[Astronomy seminar] Astro department seminar - Friday, Sept 16th - Avishai Gilkis

[Astronomy seminar announcements]

Kind reminder about Avishai Gilkis’ seminar in FC61 and on zoom in 50 minutes!
> https://stockholmuniversity.zoom.us/s/61002076352 <https://stockholmuniversity.zoom.us/s/61002076352>
For external speakers we leave the zoom channel open for a little while after the questions so you can have a chat with the speaker.
We will then head to Proviant for lunch at around 12. Feel free to join!

Kind regards,
Eliot

> On 12 Sep 2022, at 16:42, Eliot Ayache <eliot.ayache at astro.su.se> wrote:
> 
> The next SU astronomy departmental seminar will take place on Friday September 16th at 10:30 in room FC 61 (AlbaNova building, 6th floor) and on zoom.
> 
> ---------------------------------------------------------------------------------------------------------------------------------
> 
> Speaker: Avishai Gilkis - Tel Aviv University
> Title: Uncertainty in envelope removal of core-collapse supernova progenitors
> 
> Abstract: 
> The theoretical modeling of massive star evolution is riddled with uncertainties. Two such unresolved aspects are mass loss by stellar winds and mixing in stellar interiors. In my talk I will discuss the implications of these uncertainties on reconciling theory with observations of massive stellar endpoints. In the first part I will present the role of winds for progenitors of stripped-envelope supernovae. While it is commonly assumed that binary interaction removes the hydrogen envelope, the assumed post-interaction mass-loss rate is crucial for the resulting supernova type. I will show how we assess the hydrogen mass in stripped-envelope supernova progenitors by comparing pre-supernova photometry with evolution models. In the second part of the talk I will focus on the lack of observed cool and very luminous supergiant stars, an unexplained phenomenon termed the “Humphreys-Davidson Limit”, which is in contrast to simulations of evolved massive stars. I will show how enhanced mixing above convective cores can aid in removing the hydrogen envelope and ease the tension between theory and observations for such stars at the high-mass end, which are also thought to be the progenitors of merging black holes.
> 
> ---------------------------------------------------------------------------------------------------------------------------------
> 
> We look forward to seeing many of you there. Thanks!
> 
> Eliot and Kris
> 
> 
> Topic: Astronomy Department Seminar Gregor Traven
> Time: Sept 9, 2022 10:30 AM Stockholm
> 
> Join Zoom Meeting:
> https://stockholmuniversity.zoom.us/s/61002076352 <https://stockholmuniversity.zoom.us/s/61002076352>
> 
> Meeting ID: 610 0207 6352

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