HD 150382: A Lithium-rich Star at the Early-AGB Stage?

Abstract We report the discovery of a lithium-rich giant, HD 150382, a post-red-giant-branch clump star. The atmospheric parameters, the chemical abundances for 17 elements, and the isotopic ratio 12 C/ 13 C were determined using the equivalent width and the spectral synthesis methods. The lithium a...

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Bibliographic Details
Published in:The Astronomical journal 2020-01, Vol.159 (1), p.9
Main Authors: Holanda, N., Drake, N. A., Pereira, C. B.
Format: Article
Language:English
Subjects:
Abundance
Astronomy
Asymptotic giant branch stars
Giant stars
Lithium
Luminosity
Metallicity
Organic chemistry
Stellar rotation
Synthesis
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Summary:Abstract We report the discovery of a lithium-rich giant, HD 150382, a post-red-giant-branch clump star. The atmospheric parameters, the chemical abundances for 17 elements, and the isotopic ratio 12 C/ 13 C were determined using the equivalent width and the spectral synthesis methods. The lithium abundance was determined via spectral synthesis of the Li i resonance doublet at λ 6708 yielding log ϵ (Li) NLTE = 2.55. The excited-state line at λ 6104 also was analyzed. In addition, we have used theoretical evolutionary tracks to determine the mass and luminosity of HD 150382 and compare it with other well-known lithium-rich giants in the literature. Our results show that HD 150382 is a slowly rotating K-giant star having near-solar metallicity. We also show that HD 150382 is not s-process enriched, which is in agreement with its evolutionary status. Finally, based on the abundance results, we study the possible scenarios of the lithium enrichment.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab5528