MEASNet. I. A Model for Barium Star Identification and s-process Abundance Estimation from LAMOST DR10 Low-resolution Survey

Barium stars are peculiar stars with enhanced slow neutron capture process ( s -process) elements. Abundance analysis of them aids in better understanding the chemical evolution of the Milky Way. In this paper, we introduce a data-driven method named the memory-enhanced adaptive spectral network (ME...

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Bibliographic Details
Published in:The Astrophysical journal 2024-10, Vol.974 (1), p.78
Main Authors: Song, Shengjun, Kong, Xiaoming, Bu, Yude, Yi, Zhenping, Liu, Meng
Format: Article
Language:English
Subjects:
Abundance
Astronomy data analysis
Barium
Barium stars
Chemical evolution
Chemically peculiar stars
Classification
Data analysis
Milky Way
Nuclear capture
Peculiar stars
S-process
Sky surveys (astronomy)
Spectroscopic telescopes
Stars
Statistical analysis
Stellar abundances
Stellar evolution
Stellar spectra
Thermal neutrons
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Summary:Barium stars are peculiar stars with enhanced slow neutron capture process ( s -process) elements. Abundance analysis of them aids in better understanding the chemical evolution of the Milky Way. In this paper, we introduce a data-driven method named the memory-enhanced adaptive spectral network (MEASNet) to search for barium candidates in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) low-resolution survey (LRS) and estimate the abundance of five s -process elements: Sr, Y, Ba, Ce, and Nd. MEASNet, trained using spectra from common stars in both LAMOST and the Galactic Archaeology with HERMES survey, showcases notable performance: for the classification task, precision = 98.22% and recall = 94.12%; in prediction, the mean absolute error for the seven elements range between 0.07 and 0.15 dex. After training, we apply the model to 4,083,003 stellar spectra from LAMOST DR10 LRS, successfully identifying 1,803,670 spectra of barium candidates ([Ba/Fe] ≥ 0.25 dex) along with their five s -process elemental abundances. The catalog enlarges the sample size, providing a wealth of data for further statistical analysis of the formation and evolution of barium stars. Meanwhile, this work highlights the potential value of MEASNet in star classification and abundance estimation, offering a strong reference for future data-driven models.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad6b2c