University of Illinois Urbana-Champaign

Lao Line List For The B2ς+- X2ς+ Band System

Dodangodage, Randika

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TB05_1.pptx
5898.pdf

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https://hdl.handle.net/2142/116889

Description

Title
Lao Line List For The B2ς+- X2ς+ Band System
Author(s)
Dodangodage, Randika
Contributor(s)
  • Liévin, Jacques
  • Bernath, Peter F.
Issue Date
2022-06-21
Keyword(s)
Mini-symposium: Benchmarking in Spectroscopy
Abstract
LaO bands appear in the optical spectra of S-type stars. The formation of the elements can be studied by measuring the stellar abundances of heavy metals such as La. For cooler stars, the visible and near-infrared electronic transitions of LaO are more useful than La atomic lines. \\ We have analyzed the LaO B$^{2}\Sigma^{+}$-X$^{2}\Sigma^{+}$ band system up to v=5 in both ground and excited states. The rotational analysis of the B$^{2}\Sigma^{+}$-X$^{2}\Sigma^{+}$ transition was carried out using the PGOPHER program. Most of the ground state spectroscopic parameters and hyperfine parameters of the excited B$^{2}\Sigma^{+}$ state were taken from literature and kept fixed. The equilibrium constants for X$^{2}\Sigma^{+}$ and B$^{2}\Sigma^{+}$ states were determined. The line strengths were calculated based on the ab initio transition dipole moment and RKR potential curves. We also provide radiative lifetimes of the B$^{2}\Sigma^{+}$ state for v=0 to v=4. With this work, we provide a modern line list for the LaO B$^{2}\Sigma^{+}$-X$^{2}\Sigma^{+}$ transition that can be used to simulate LaO spectra of cool S-type stars to determine La abundances.\\ A similar analysis is in progress for the LaO A$^{2}\Pi$-X$^{2}\Sigma^{+}$ transition.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116889
DOI
https://doi.org/10.15278/isms.2022.TB05
Copyright and License Information
Copyright 2022 held by the authors

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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY