Table · dataset · 2026
Halpha emission-line stars from LAMOST MRS DR7
Listed in IVOA Registry (Virtual Observatory)
Stars that exhibit prominent emission lines in their spectra are referred to as emission-line stars, encompassing a wide range of stellar types and indicative of intriguing physical properties.
Description
The Large Sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) has released millions of spectra from its Medium-Resolution Survey (MRS). A small fraction of these spectra exhibit emission lines, yet they remain undiscovered and unanalyzed due to being buried in the vast dataset.
We have developed a method based on derivative spectroscopy, which provides a novel approach for detecting and identifying emission-line stars by extracting signals from complex backgrounds and estimating spectral line profiles. Applying this method to the H{alpha} spectral line profiles from the LAMOST-MRS Data Release 7, we compiled a catalog of emission-line stars using the second- and third-derivative spectra for automated peak detection.
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This approach also facilitates the classification of H{alpha} emission-line morphologies through a simplified scheme. The catalog comprises 56,649 spectra with relatively prominent H{alpha} emission lines from 45,206 unique stars, with each emission-line component accompanied by approximate estimates of its wavelength, amplitude, and width. All H{alpha} spectral lines were classified into three morphological classes under a unified classification scheme: single emission peak (83.0%), double emission peaks (5.6%), and P Cygni-type profiles (11.5%), which encompass both P Cygni and inverse P Cygni features.
Through cross-referencing with SIMBAD, 39,497 stars represent new emission-line sources discovered in our research.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/65 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025ApJS..281...65Y ui.adsabs.harvard.edu/abs/2025ApJS..281...65Y ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apjs/281/65 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apjs/281/65 | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |