Table · dataset · 2026
K stars abundance and activity from LAMOST DR10
Listed in IVOA Registry (Virtual Observatory)
K-type stars are important objects of our Galaxy.
Description
It is interesting to determine the stellar physical parameters and magnetic activity properties of K-type stars. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR10 provides more than 1 million spectra of K-type stars.
We have used spectra with a signal-to-noise ratio greater than 10 as our objects in the large amount of spectral data that we have analyzed. We used the spectral subtraction method to reduce the observational spectra by utilizing the iSpec program. We have determined the chromospheric activity of K-type stars using the H{alpha} line.
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Among more than 1.33 million spectra associated with about 1.06 million stars, there are a total of 150,000 stellar spectra that have excess chromospheric activity. For K stars with rotation periods above 6.20 days, the chromospheric activity decreases rapidly as the period increases. We calculated the solar Rossby number R_Osun_=1.85, and conclude that when the Rossby number R_O_/R_Osun_<0.07, R'_Halpha_ remains stable; when R_O_/R_Osun_>>0.07, R'_Halpha_ decreases as R_O_/R_Osun_ increases.
By crossmatching with the Gaia survey, we also determined their distances and found that the active fraction decreases as the distance above the Galactic disk increases.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/281/5 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025ApJS..281....5Z ui.adsabs.harvard.edu/abs/2025ApJS..281....5Z ↗
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/281/5 ↗
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/281/5 | 12 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 |