[Astronomy seminar] Astronomy departmental seminar September 20 at 10:30am - Cis Raf Lagae (Stockholm University)

[Astronomy seminar announcements]

Dear all,

The next weekly SU astronomy departmental seminar that will take place this Friday September 20, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/61550693125).

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Speaker: Cis Raf Lagae (Stockholm University)
Title: The metal-poor universe in 3D non-LTE
Event: https://indico.fysik.su.se/event/8823/

Abstract: I will present an overview of the research carried out during my PhD which focused on metal-poor, low-mass Milky Way stars, aiming to understand the nature of the first stars and galactic chemical evolution. To reach this goal, we require knowledge of the chemical composition of (metal-poor) stars, which are conventionally determined from a simple 1D LTE abundance analysis. To reduce large systematic errors in abundance measurements and prevent erroneous conclusions, it is necessary to compute synthetic spectra in non-LTE and with 3D stellar atmospheres, simultaneously. For this purpose, I have updated the STAGGER-grid of 3D model atmospheres in the subgiant region (logg<3.5) and prepared the STAGGER-grid for public release. In addition, I am working on a grid of 3D non-LTE spectra of the Ca II triplet lines, which are commonly used for abundance analysis and radial velocity determination in metal-poor stars.

Zoom ID: 615 5069 3125

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We look forward to seeing many of you there. Thanks!

Anjasha and Mingjie

Upcoming Events:

  *   Sep 27 Jonathan Henshaw
  *   Oct 04 No seminar due to Astronomdagarna 2024
  *   Oct 11  Ayan Acharyya
  *   Oct 18 Maria Ramirez

You can subscribe to the seminars calendar in:
https://ttt.astro.su.se/ical/astro-seminars.ics
(Please note that calendar can be subject to updates)
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Join Zoom Meeting
https://stockholmuniversity.zoom.us/j/61550693125

Meeting ID: 615 5069 3125


** Just a small note for the people who prefer slack in OKC, we have created a channel here - https://join.slack.com/share/enQtNzY4MzA3MjEzNDA1NC05M2NiY2UzOGRiZjY0YTFhZDZjMzA1ZjkwZjJjYTBiM2JhNzExOGVmMDlkYTBkNjMxMmY3ZTdiY2UzNjcxNzk3

We will be posting updates there as well.


Mingjie Jian
Postdoctoral Researcher
Department of Astronomy
Stockholm University

AlbaNova University Center
Roslagstullsbacken 21,
114 21 Stockholm, Sweden
mingjie.jian at astro.su.se<mailto:mingjie.jian at astro.su.se>

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