J/AJ/164/223ivo://CDS.VizieR/J/AJ/164/223doi:10.26093/cds/vizier.51640223CDSRabello Soares M.C.de Freitas M.C.Ferreira B.P.L.2023-09-27T06:50:19Z2023-02-08T12:25:05ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frstellar-flaresvisible-astronomystellar-spectral-typesastronomical-object-identificationWe estimated blackbody temperature for 209 flares observed at 69 F-K stars, significantly increasing the number of flare temperature determinations. We used the Blue and Red channels obtained by the 27cm telescope of the CoRoT satellite at high cadence and long duration. The wavelength limits of the channels were estimated using spectra from the Pickles library for the spectral type and luminosity class of each star, provided by the Exodat Database. The temperatures were obtained from the flare energy Blue-to-Red ratio, using the flare equivalent duration and stellar flux in both channels. The expected value of the analyzed flares is equal to 6400K with a standard deviation of 2800K, where the mean stellar spectral type, weighted by the number of flares in each spectral subclass, is equal to G6. Contrary to our results, a stellar white-light flare is often assumed to emit as a blackbody with a temperature of 9000 or 10000K. Our estimates agree, however, with values obtained for solar flares. The GAIA G-band transmissivity is comparable to that of the CoRoT White channel, which allows us to calibrate the flares to the Gaia photometric system. The energy in the G band of the analyzed flares varies between 1032 and 1037erg, and the flare area ranges from 30{mu}sh to 3sh (solar hemisphere). The energy release per area in a flare is proportional to T_flare_^2.6^, at least up to 10000K.2022AJ....164..223Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/164/223CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/PASP/110/863 : A Stellar Spectral Flux Library; 1150 - 25000 A (Pickles 1998)J/A+A/520/A66 : CoRoT-8b light and RV curves (Borde+, 2010)J/A+A/538/A112 : Planetary transit candidates in CoRoT LRa01 (Carone+, 2012)J/other/Nat/485.478 : Superflares on solar-type stars (Maehara+, 2012)J/ApJS/207/15 : M dwarf flare spectra (Kowalski+, 2013)J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013)J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013)J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)J/A+A/581/A66 : UV variability and accretion in NGC 2264 (Venuti+, 2015)J/A+A/602/A117 : Periods of 2290 CoRoT binaries (Klagyivik+, 2017)J/ApJ/851/91 : Statistical studies solar white-light flares (Namekata+, 2017)J/A+A/619/A97 : CoRoT transit catalogue (Deleuil+, 2018)J/AJ/159/60 : 8695 flares 1228 stars in TESS sectors 1 & 2 (Gunther+, 2020)J/ApJ/902/115 : EvryFlare. III. Superflares Evryscope & TESS (Howard+, 2020)J/ApJ/907/89 : Starspots's temperature & area 337 KIC stars (Herbst+, 2021)J/ApJ/906/72 : 2344 superflares on 266 solar-type stars (Okamoto+, 2021)J/A+A/649/A3 : Gaia Early Data Release3 photometric passbands (Riello+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/164/223https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/164/223http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/164/223https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/164/223https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/164/223http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/164/223GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/164/223/table3EDR3 Gaia identification used for each analyzed CoRoT starCoRoTCoRoT IDmeta.id;meta.mainlongprimaryNFlaresNumber of flares observed (table2)meta.numberintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia EDR3 IDmeta.id.crossFlagFlag (1)meta.code.errorcharJ/AJ/164/223/table2Flare catalog for the 69 flaring stars analyzedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpTSpectral type, Exodat databasesrc.spTypecharProt[0.41/47]? Rotation period, daysdtime.periodfloatnullablee_Prot[0.0004/11]? Uncertainty in Protdstat.errorfloatnullablef_Prot[abtd, ] Flag(s) on Prot (1)meta.codeTflare[3.19/37] Flare temperature1000Kphys.temperaturefloate_Tflare[0.3/10] Uncertainty in Tflare1000Kstat.errorfloatf_Tflare[*] Flag on Tflare (2)meta.codecharEgfGaia flare energy, ergs1e-07Jphys.energychare_EgfUncertainty in Egf1e-07Jstat.errorcharAflareFlare areacm**2phys.areachare_AflareUncertainty in Aflarecm**2stat.errorcharCoRoTCoRoT identifiermeta.id;meta.mainlong