Flaring activities of fast rotating stars Virtual Observatory Resource

Authors
  1. Yang H.
  2. Cheng X.
  3. Liu J.
  4. Liu S.
  5. Zhao Z.
  6. Zhou G.
  7. Hou Y.
  8. Gao C.
  9. Niu Z.
  10. Published by
    CDS
Abstract

The dynamo theory has always been one of the biggest mysteries in stellar physics. One key reason for its uncertainty is poor knowledge of the dynamo process on stars except the Sun. The most important observation feature of solar dynamo is that active regions only appear at low latitudes, which provides a crucial constraint to the dynamo theory, while Doppler imaging, the current technique to spatially resolve stellar hemisphere, is difficult to distinguish the equatorial region . Hence, the latitudinal distribution of active regions (LDAR) of stars is ambiguous and controversial, mainly due to the limit of the current technique for spatially resolving the stellar surface. Fast rotating stars, which are young and active, are thought to operate with a different dynamo process than the Sun. We study their LDAR and compare them with the Sun to reveal the underlying dynamo process. Flares are drastic and observational activity events, which occur in active regions. Here, we propose a new method to study how the apparent flaring activity varies with respect to the inclination to determine the LDAR of fast rotating stars. We find that the LDAR of fast rotating stars is consistent with that of the Sun, contrary to expectations. Our results provide a crucial constraint to stellar dynamo, indicating that the solar-like dynamo also applies to fast rotating stars, even spanning different stages of their evolution.

Keywords
  1. stellar-activity
  2. stellar-flares
  3. stellar-radii
Bibliographic source Bibcode
2025A&A...695A..21Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/695/A21
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/695/A21
Document Object Identifer DOI
doi:10.26093/cds/vizier.36950021

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/695/A21
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/695/A21
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Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/695/A21/table?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/695/A21/table?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/695/A21/table?

History

2025-02-27T09:52:08Z
Resource record created
2025-02-27T09:52:08Z
Created
2025-05-21T20:02:35Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr