Por iniciativa del Instituto de Astronomí­a y Fí­sica del Espacio - IAFE (CONICET-UBA, Argentina), en 2021 estamos iniciando una serie de reuniones mensuales para presentar y discutir proyectos cientí­ficos relacionados con Large Latin American Millimeter/submillimeter Array (LLAMA). El propósito de los encuentros será familiarizar a las comunidades astronómicas de Argentina y Brasil con todo el potencial de LLAMA, con el fin de incentivar la articulación de proyectos cientí­ficos para el nuevo radio observatorio.

El Ciclo de Seminarios LLAMA-IAFE tendrá lugar los primeros viernes de cada mes, de 10 a 12 hs, en formato virtual. Cada encuentro consistirá de tres charlas invitadas (la primera de 40 minutos de duración y las otras dos de 20 minutos cada una) e intervalos para discusiones.

Los invitamos a todos al seminario de apertura del ciclo, que tendrá lugar el 4 de junio de 2021. 

La participación online en los seminarios se realizará a través de la plataforma Zoom. 

Comisión Organizadora: Silvina Cichowolski (IAFE) - scicho@iafe.uba.ar; Germán Cristiani (IAFE); Nicolás Duronea (IALP); Laura Suad (IAFE) y Carlos Valotto (IATE).

Programa


4 de junio de 2021

Para unirse al encuentro:


10:00 hs  Félix Mirabel (IAFE, Buenos Aires, Argentina) - The origin of project LLAMA 

Abstract: I have been asked to talk on the origin of project LLAMA (Large Latin American Millimeter Array). By personal initiative in 1984 I make the first exploration in the Puna of Salta, Jujuy and Catamarca for the installation of the European project LSA (Large Submillimetre Array). Sites in Macon and near San Antonio de los Cobres among others are identified in the province of Salta. In the 1990´s LSA merged with the Nord American project MMA (Milli-meter Array) in the global project ALMA (Atacama Large Millimeter Array) to be installed in Chajnantor, Chile. In the period 2004-2009, being Representative and Director of the Office of Science of the European Southern Observatories (ESO) in Chile, I propose to the director of ALMA, the head of MinCyT (Ministry of Science & Technology of Argentina), Jacques Lepine and Zulema Abraham (University of Sao Paulo) project LLAMA. In 2014 it is signed an agreement between MinCyT and FAPESP for the construction and operation of LLAMA. A personal view on this subject can be found (in spanish) in pages 67-69 of the following link: https://aargentinapciencias.org/wp-content/uploads/2021/03/03-RESENA-Mirabel-CeIResenasT9N1-2021indd.pdf.

11:00 hs  Zulema Abraham (IAG, Universidade de São Paulo, Brasil) - Eta Carinae : a perfect target for LLAMA

Abstract: Eta Carinae is one of the most massive stars of our Galaxy. It is an evolved star that presented several episodes of mass ejection, one of them occurred in 1840 and formed what is now known as the Homunculus Nebula. Eta Carinae is part of a binary system, in which the collision between the strong stellar winds heats the gas that emits in X-rays. The UV radiation of the stars ionizes the circumstellar matter, producing radiation from the UV to radio frequencies. At mm and sub-millimeter wavelengths, strong continuum and H recombination lines have been observed since 1995, but the actual source was only resolved by ALMA in 2017. I will present the results of these ALMA observations and show the importance of LLAMA for the follow up of the continuum and recombination lines at different frequencies to understand its variability with the orbital phase of the binary system.

11:30 hs  Lydia Cidale (FCAGLP, La Plata, Argentina) - Dust and gaseous environments around massive stars

Abstract: Evolved massive stars undergo phases of strong mass-loss, often resulting in the formation of shells, disks or rings of circumstellar material. The expelled material can lead to molecule and dust condensation. Studies of the atomic and molecular gas reveal a complex kinematics and geometry. We describe here different techniques to analyze and interpret the physical conditions around hot emission-line stars.


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El próximo encuentro se llevará a cabo el 2 de julio de 2021. Los detalles se presentarón en breve.