Maryam Saberi

Rosseland Centre for Solar Physics, University of Oslo

Institute of Theoretical Astrophysics, University of Oslo

UV chemistry in the circumstellar envelopes around evolved stars

Abstract: Low- and intermediate-mass stars (M < 8M☉) evolve towards the asymptotic giant branch (AGB) phase, where they eject a substantial amount of their material (up to 80%) into the interstellar medium (ISM). Therefore, AGB stars play a significant role in the galactic chemical evolution by ejecting the synthesised elements to the ISM through strong stellar winds. An extended circumstellar envelope (CSE) will be created around the star as a consequence of the intense mass loss. Observations of molecular species and dust content in CSEs help us to broaden our knowledge on mass-loss process, stellar properties, and the CSE chemistry. In this presentation, I will give an introduction to the CSE chemistry with a focus on the ultraviolet (UV) chemistry. Then, I will show how high spectral and spatial resolution observations of the Atacama large millimetre array (ALMA) can help us to quantify the impact of various sources of UV radiation in the CSE chemistry around evolved stars.

یکشنبه 12 اردیبهشت 1400، ساعت 19:00

Sunday 2 May 2021 – 19:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest