Abstract
The study is devoted to search for flare stars among confirmed members of Galactic open clusters using high-cadence photometry from {\it TESS} mission. We analyzed 957 high-cadence light curves of members from 136 open clusters. As a result, 56 flare stars were found, among them 8 hot B-A type objects. Of all flares, 63\% were detected in a sample of cool stars ($T_{\rm eff}<5000$~K), and 29\% -- in stars of spectral type G, while 23\% in K-type stars and approximately 34\% of all detected flares are in M-type stars. Using the FLATW'RM (FLAre deTection With Ransac Method) flare finding algorithm, we estimated parameters of flares and rotation period of detected flare stars. The flare with the largest amplitude appears on the M3 type EQ\,Cha star. Statistical analysis did not reveal any direct correlation between ages, rotation periods and flaring activity.
Highlights
Flare stars – stars having detected at least one very short flare in their light curve – are a widely known type of objects in astrophysics
Data from the first data release of Transiting Exoplanet Survey Satellite (TESS) mission confirm it: among 1228 flare stars detected by Gunther et al (2020), 673 objects were classified as M dwarfs
In order to study the dependence of stellar flaring activity on the age, we performed an uniform study of large sample of Galactic open clusters from catalogue of Cantat-Gaudin et al (2018a)
Summary
Flare stars – stars having detected at least one very short flare in their light curve – are a widely known type of objects in astrophysics. The interest of astronomers to these objects is associated with the incompletely studied mechanisms of formation of flares, and with the possible influence of flares on habitable zone of potential exoplanets. The Kepler mission had a significant impact on the study of flare stars. TESS satellite is a space-borne telescope, whose main objective is the detection and study of exoplanets using the technique of transits. Its database of a high-cadence (2 minute effective sampling) light curves for hundreds of thousands of objects, as well as sequences of Full Frame Images (30 minutes effective sampling), may provide an invaluable resource for the study of many other kinds of astrophysical objects, including flare stars
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