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Dear all,<br>
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This is a reminder of the weekly SU astronomy departmental
seminar that will take place in about 45 minutes, <b>at
10:30am in room FC61</b> (AlbaNova building, 6th floor) <b>and
on zoom</b> (<a
href="https://stockholmuniversity.zoom.us/s/61002076352"
target="_blank" rel="noopener noreferrer"
id="LPlnk88844" class="moz-txt-link-freetext">https://stockholmuniversity.zoom.us/s/61002076352</a>).
This is the first seminar after the summer break and as
usual, we encourage you to attend in person if possible.<br>
<br>
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<div>________________________________________________<br>
<b>
</b><b>Speaker: Janez Kos (Ljubljana University)
</b>
<div><b>Title: Tidal tails of open clusters</b></div>
<a moz-do-not-send="true"
href="https://www.albanova.se/event/janez-kos/"
class="moz-txt-link-freetext">https://www.albanova.se/event/janez-kos/</a><br>
<div>Abstract:</div>
<div>Tidal tails of open clusters have first been observed
only in the recent couple of years. Like the tails of
globular clusters and satellite galaxies, they can be
used as important probes of gravitational fields,
galactic evolution, disk kinematics, and stellar
evolution. Recent progress has been possible with the
arrival of Gaia data releases, so we can find tails of
structures 1000 times smaller than globular clusters in
the environment 1000 times denser than the halo. I will
present a probabilistic method that does not directly
rely on finding overdensities. We use simulations of
cluster disintegration to define likelihoods for Gaia
stars to be cluster members, and simulations of the
Galactic stellar population to define membership
probabilities. In an analysis of 500 clusters, we
reliably find stars in tidal tails 1000 pc away from
cluster cores. I will also discuss the need for precise
radial velocities (not used in our method), obtaining
more complete mass functions, and observed oddities that
hint at numerous kinematical processes that shape the
tidal tails.<br>
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<div>________________________________________________<br>
<br>
We look forward to seeing many of you there. Thanks!<br>
<br>
Adur and Adélaïde<br>
<br>
You can subscribe to the seminars calendar in: <a
href="https://ttt.astro.su.se/ical/astro-seminars.ics"
class="moz-txt-link-freetext">
https://ttt.astro.su.se/ical/astro-seminars.ics</a><br>
(Please note that calendar can be subject to updates)<br>
<br>
Upcoming Events:<br>
<br>
2023-09-08 Mattia Bulla (University of Ferrara)<br>
2023-09-15 SU-UU conference (no astronomy seminar)<br>
2023-09-22 Henk Spruit (MPIA)<br>
<br>
________________________________________________<br>
Join Zoom Meeting:<br>
<a
href="https://stockholmuniversity.zoom.us/s/61002076352"
style="text-decoration:none;"
class="moz-txt-link-freetext">https://stockholmuniversity.zoom.us/s/61002076352</a><br>
Meeting ID: 610 0207 6352
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