J/A+A/637/A13ivo://CDS.VizieR/J/A+A/637/A13doi:10.26093/cds/vizier.36370013CDSMuheki P.Guenther E..W.Mutabazi T.Jurua E.2020-07-22T13:08:36Z2020-05-05T08:13:48ZCDS support team

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

cds-question@unistra.frmultiple-starsm-starsvisible-astronomyspectroscopyFlares and coronal mass ejections (CMEs) are important for the evolution of the atmospheres of planets and their potential habitability, particularly for planets orbiting M stars at a distance <0.4AU. Detections of CMEs on these stars have been sparse, and previous studies have therefore modelled their occurrence frequency by scaling up solar relations. However, because the topology and strength of the magnetic fields on M stars is different from that of the Sun, it is not obvious that this approach works well. We used a large number of high-resolution spectra to study flares, CMEs, and their dynamics of the active M dwarf star AD Leo. The results can then be used as reference for other M dwarfs. We obtained more than 2000 high-resolution spectra (R~35000) of the highly active M dwarf AD Leo, which is viewed nearly pole on. Using these data, we studied the behaviour of the spectral lines H{alpha}, H{beta}, and HeI 5876 in detail and investigated asymmetric features that might be Doppler signatures of CMEs. We detected numerous flares. The largest flare emitted 8.32x10^31^erg in H{beta} and 2.12x10^32^erg in H{alpha}. Although the spectral lines in this and other events showed a significant blue asymmetry, the velocities associated with it are far below the escape velocity. Although AD Leo shows a high level of flare activity, the number of CMEs is relatively low. It is thus not appropriate to use the same flare-to-CME relation for M dwarfs as for the Sun.2020A&A...637A..13Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/637/A13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/637/A13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/637/A13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/637/A13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/637/A13https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/637/A13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/637/A13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/637/A13/list (List of spectra files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/637/A13/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/637/A13/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/637/A13/list?GETtext/xml+votable180.050000true154.901166719.870.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/637/A136/4444https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/637/A13?format=asciiOpticaldefaultJ/A+A/637/A13/listList of spectra filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintspShow the spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar