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A sociacion AJrgent ina de ~A\st ronomia Boletín N° 46 La Plata, Buenos Aires, 2003 AsociaciónArgentina, de Astronomía - Boletín 46 i Asociación Argentina de Astronomía Reunión Anual La Plata, Buenos Aires, 22 al 25 de septiembre Organizada por: Facultad de Ciencias Astronómicas y Geofísicas Universidad Nacional de La Plata EDITORES Stella Maris Malaroda Silvia Mabel Galliani 2003 ISSN 0571^3285 AsociaciónArgentina, de Astronomía - Boletín 46 íi Asociación Argentina de Astronomía Fundada en 1958 Personería Jurídica 1421, Prov. de Buenos Aires Asociación Argentina de Astronomía - Boletín 46 iii Comisión Directiva Presidente: Dra. Marta Rovira Vicepresidente: Dr. Diego García Lambas Secretario: Dr. Andrés Piatti Tesorero: Dra. Cristina Cappa Vocal 1: Dr. Sergio Cellone Vocal 2: Dra. Lilia Patricia Bassino Vocal Sup. 1: Dra. Zulema González de López García Vocal Sup. 2: Lie. David Merlo Comisión Revisora de Cuentas Titulares: Dra. Mirta Mosconi Dra. Elsa Giacani Dra. Stella Malaroda Suplentes: Dra. Irene Vega Comité Nacional de Astronomía Secretario: Dr. Adrián Brunini Miembros: Dr. Diego García Lambas Dra. Olga Inés Pintado Lie. Roberto Claudio Gamen Lie. Guillermo Federico Hágele Asociación Argentina de Astronomía - Boletín 46 IV Comité Científico de la Reunión Dr. Roberto Aquilano Dr. Adrián Brunini Dr. Juan José Clariá Dra. Cristina Cappa Dr. Juan Carlos Forte (Presidente) Dr. Daniel Gómez Lie. Carlos López Dra. Stella Malaroda Dra. Mirta Mosconi Comité Organizador Local Lie. María Laura Arias Dr. Pablo Cincotta (Presidente) Lie. Roberto Gamen Dra. Ana María Orsatti Lie. Roberto Venero Asociación Argentina de Astronomía Boletín 46 v REUNIÓN DEDICADA A LA MEMORIA DE LA DRA. MIRLA MOSCONI 2/5/1954 4/5/2003 Asociación Argentina de Astronomía - Boletín 46 vi INSTITUCIONES PARTICIPANTES ATNF, Australia Telescope National Facility, CSIRO, Australia AURA, Association of Universities for Research in Astronomy, EEUU Astronomical Institute, University of Amsterdam, Holanda Agencia Córdoba Ciencia S.A., Argentina Agencia Nacional de Promoción Científica, Argentina Area de Patrimonio Cultural, Municipalidad de Córdoba, Argentina CUA, The Catholic University of America/NASA, GSFC, EEUU CASLEO, Complejo Astronómico El Leoncito, San Juan, Argentina CIC, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Argentina CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina CTIO, Cerro Tololo Interamerican Observatory, Chile Cornell University, New York, EEUU CSIRO, Commonwealth Scientific k, Industrial Research Organisation, Australia CNEA, Centro Atómico Constituyentes, Argentina Departamento de Física, UBA, Argentina Department of Physics, The Citadel, Charleston, SC, EEUU Departamento de Física, Facultad de Ciencias Exactas de Tucumán, UNT, Argentina Department of Physics, University of Durham, Inglaterra Department de Matemática Aplicada i Analisi, Universitat de Barcelona, España Department de Physique et Observatoire du Mont Megantic, Universite Laval, Ste-Foy, Canadá Departamento de Astronomia, Universita di Padova, Italia Departamento de Física y Astronomía, University of Johns Hopkins, EEUU Departamento de Física, Universidad de La Serena, Chile Departamento de Astronomía, Universidad de Chile, Chile Departament für Astronomie der Universitat Wien, Austria Departamento de Física, Universidad de Concepción, Chile Department of Astronomy, Cornell University, EEUU ESO, European Southern Observatory, Chile ESA, European Southern Agency FACET, Facultad de Ciencias Exactas de Tucumán, Argentina FCAG, Facultad de Ciencias Astronómicas y Geofísicas de La Plata, Argentina FAMAF, Facultad de Matemáticas, Astromomía y Física de Córdoba, Argentina Facultad Regional de San Nicolás, Argentina Grupo ATEL, Córdoba, Argentina