[Astronomy seminar] Astronomy departmental seminar November 8 at 10:30am - Ella Wang (Stockholm University)

[Astronomy seminar announcements]

Dear all,

The next weekly SU astronomy departmental seminar will take place on Friday November 8, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/61550693125).

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Speaker: Ella Wang (Stockholm University)
Title: Spectroscopic Measurements of Lithium in Late-type Stars
Event: https://indico.fysik.su.se/event/8965/

Abstract:
Low mass stars retain the chemical imprint of the gas cloud they were born from. Therefore, stellar abundances provide insight into the evolution of stars and chemical elements throughout the life of galaxies, such as our own Milky Way. Galactic archaeology uses stars and their chemical fingerprints like fossils to trace cosmic history. Out of the known elements, lithium (Li) is a uniquely interesting element, produced in Big Bang Nucleosynthesis and cosmic ray spallation, and moderated in stellar evolution. Stellar abundances cannot be directly observed or measured, instead they must be inferred from models. I will discuss the most physically realistic radiative transfer (3D NLTE) models, how accurate they are compared to high fidelity observations, and how these models can be applied to large spectroscopic surveys to improve accuracy of abundances. Through this work, I measure the lithium abundance of the Sun, reject the second cosmological lithium problem, uncover the evolution of the Li-dip up the subgiant branch in field stars, and find a potential signal for planet engulfment.

Zoom ID: 615 5069 3125

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

Mingjie and Anjasha

Upcoming Events
- Nov 15 Giuseppe Morello
- Nov 22 Brian Thorsbro
- Nov 29 Jie Hong

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)

Mingjie and Anjasha

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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