J/A+A/699/A322ivo://CDS.VizieR/J/A+A/699/A322doi:10.26093/cds/vizier/bc-nv/ldccCDSXu L.Zhang L.Wang Y.Su T.Han X.L.Misra P.Shu A.Pi Q.2026-08-28T12:15:31Z2025-07-16T08:56:50ZCDS support team

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

cds-question@unistra.frstellar-flaresvisible-astronomyspectroscopychemical-abundancesUnderstanding flare activity in RS CVn stars is crucial for elucidating their magnetic activity properties. This study aims to conduct a detailed statistical analysis of stellar flare characteristics in RS CVn-type stars using data from the Transiting Exoplanet Survey Satellite (TESS) and the Large Sky Area Multi- Object Fiber Spectroscopic Telescope (LAMOST) surveys. We initially identified 80305 candidates from the International Variable Star Index (VSX) and refined the sample to 1812 RS CVn stars through SIMBAD cross-matching. Using TESS 2-minute cadence data, we processed 958 light curves from 246 targets, detecting 1254 flare events among 144 flare stars. By cross-matching with the LAMOST DR10 data, we obtained 148 and 482 low resolution and medium resolution spectra for 90 and 37 RS CVn-type sources. With LAMOST data, we calculated and statistically analyzed several stellar magnetic activity indicators, like H{alpha} equivalent width. Combining Gaia survey, TESS Input Catalog, and LAMOST survey data, we investigated relationships between flare parameters and stellar characteristics. Of the 1254 observed flare events, over 89% had durations <1 hour, and more than 90% had amplitudes <0.01. The flare stars concentrate within temperature (4000-6500K), mass (<1M_{sun}_), and radius (0-5R_{sun}_) ranges, with 21 stars deriving parameters from their primary components. The flare occurrence percentage is higher for temperatures between 3000-4000K and orbital periods <10 days. The duration ( {tau} ) is related to the energy (E) by the power law {tau}{prop.to}E^0.3-0.41^. The power-law index {alpha} of the cumulative flare frequency distribution is about 1.22+/-0.09. We analyzed flare rotational phases and found no preference, indicating random occurrence. Medium-resolution spectra revealed asymmetry in the H{alpha} profiles of one source TIC 46296256, which might be caused by the coronal rain, binary motion, or chromospheric condensation.2025A&A...699A.322Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A322CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A322https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A322http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A322https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A322https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A322http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A322GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/699/A322/tablea1 (Parameters of flare events from TESS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A322/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A322/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A322/tablea1?GETtext/xml+votable180.050000true13.2823675-74.65155810.005555555555555556Cone search capability for table J/A+A/699/A322/tablea2 (Stellar parameters of TESS objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A322/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A322/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A322/tablea2?GETtext/xml+votable180.050000true1.3339-5.70720.005555555555555556Cone search capability for table J/A+A/699/A322/tablea4 (Parameters of Low Resolution)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A322/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A322/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A322/tablea4?GETtext/xml+votable180.050000true71.53991719.4313890.005555555555555556Cone search capability for table J/A+A/699/A322/tablea5 (Parameters of Medium Resolution)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A322/tablea5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A322/tablea5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A322/tablea5?GETtext/xml+votable180.050000true262.1269946.203088890.0055555555555555566/102 214 231 332 338 364 376-377 404 461 472-473 485 496 508 510 686 746 794 798 838 845 859 862 874 924 931 946 1029 1045 1057-1058 1064 1111 1118 1216 1265 1420 1495 1538 1603 1709 1727 2017 2051-2052 2093 2098 2145 2217 2220 2321-2322 2339 2422 2472 2648 2839 3004 3094 3340 3579 4141 4298 4566 4735 4821 4915 5041 5212 5368 5488 5627 5670 5676 6122 6241 6589 6853 7273 7451 7561 7610 7634 7684 7902 8210 8479 8687 