George Mason University, Fairfax, EEUU Grupo de Estudios Ambientales de San Nicolás, Argentina Goddard Space Flight Center, NASA, EEUU Harvard-Smithsonian Center for Astrophysics, Cambridge, EEUU IAFE, Instituto de Astronomía y Física del Espacio (CONICET-UBA), Argentina Instituto de Astronomía, Geofísica y Ciencias Atmosféricas, Brasil Instituí d’Astrophysique de Paris, Francia IALP, Instituto de Astrofísica de La Plata, Argentina IAR, Instituto Argentino de Radioastronomía, CONICET, Argentina IAS, Instituí d’Astrophysique Spatiale, Orsay, Francia IATE, Grupo de Investigaciones en Astronomía Teórica y Experimental, OAC, Argentina Asociación Argentina de Astronomía - Boletín 46 vii IDA, International Dark-Sky Association IPS, Instituto Politécnico Superior “Gral. San Martín”, UNR, Argentina Instituto de Física de Rosario, (CONICET-UNR), Argentina Institute for Advanced Study, Princeton, EEUU Instituí of Astronomy, Cambridge, Inglaterra Instituto de Astronomía de la Universidad de Lausanne, Suiza Instituto de Astrofísica de Canarias, España Instituto de Astronomía, Tolioku University, AOBA, Sandai, Japón Instituto de Física, Universidad Federal de Rio Grande do Sul, Porto Alegre, Brasil Konkoly Observatory, Hungría LAOMP, Laboratoire d’Astrophysique, Observatoire Midi-Pirenees, Tolouse, Francia Laboratorio Tandar, Argentina LAOG, Laboratoire d’Astrophysique de l’Observatoire de Grenoble, Francia Mullard Space Science Laboratory, University College, London, Inglaterra NOAO, National Optical Astronomy Observatory, EEUU NRAO, National Radio Astronomy Observatory, New Mexico, EEUU NRL, Naval Research Laboratory, Washington, EEUU OAC, Observatorio Astronómico de Córdoba, Argentina OAFA, Observatorio Astronómico “Félix Aguilar”, San Juan, Argentina OAMR, Observatorio Astronómico Municipal de Rosario, Argentina ON, Observatorio Naval de Buenos Aires, Argentina Observatorio Las Campanas, Chile Observatoire de Paris, Meudon, Francia Observatoire Royal de Belgique, Bruselas, Bélgica Osservatorio Astronómico di Brera, Italia OAMP, Observatoire Astronomique, Marseille, Provence, Francia Observatorio Astronómico de Grenoble, Francia School of Physics, University of Sydney, Australia SeCyT, Secretaría de Ciencia y Tecnología, Universidad Nacional de Córdoba, Argentina SRON National Institute for Space Research, Utrech, Holanda STScl, Space Telescope Science Institute, EEUU Servicio de Hidrografía Naval, Argentina Secretaria de Post Grado, UNC, Argentina Telescopio Nazionale Galileo, La Palma, Islas Canarias, España Tohoku University, Japón UBA, Universidad de Buenos Aires, Argentina UC, Universidad de Chile, Chile UFRGS, Universidade Federal do Rio Grande do Sul, Brasil UNC, Universidad Nacional de Córdoba, Argentina UNLP, Universidad Nacional de La Plata, Argentina UNT, Universidad Nacional de Tucumán, Argentina UTN, Universidad Tecnológica Nacional de San Nicolás, Argentina Universidad de Sydney, Australia Universite de Montreal, Canadá Universidad de La Serena, Chile Universidad de Concepción, Chile Universidad de Lausanne, Suiza Asociación Argentina de Astronomía - Boletín 46 viii Universita di Padova, Italia Universidad Nacional de San Juan, Argentina Universidad de Sao Paulo, Brasil Universitát Wien, Austria University of Durkliam, Inglaterra University of Johns Hopkins, Baltimore, EEUU Universidad de Mar del Plata, Argentina Yunnan Observatory, China Zentral Informatikdienst der Universitát Wien, Austria Asociación Argentina de Astronomía - Boletín 46 ix INDICE GENERAL PREFACIO S. Malaroda& S. Galliani x The mystery of Coronal Loops J.A. Klimchuk 2 Los arcos coronales y la estructura magnética de la corona solar M.C. López Fuentes & J.A. Klimchuk 2 Sobre el ciclo de actividad solar y el mínimo de Maunder P.D. Mininni & D. Gómez 3 The large scale magnetic