[AAA] Ciclo de Seminarios LLAMA-IAFE

[Silvina Cichowolski]

Estimadas y estimados colegas,

Nos ponemos en contacto con ustedes para invitarlas/os a un Ciclo de
Seminarios que estamos organizando para que las comunidades astronómicas de
Argentina y Brasil empiecen a tomar contacto con el proyecto LLAMA.

LLAMA (Large Latin American Millimeter Array) es un radiotelescopio de 12
metros de diámetro  cuya construcción está siendo llevada a cabo por
Argentina y Brasil y será puesto en marcha en la provincia de Salta, a una
altura de 4.830 msnm.
El instrumento podrá observar en distintas bandas (B1-B9 simil ALMA),
cubriendo un rango de frecuencias de 35–950 GHz (longitudes de onda
milimétricas y submilimétricas).

El objetivo principal de estos encuentros es difundir las novedades sobre
LLAMA, discutir la ciencia que podrá llevarse a cabo  y  motivar la
comunicación e interacción entre investigadores y estudiantes de las
distintas áreas de la astronomía.

*El Ciclo de Seminarios LLAMA tendrá lugar los primeros viernes de cada
mes, de 10 a 12 hs, en formato virtual.*
Cada encuentro consistirá de 3 charlas invitadas (la primera de 40 minutos
de duración y las otras dos de 20 minutos cada una) e intervalos para
discusiones.

*El primer encuentro será el viernes 4 de junio de 2021*, *con el siguiente
cronograma:*

*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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Para unirse al encuentro:

Join Zoom Meeting
https://us02web.zoom.us/j/86920302374?pwd=QkhKcm9xdXRGdnIzcnAyOFlvR2RFdz09

Meeting ID: 869 2030 2374
Passcode: 624154
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Las/os esperamos

Comité organizador del Ciclo de Seminarios LLAMA

Silvina Cichowolski (IAFE)
Germán Cristiani  (IAFE)
Nicolás Duronea (IALP)
Laura Suad  (IAFE)
Carlos Valotto (IATE)
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