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TAPIR Seminar

Friday, September 28, 2018
2:00pm to 3:00pm
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Cahill 370
Where did the first normal stars come from?
Britton Smith, Assistant Research Scientist, San Diego Supercomputer Center, UC San Diego,
It is well known that stars observed in the local Universe form with something very close to a universal initial mass function (IMF) where the vast majority are of low mass. However, theory and simulations of the formation of the first stars in the Universe predict a top-heavy IMF with significant dependence on environment. How and when does this transition occur? This has been studied extensively with simplistic models of collapsing gas and highly idealized 3D simulations, but few works have attempted to simulate the formation of the first low mass stars within a cosmological context. I will present a series of simulations that begin with cosmological initial conditions and end with the collapse and fragmentation of metal-enriched gas on scales of a few hundred AU. With these simulations, we are able to study the physical conditions in which the oldest stars observed formed as well as the means by which star-forming gas was first enriched with metals.
For more information, please contact JoAnn Boyd by phone at 4280 or by email at [email protected].