helicity content of the interplanetary magnetic cloud of October 18-19, 1995 S. Dasso, C.H. Mandrini, P. Démoulin & M.L. Luoni 3 How to test coronal heating models? C.H. Mandrini, P. Démoulin, L. van Dried -Gesztelyi, J.A. Klimchuk & L.K. Harm 5 Comportamiento de la cromosfera solar en la línea H-alfa durante el período enero de 1999 - junio de 2003 R. Aquilano, D. Dávoli, H. Missio & S. Acero 6 Variación espacial y temporal en la intensidad de la línea de Fe XIV (530,3 nm) a lo largo de loops coronales A. Borgazzi, A. Costa & G. Stenborg 6 Modelo semi^empírico de protuberancia solar a partir del diagnóstico de densidades í). Cirigliano, J.C. Vial & M. Rovira 7 Why to determine the magnetic helicity in corona and interplanetary medium? M.L. Luoni, S. Dasso, C.H. Mandrini, L. van Dried Gesztelyi & P. Démoulin 8 En la búsqueda de características en eyecciones coronales de masa que discriminen entre dos paradigmas físicos en modelos de ECMs G. Paissan, G. Stenborg & M. Rovira 9 Abundancia de Oxígeno en la Corona Solar A.M. Vásquez & J.C. Raymond 9 Dinámica de planetas extrasolares resonantes C. Beauge 11 Contribución de los Hildas a la población de cometas R.P. Di Sisto, A. Brunini, L.D. Dirani & R.B. Orellana 11 Asociación Argentina de Astronomía - Boletín 46 x Formación y evolución de planetas gigantes O.G. Benvenuto & A. Brunini 12 Distribución espacial de órbitas con diferentes grados de caoticidad en modelos autoconsistentes de satélites galácticos J.C. Muzzio & M. Mosquera 12 Primeras simulaciones de formación planetaria con interacción planeta^disco R.G. Cionco & A. Brunini 13 Efectos relativistas en planetas con pequeño semieje orbital í). Giuliodori, S. Fernández & M. Nicotra 13 Estudios astrogeodinámicos de la rotación terrestre A.M. Pacheco, E. Alonso, R. Podestá & E. Actis 15 Estudios astrogeodinámicos de variaciones de Latitud A.M. Pacheco, E. Alonso, R. Podestá & E. Actis 15 Órbitas rápidas de transferencia Sol—Júpiter en el
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  • The Star Newsletter

    The Star Newsletter

    THE HOT STAR NEWSLETTER ? An electronic publication dedicated to A, B, O, Of, LBV and Wolf-Rayet stars and related phenomena in galaxies No. 41 June/July 1998 editor: Philippe Eenens http://www.astro.ugto.mx/∼eenens/hot/ [email protected] http://www.star.ucl.ac.uk/∼hsn/index.html Contents of this newsletter From the Editor . 1 Abstracts of 24 accepted papers . 2 Abstracts of 2 submitted paper . 16 Abstracts of 2 proceedings papers . 17 Book ......................................................................18 Meetings ...................................................................20 From the editor This issue covers two months of publications and is dominated by η Car, other LBVs and B[e] stars. Other papers tell us about massive stars in the Galactic Center and R136, OB stars, polarimetry, wind models and [WC] central stars of Planetary Nebulae. We also present a book and remind readers about future meetings: two special sessions during IAU symposium 193 in Mexico (on HD5980 and on the XMEGA campaign) as well as IAU colloquium 175 in Spain in June 1999 (on Be stars). 1 Accepted Papers On the Multiplicity of η Carinae Henny J.G.L.M. Lamers1,2, Mario Livio1, Nino Panagia1,3, & Nolan R. Walborn1 1 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 2 Astronomical Institute and SRON Laboratory for Space Research, Princetonplein 2, 3584CC Utrecht, The Netherlands 3 On assignment from the Astrophysics Division, Space Science Department of ESA. The nebula around the luminous blue variable η Car is extremely N-rich and C,O-poor, indicative of CNO-cycle products. On the other hand, the recent HST-GHRS observation of the nucleus of η Car shows the spectrum of a star with stellar-wind lines of C ii,C iv, Si ii, Si iv etc.