J/A+A/504/1021ivo://CDS.VizieR/J/A+A/504/1021doi:10.26093/cds/vizier/bc-fr-zxCDSVida K.Olah K.Kovari Zs.Korhonen H.Bartus J.Hurta Zs.,Posztobanyi K.2026-07-01T13:59:29Z2025-09-29T09:24:23ZCDS support team

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

cds-question@unistra.frdwarf-starsmagnetic-fieldsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe investigate the fast-rotating (P_orb_=P_rot_=0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)C and optical spectroscopic data. The light variation is caused by the combined effect of spottedness and binarity with a small eclipse. We estimate the system parameters from the available light and radial velocity curves. Three flare events occurred during the observations: two were found in the spectroscopic data and one was observed photometrically in BV(RI)C colours. An interesting eruptive phenomenon emerged from the photometric measurements that can be interpreted as a series of post-flare eruptions lasting for at least 3 orbits (rotations) of the system, originating from trans-equatorial magnetic loops, which connect the active regions in the two hemispheres. The two components of V405 And have masses well over and below the theoretical limit of full convection. This rare property makes the binary an ideal target for observing and testing models for stellar dynamo action.2009A&A...504.1021Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/504/1021CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/504/1021https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/504/1021http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/504/1021https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/504/1021https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/504/1021http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/504/1021GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 4.920466254354166e-19OpticalInfrareddefaultJ/A+A/504/1021/24BV(RI)_C photometry with the 60cm telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleBmagJohnson B magnitudemagphot.mag;em.opt.BdoubleVmagJohnson V magnitudemagphot.mag;em.opt.VdoubleRcmagCousins R magnitudemagphot.mag;em.opt.RdoubleIcmagCousins I magnitudemagphot.mag;em.opt.IdoubleJ/A+A/504/1021/rccBV(RI)_C photometry with the 1m RCC telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleBmagJohnson B magnitudemagphot.mag;em.opt.BdoubleVmagJohnson V magnitudemagphot.mag;em.opt.VdoubleRcmagCousins R magnitudemagphot.mag;em.opt.RdoubleIcmagCousins I magnitudemagphot.mag;em.opt.Idouble