[Graduados] 22/04: Seminario FCAG "Variability of Galactic blue supergiants observed with TESS" - Dr. Michalis Kourniotis (Astronomical Institute, Czech Academy of Sciences)

[Secretaría de Ciencia y Técnica]

Buenos días,

les informamos que el próximo lunes 22 de abril a las 14h, en el Salón 
Meridiano, se brindará la siguiente charla en el marco de los Seminarios 
de la FCAG: *Variability of Galactic blue supergiants observed with 
TESS*. La misma estará a cargo del *Dr. Michalis Kourniotis 
(Astronomical Institute, Czech Academy of Sciences)*, profesor invitado 
de la Dra. Lydia Cidale. A continuación les dejamos el resumen y los 
datos de conexión para aquellos que no puedan acercarse al Salón Meridiano.

***Resumen: *Blue supergiants (BSGs) are core-helium or shell-hydrogen 
burning stars of OB type that evolve redwards, bringing so the poorly 
explored gap between the hot early phases of massive stars and their 
late stages prior to their supernova explosion. As a result, they 
mediate between stellar types with divergent properties with respect to 
atmospheric stability, mass loss, and interior structure. Therefore, 
their study offers a unique opportunity to capture deterministic for the 
post-main sequence evolution mechanisms, which drive evolutionary 
channels to the occurrence of rare exotic stars such as the luminous 
blue variables, and lead to the diverse types of supernovae. The current 
study focuses on a compilation of 64 Galactic southern BSGs, significant 
fraction of which have been observed with CASLEO 2.15 JS m telescope. In 
collaboration with the massive star group of University of La Plata, we 
systematically explore the TESS light curves of the studied sample in 
order to characterize the stellar variability with timescales up to 80 
d, periodicity up to 14 d that is attributed to gravity-mode 
oscillations or to rotational modulation, as well as stochastic 
low-frequency variability that is generated by the turbulent convective 
core and/or to sub-surface convection. We present correlations between 
the stellar parameters and the manifestations of the individual physical 
mechanisms on the time-series data, further extending our discussion to 
diagnostics of the evolutionary stage of BSGs and of their binarity.

***Datos de conexión:* **

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Unirse a la reunión zoom: https://us02web.zoom.us/j/89642687970
ID de reunión: 896 4268 7970
Código de acceso: 526656

*A fin de reducir el uso de residuos plásticos, les solicitamos que se 
acerquen con sus propias tazas para el café.*
Aunque este seminario será en formato híbrido, esperamos contar con su 
presencia.

Saludos,

Secyt-FCAG
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