Magnetic activities and parameters of 43 flare stars in the GWAC archive
arXiv:2211.11240 · doi:10.1088/1674-4527/aca506
Abstract
In the archive of the Ground Wide Angle Camera (GWAC), we found 43 white light flares from 43 stars, among which, three are sympathetic or homologous flares, and one of them also has a quasi-periodic pulsation with a period of minutes. Among these 43 flare stars, there are 19 new active stars and 41 stars that have available TESS and/or K2 light curves, from which we found 931 stellar flares. We also obtained rotational or orbital periods of 34 GWAC flare stars, of which 33 are less than 5.4 days, and ephemerides of three eclipsing binaries from these light curves. Combining with low resolution spectra from LAMOST and the Xinglong 2.16m telescope, we found that are in the saturation region in the rotation-activity diagram. From the LAMOST medium-resolution spectrum, we found that Star \#3 (HAT 178-02667) has double H emissions which imply it is a binary, and two components are both active stars. Thirteen stars have flare frequency distributions (FFDs) from TESS and/or K2 light curves. These FFDs show that the flares detected by GWAC can occur at a frequency of 0.5 to 9.5 yr. The impact of flares on habitable planets was also studied based on these FFDs, and flares from some GWAC flare stars may produce enough energetic flares to destroy ozone layers, but none can trigger prebiotic chemistry on their habitable planets.
20 pages, 9 figures, 3 tables
References in corpus (30)
- The Transiting Exoplanet Survey Satellite
- Gaia Early Data Release 3: Photometric content and validation
- An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
- The H emission of nearby M dwarfs and its relation to stellar rotation
- Flare-productive active regions
- Quasi-periodic pulsations in solar and stellar flares: an overview of recent results
- M Dwarfs in SDSS Stripe 82: Photometric Light Curves and Flare Rate Analysis
- The flare catalog and the flare activity in the Kepler mission
- Evryscope science: exploring the potential of all-sky gigapixel-scale telescopes
- The Evolution of Flare Activity with Stellar Age
- Soft X-ray Pulsations in Solar Flares
- No Such Thing as a Simple Flare: Substructure and QPPs Observed in a Statistical Sample of 20 Second Cadence TESS Flares
- EvryFlare III: Temperature Evolution and Habitability Impacts of Dozens of Superflares Observed Simultaneously by Evryscope and TESS
- Flares in Open Clusters with K2. II. Pleiades, Hyades, Praesepe, Ruprecht 147, and M67
- Superflares, chromospheric activities and photometric variabilities of solar-type stars from the second-year observation of TESS and spectra of LAMOST
- Stellar flares detected with the Next Generation Transit Survey
- Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data
- Magnetic Activity of F-, G-, and K-type Stars in the LAMOST-Kepler Field
- Magnetic Flux and Magnetic Non-potentiality of Active Regions in Eruptive and Confined Solar Flares
- A Catalog of M-dwarf Flares with ASAS-SN
- Detection of Flare-associated CME Candidates on Two M-dwarfs by GWAC and Fast, Time-resolved Spectroscopic Follow-ups
- External reconnection and resultant reconfiguration of overlying magnetic fields during sympathetic eruptions of two filaments
- Ultracool Dwarfs Survey. VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
- Stellar Flares versus Luminosity: XUV-induced Atmospheric Escape and Planetary Habitability
- TESS observations of flares and quasi-periodic pulsations from low mass stars and potential impact on exoplanets
- Comparison of Emission Properties of two Homologous Flares in AR 11283
- A new view of the corona of classical T Tauri stars: Effects of flaring activity in circumstellar disks
- A mag Super Flare of An Ultracool Star Detected by System
- Flaring-associated Complex Dynamics in Two M-dwarfs Revealed by Fast, Time-resolved Spectroscopy
- Homologous flaring activity over a sunspot light bridge in an emerging active region