Colloquium
High-accuracy spectral modeling and chemical abundances for the oldest stars
Abstract
Our work focuses on high-accuracy spectral modeling in NLTE, and the determination of chemical abundances for the oldest known stars, providing crucial insights into the early universe and nucleosynthesis processes. Utilizing state-of-the-art spectroscopic techniques, we have analyzed high-resolution observations of the hyper metal-poor star J0815+4729 to derive its precise elemental abundances, including the elements carbon and oxygen. We discuss the implications of our findings on our understanding of the formation and evolution of the oldest stars. In addition, we are constructing a comprehensive NLTE synthetic spectral library that spans from 0.2 to 3 μm in wavelength, which will be made accessible to the public. This spectral library will make a significant impact to large spectroscopy surveys such as APOGEE, DESI, LAMOST, 4MOST, and others.
About the talk
National Astronomical Observatories of China
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About the speaker
Dr. Zhang Junbo obtained her PhD from University of Chinese Academy of Sciences (UCAS) in early 2017 and is currently an assistant researcher at National Astronomical Observatories, Chinese Academy of Sciences (NAOC), where she also serves as a staff astronomer at the Xinglong Observatory. She is now a visiting scholar at IAC, collaborating with Prof. Carlos Allende Prieto. Her research interests encompass element abundance, stellar physics, and the chemo-kinematic evolution of the Milky Way. She specializes in optical observations and data reduction, particularly in high-resolution spectroscopy. She has extensive experience in NLTE analysis of element abundances and is currently concentrating on the NLTE analysis using high-resolution spectra for several key elements.
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