8689 8698 8788 8937 9044 9676 9866 9974 10033 10071 10208 10241 10401 10407 10474 10481 10490 10616 10622 10655 10976 11048 11208 11543 11732 11764 11962 12009 12053 12155 12526 12669 12845 13003 13296 13462 13778 13933 13947 14020 14035 14179 14317 14512 14630 14649 14687 15121 15217 15320-15321 15330 15642 15866 15954 16059 16173 16220 16338 17368 17753 17965 17989 18007 18431 18722 18815 18856 19312 19543 19670 19782 19791 20102 20286 20365 21004 21082 21386 21501 21694 21765 21882 22625 22707 22814 22837 22859 22881 22939 22946 22979 23191 23420 23453 24081 24096 24195 24205 24229-24230 24273 24281 25991 26528 26838 27201 27710 27937 28137 28252 28384 28395 28481 28586 29906 31472 31984 32141 32211 32521 32664 32720 32743 32861 33287 33966 34075 34126 34244 35042 35191 35773 35799 36621 36664 36888 37417 38498 38541 38943 38957 39306 39383 39390 39464 40131 41295 41549 41658 41769 42465 43167 43225 43412 45387 46574https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/699/A322?format=asciiOpticaldefaultJ/A+A/699/A322/tablea1Parameters of flare events from TESSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTICTESS ID, TIC NNNNNNNNNmeta.id;meta.mainlongSector[1/74] TESS SECTORobs.fieldintAmpFlare amplitudesrc.var.amplitudedoublee_AmpFlare amplitude errorstat.errordoubleBeginTimeFlare begin timedtime.epochdoublePeakTimeFlare peak timedtime.epochdoubleEndTimeFlare end timedtime.epochdoubleDurFlare Durationdtime.durationdoubleEbol? Bolometric flare energy1e-07Wphys.energydoublenullablee_Ebol? Bolometric flare energy error1e-07Wstat.errordoublenullable_RAPositions from TIC (right ascension part)degpos.eq.ra;meta.main_DEPositions from TIC (declination part)degpos.eq.dec;meta.mainJ/A+A/699/A322/tablea2Stellar parameters of TESS objectse_Mass? Mass errorsolMassstat.error;phys.massfloatnullable[Fe/H]? Metallicity [Fe/H]phys.abund.ZfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTICTESS ID, NNNNNNNNNmeta.id;meta.mainlongprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTESSmag? TESS magnitudemagphot.mag;em.optfloatnullablee_TESSmag? TESS magnitude errormagstat.error;phot.magfloatnullablelogg? Log surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Log surface gravity errorlog(cm.s**-2)stat.errordoublenullableTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Effective temperature errorKstat.error;phys.temperature.effectivefloatnullableRad? RadiussolRadphys.size.radiusfloatnullablee_Rad? Radius errorsolRadstat.errorfloatnullableMass? MasssolMassphys.massfloatnullablee_[Fe/H]? Metallicity [Fe/H] errorstat.error;phys.abund.FefloatnullableAge? AgeGyrtime.agefloatnullablePer? Perioddtime.perioddoublenullableDist? Distancepcpos.distancedoublenullablee_Dist? Distance errorpcstat.errordoublenullableFlareNum? The counts of flare eventsmeta.numberintnullableflareindicates flare events in table A1meta.ref.urlcharJ/A+A/699/A322/tablea4Parameters of Low ResolutionSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTLAMOST identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharEWHaH{alpha} equivalent width0.1nmspect.line.eqWidthdoublee_EWHaH{alpha} equivalent width error0.1nmstat.errordoubleRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainspDisplay the LAMOST spectrummeta.ref.urlcharObsIDLAMOST unique number ID of this spectrummeta.id;obslongMJDModified Julian Datedtime.epochintlogg? Log surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Log surface gravity errorlog(cm.s**-2)stat.errorfloatnullableTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Effective temperature errorKstat.error;phys.temperature.effectivefloatnullableVarEW[Y/N] Variation in EW_Halphameta.codecharJ/A+A/699/A322/tablea5Parameters of Medium ResolutionSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLAMOSTLAMOST identifier, JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharEWHaOriginal H{alpha} equivalent width0.1nmspect.line.eqWidthdoublee_EWHaOriginal H{alpha} equivalent width error0.1nmstat.errordoublespDisplay the LAMOST spectrummeta.ref.urlcharObsIDLAMOST unique number ID of this spectrummeta.id;obslongRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainExtNameThe extension namemeta.idcharLMJM? Local Modified Julian Daydtime.epoch;pos.lsr;pos.lgintnullableSNRSpectrum signal-to-noise ratiostat.snrfloatTeffEffective temperatureKphys.temperature.effectiveintlogg? Log surface gravitylog(cm.s**-2)phys.gravityfloatnullable[Fe/H]? Metallicity [Fe/H]phys.abund.ZfloatnullableDist? Distancepcpos.distancedoublenullableVarEW[Y/N] Variation in EW_Halphameta.codechar