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

Dodangodage, Randika

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

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

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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