investigation of Quantitative Spectral Classification by Means of Objective-Prism Spectra Obtained with the Broerfelde Schmidt Telescope....Pages 134-137 Front Matter....Pages 139-139 General Remarks on Quantitative Spectral Classification....Pages 141-144 Applications of the UB 1 B 2 V 1 G Photometric System....Pages 145-151 Classification of Early Type Stars on the Dominion Astrophysical Observatory Photometric System....Pages 152-161 The David Dunlap Observatory (DDO) Photometric System for Classification of Late-Type Stars....Pages 162-175 Results from Three Dimensional Spectral Classification of Population II Stars Using the DDO Photometric System....Pages 176-182 Photometric Classification of Stars in the Vilnius Observatory....Pages 183-185 Photometric Classification of B-Type Stars....Pages 186-191 Multicolor Photometry of the Galactic Cluster NGC 2362....Pages 192-201 Photoelectric Measures of H α , H β and H γ in Early-Type Stars....Pages 202-207 Narrow Band Photometry of Supergiant Stars....Pages 208-208 New Standards for the Spectral Classification of M Dwarfs....Pages 209-219 The Identification of T Tauri-Like Stars by Multicolour Photometry....Pages 220-225 Classification of Population II Stars in the RGU System....Pages 226-229 Photometric Classification of Blue Horizontal-Branch Stars....Pages 230-244 Front Matter....Pages 139-139 Some Blue Stars of Peculiar Type in the Region of the South Galactic Pole....Pages 245-250 Quelques Sous-Naines Dans la Direction du Grand Nuage de Magellan....Pages 251-257 Two Dimensional Spectral Classification of Early Type Stars by Low Dispersion Spectrophotometry....Pages 258-266 Low Dispersion Spectrophotometry of Late Type Stars....Pages 267-271 Front Matter....Pages 273-273 Information and Catalogues....Pages 275-284 Photometric Data in Machine-Readable Form....Pages 285-287 Remark in Regard to Bidelman’s Data-Bank Project....Pages 288-288 The Southern Objective Prism Survey....Pages 289-289 A Method for Determining Radial Velocities from Objective Prism Plates....Pages 290-292 Spectral and UBV Data for 583 Stars (Supergiants and Foreground Stars) in the Direction of the Large Magellanic Cloud....Pages 293-294 A Study of Interstellar Reddening at High Galactic Latitudes....Pages 295-301 The Construction and Documentation of the Celescope Catalog....Pages 302-314