Table · dataset · 2025
Magnetic activity of RS CVn stars
Listed in IVOA Registry (Virtual Observatory)
Understanding flare activity in RS CVn stars is crucial for elucidating their magnetic activity properties.
Description
This study aims to conduct a detailed statistical analysis of stellar flare characteristics in RS CVn-type stars using data from the Transiting Exoplanet Survey Satellite (TESS) and the Large Sky Area Multi- Object Fiber Spectroscopic Telescope (LAMOST) surveys. We initially identified 80305 candidates from the International Variable Star Index (VSX) and refined the sample to 1812 RS CVn stars through SIMBAD cross-matching.
Using TESS 2-minute cadence data, we processed 958 light curves from 246 targets, detecting 1254 flare events among 144 flare stars. By cross-matching with the LAMOST DR10 data, we obtained 148 and 482 low resolution and medium resolution spectra for 90 and 37 RS CVn-type sources. With LAMOST data, we calculated and statistically analyzed several stellar magnetic activity indicators, like H{alpha} equivalent width.
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Combining Gaia survey, TESS Input Catalog, and LAMOST survey data, we investigated relationships between flare parameters and stellar characteristics. Of the 1254 observed flare events, over 89% had durations <1 hour, and more than 90% had amplitudes <0.01. The flare stars concentrate within temperature (4000-6500K), mass (<1M_{sun}_), and radius (0-5R_{sun}_) ranges, with 21 stars deriving parameters from their primary components.
The flare occurrence percentage is higher for temperatures between 3000-4000K and orbital periods <10 days. The duration ( {tau} ) is related to the energy (E) by the power law {tau}{prop.to}E^0.3-0.41^. The power-law index {alpha} of the cumulative flare frequency distribution is about 1.22+/-0.09.
We analyzed flare rotational phases and found no preference, indicating random occurrence. Medium-resolution spectra revealed asymmetry in the H{alpha} profiles of one source TIC 46296256, which might be caused by the coronal rain, binary motion, or chromospheric condensation.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A322 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2025A&A...699A.322X ui.adsabs.harvard.edu/abs/2025A%26A...699A.322X ↗
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/a%2Ba/699/a322 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Astronomical sciences 72%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/699/a322 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5101 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (72%) |
| 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 |