S-type Stars: LaO Line List for the B2Σ+–X2Σ+ Band System

LaO bands are a characteristic feature in the spectrum of cool S-type stars. La is made primarily by the s-process during the asymptotic giant branch phase of stellar evolution. The B2Σ+–X2Σ+ and A2Π–X2Σ+ band systems can be used to determine the La abundances in cool S stars. The bands of the B2Σ+–...

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Bibliographic Details
Published in:The Astrophysical journal 2022-07, Vol.933 (1), p.99
Main Authors: Bernath, P. F., Dodangodage, R., Liévin, J.
Format: Article
Language:English
Subjects:
Abundance
Astrophysics
Dipoles
Emission analysis
Laboratory astrophysics
S stars
Spectral line lists
Stars
Stellar evolution
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Summary:LaO bands are a characteristic feature in the spectrum of cool S-type stars. La is made primarily by the s-process during the asymptotic giant branch phase of stellar evolution. The B2Σ+–X2Σ+ and A2Π–X2Σ+ band systems can be used to determine the La abundances in cool S stars. The bands of the B2Σ+–X2Σ+ with v′ and v′′≤5 have been rotationally analyzed from an emission spectrum from a carbon furnace. Line strengths are calculated using an ab initio transition dipole function, corrected using experimental lifetimes. We provide a line list for the B2Σ+–X2Σ+ band system that can be used to determine La abundances.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac731f