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<p>Buenos días, </p>
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<p>les recordamos que hoy a las 14h, en el Salón Meridiano, se
brindará la siguiente charla en el marco de los Seminarios de la
FCAG: <b>Variability of Galactic blue supergiants observed with
TESS</b>. La misma estará a cargo del <b>Dr. Michalis
Kourniotis (Astronomical Institute, Czech Academy of Sciences)</b>,
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. </p>
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<p><b> </b><b>Resumen: </b>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.</p>
<p><b style="font-weight:normal;"
id="docs-internal-guid-9900c2c0-7fff-a3eb-cd2d-42c502fb9543"><b
style="font-weight:normal;"
id="docs-internal-guid-84bbdb09-7fff-3b80-37a8-3bd0810a2176"><b>Datos de
conexión:</b> </b></b></p>
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<div dir="ltr"> <b style="font-weight:normal;"
id="docs-internal-guid-9900c2c0-7fff-a3eb-cd2d-42c502fb9543"> </b> <b
style="font-weight:normal;"
id="docs-internal-guid-84bbdb09-7fff-3b80-37a8-3bd0810a2176"> </b> <b
style="font-weight:normal;"
id="docs-internal-guid-84bbdb09-7fff-3b80-37a8-3bd0810a2176"> </b>
<div><b style="font-weight:normal;"
id="docs-internal-guid-84bbdb09-7fff-3b80-37a8-3bd0810a2176"> </b></div>
<div>Unirse a la reunión zoom: <a
href="https://us02web.zoom.us/j/89642687970"
class="moz-txt-link-freetext" moz-do-not-send="true">https://us02web.zoom.us/j/89642687970</a>
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<div>ID de reunión: 896 4268 7970</div>
<div>Código de acceso: 526656</div>
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<div><b>A fin de reducir el uso de residuos plásticos,
les solicitamos que se acerquen con sus propias
tazas para el café.</b></div>
<div>Aunque este seminario será en formato híbrido,
esperamos contar con su presencia.</div>
<p> Saludos, <br>
</p>
<p>Secyt-FCAG</p>
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