Liu, Z., Cui, W., Gu, J., Shi, J., Hu, G., Wang, X., & Huo, Z. (2024). The Value-added Catalog of OB Stars in LAMOST DR7. arXiv preprint arXiv:2410.15242.
This research aims to update the existing catalog of OB stars by utilizing the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 7 (DR7) and refine the selection criteria for identifying these stars based on their spectral characteristics.
The researchers analyzed LAMOST DR7 spectra, focusing on spectral line indices like equivalent widths of Ca II K, Hγ, and Fe lines. They refined the selection criteria based on the distribution of known OB stars from previous studies (Xiang et al., 2022; Liu et al., 2019) in the spectral index space. The team visually inspected a subset of candidate spectra to ensure accuracy and used the MKCLASS code to determine spectral sub-classifications for the identified OB stars.
This updated catalog of OB stars, identified from LAMOST DR7 spectra, provides a valuable resource for studying massive star evolution, Galactic structure, and star formation regions. The refined selection criteria enhance the completeness of the catalog, particularly for late B-type stars, enabling more comprehensive investigations in future research.
This research contributes significantly to the field of astrophysics by providing a more comprehensive and reliable catalog of OB stars. This catalog will be a valuable tool for astronomers studying the evolution of massive stars, the structure of the Milky Way, and the processes of star formation.
The study acknowledges limitations related to the resolution of LAMOST spectra and the potential for misclassification of some peculiar stars. Future research could focus on obtaining higher-resolution spectra for a subset of the identified OB stars to refine their classifications and investigate their properties in greater detail. Additionally, further analysis of the spatial distribution of these stars could provide insights into the dynamics and evolution of the Milky Way's spiral arms and star-forming regions.
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by Zhicun Liu, ... at arxiv.org 10-22-2024
https://arxiv.org/pdf/2410.15242.pdfDeeper Inquiries