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SUMMARY:COLLOQUIUM Alexander Heger, Monash University
DTSTART;TZID=Europe/Berlin:20250513T140000
DTEND;TZID=Europe/Berlin:20250513T153000
DTSTAMP:20260714T1547Z
DESCRIPTION:Finding the Oldest Star \n
The discovery of entire, apparently well-developed, galaxies at
unexpectedly high red shifts by JWST has fuelled new interest in the
very first stars that must have stood at the beginning of these
galaxies.  The first stars mark the transition from the cosmic dark
ages to the modern universe that we know today, a universe that is
filled with stars, galaxies, and heavy elements essential to life.
The first stars stand out because of their pristine primordial initial
composition and their pre-galactic formation environment.  Their
unique composition dramatically alter their evolution, their
structure, the way they die as supernovae, and their resulting
nucleosynthesis.  The special circumstances under which these stars
were formed also impacts their characteristic initial mass
distribution, the initial mass function.  Generally, it is assumed
that these stars typically were significantly more massive than
present-day stars.  No low-mass Population III star that could have
survived to the present day has ever been found.  I will give an
overview of the evolution and death of these first stars and their
supernova.  I will discuss nucleosynthesis signatures as possible
diagnostics we may use at the present day to learn about these first
stars, and where to find these patterns --- with the interesting
perspective of potentially identifying the oldest stars in our Milky
Way, which may not be the most metal-poor.
\nTalk in presence and via Zoom:\n
https://uni-hamburg.zoom.us/j/66006535328?pwd=aGkrSjJIYmZjK0VpYlpGL0ZrdHg2UT09\n
\n
This talk is not part of the seminar on astrophysics. Everybody is welcome though.\n
LOCATION:Hamburg Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Bibliothek
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