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<p>Buenos días, </p>
<p>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: <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" class="gmail_signature">
<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>
</div>
<div>ID de reunión: 896 4268 7970</div>
<div>Código de acceso: 526656</div>
<div><br>
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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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