Table · dataset · 2022
X-ray flare LCs of the RS CVn-type star GT Mus
Listed in IVOA Registry (Virtual Observatory)
We report that the RS CVn-type star GT Mus (HR 4492, HD101379+HD101380) was the most active star in the X-ray sky in the last decade in terms of the scale of recurrent energetic flares.
Description
We detected 11 flares from GT Mus in 8yr of observations with the Monitor of All-sky X-ray Image (MAXI) from 2009 August to 2017 August. The detected flare peak luminosities were 1-4x10^33^erg/s in the 2.0-20.0keV band for its distance of 109.6pc.
Our timing analysis showed long durations ({tau}_r_+{tau}_d_) of 2-6d with long decay times ({tau}_d_) of 1-4d. The released energies during the decay phases of the flares in the 0.1-100keV band were in the range of 1-11x10^38^erg, which are at the upper end of the observed stellar flare. The released energies during the whole duration were in the range of 2-13x10^38^erg in the same band.
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We carried out X-ray follow-up observations for one of the 11 flares with the Neutron star Interior Composition Explorer (NICER) on 2017 July 18 and found that the flare cooled quasi-statically. On the basis of a quasi-static cooling model, the flare loop length is derived to be 4x10^12^cm (or 60R_{sun}_). The electron density is derived to be 1x10^10^cm^-3^, which is consistent with the typical value of solar and stellar flares (10^10-13^cm^-3^).
The ratio of the cooling timescales between radiative ({tau}_rad_) and conductive ({tau}_cond_) cooling is estimated to be {tau}_rad_~0.1{tau}_cond_ from the temperature; thus, radiative cooling was dominant in this flare.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/910/25 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021ApJ...910...25S ui.adsabs.harvard.edu/abs/2021ApJ...910...25S ↗
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/apj/910/25 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- X-Ray
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Image 75%
Provenance · 1 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/910/25 | 15 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:x-ray | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |