A catalog of early-type H{\alpha} emission line stars and 58 newly confirmed Herbig Ae/Bes from LAMOST DR7
Yun-Jun Zhang, Wen Hou, A-Li Luo, Shuo Li, Li Qin, Yan Lu, Yin-Bi Li,, Jian-Jun Chen, and Yong-Heng Zhao

TL;DR
This paper presents a comprehensive catalog of early-type emission-line stars from LAMOST DR7, introduces a new method to distinguish Herbig Ae/Be stars from classical Be stars, and confirms 58 new Herbig Ae/Be stars, expanding the known population.
Contribution
It provides a large, classified catalog of early-type emission-line stars, proposes updated criteria to differentiate Herbig Ae/Be stars, and confirms new candidates using multi-wavelength data.
Findings
Catalog includes 30,048 spectra of 25,886 stars, with 3,922 having prior records.
Identified 66 confirmed Herbig Ae/Be stars, 58 of which are newly discovered.
Most confirmed Herbig Ae/Be stars are distant, located beyond 1 Kpc.
Abstract
We derive a catalog of early-type emission-line stars including 30,048 spectra of 25,886 stars from LAMOST DR7, in which 3,922 have Simbad records. The sample is obtained using K-Nearest Neighbor and Random Forest methods and visually inspected. The spectra are classified into 3 morphological types (10 subtypes) based on H emission line profiles. Some spectra contaminated by nebula emission lines such as from HII regions are flagged in the catalog. We also provide a specific sub-catalog of 101 stars with the stellar wind by calculating stellar wind or accretion flow velocities based on P Cygni or inverse P Cygni profiles, in which 74\% of them having velocities below 400km/s. More important, with two color-color diagrams (H-K, K- W1) and (H-K, J-H) of a collection of known Herbig Ae/Be stars (HAeBes) and classical Ae/Be stars (CAeBes), we propose an updated criterion to separate…
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