J/A+A/430/303ivo://CDS.VizieR/J/A+A/430/303doi:10.26093/cds/vizier.34300303CDSCardini D.2017-12-12T14:44:29Z2006-09-21T11:02:48ZCDS support team

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

cds-question@unistra.frlate-type-starsultraviolet-astronomyspectroscopyThe MgIIk emission line is a good indicator of the level of chromospheric activity in late-type stars. We investigate the dependence of this activity indicator on fundamental stellar parameters. To this purpose we use IUE observations of the MgIIk line in 225 late-type stars of luminosity classes I-V, with different levels of chromospheric activity. We first re-analyse the relation between MgIIk line luminosity and stellar absolute magnitude, performing linear fits to the points. The ratio of MgII surface flux to total surface flux is found to be independent of stellar luminosity for evolved stars and to increase with decreasing luminosity for dwarfs. We also analyse the MgIIk line surface flux-metallicity connection.2005A&A...430..303Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/430/303CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/374/1085 : MgII K line Wilson-Bappu relationship (Cassatella+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/430/303https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/430/303http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/430/303https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/430/303https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/430/303http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/430/303GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/430/303/table1 (MgII-K line fluxes for BY Dra stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/430/303/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/430/303/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/430/303/table1?GETtext/xml+votable180.050000true5.7157844-12.20943810.005555555555555556Cone search capability for table J/A+A/430/303/table2 (MgII-K line fluxes for RS CVn stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/430/303/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/430/303/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/430/303/table2?GETtext/xml+votable180.050000true13.2823617-74.65156140.005555555555555556Cone search capability for table J/A+A/430/303/table3 (MgII-K line fluxes for normal stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/430/303/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/430/303/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/430/303/table3?GETtext/xml+votable180.050000true1.653266429.02150170.0055555555555555566/15 137 341-342 373 737 845 924 1033 1077 1603 2017 2133 2282 2317 2339 2837 2973 3020 3026 3077 4146 4444 4559 4574 4591 4699 4990 5074 5109 5245 5522 5535 6166 6219 6241 6740 7402 8133 8790 8843 10375 10380 10490 11764 11856 12009 12155 13778 13947 14035 14126 14391 15165 15217 15243 16834 17219 17266 17425 17551 17608 18139 18204 18889 19912 20102 20286 20311 20328 20518 20753 20886 21177 21328 21523 21612 21731 21738 22015 22707 22964 23191 23342 23369 23503 23527 23533 23538 23545 23547-23548 23560 23695 23960 23996 24151 24420 24799 24877 25246 25304 25407 25452 26302 26320 26521 26575 26975 29009 30965 31130 31132 32891 33201 33243 33281 33287 33797 34392 35069 35150 35480 36233 36248 36317 36697 36759 36762 37907 38095 38168 38259 38718 39095 39284 39714 39893 40078 40321 40784 40795 40823 41118 41295 43046 43141 43842 44015https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/430/303?format=asciiUVdefaultJ/A+A/430/303/table1MgII-K line fluxes for BY Dra starsbin[*] indication of binarity (2)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP numbermeta.id;meta.mainintNameNamemeta.idSpTypeMK spectral typesrc.spTypecharr_SpTypeReference for spectral type (1)meta.bibintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatVMAGAbsolute V magnitudemagphys.magAbs;em.opt.VfloatlogSFlog of the surface MgIIk fluxlog(mW.m**-2)phys.luminosityfloat[Fe/H]? Metallicitylog(Sun)phys.abund.ZfloatnullableNoteNote for double-lined spectra objects (2)(3)meta.notecharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/430/303/table2MgII-K line fluxes for RS CVn starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP numbermeta.id;meta.mainintNameNamemeta.idSpTypeMK spectral type (1)src.spTypecharPerOrbital period (1)dtime.periodfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatVMAGAbsolute V magnitudemagphys.magAbs;em.opt.VfloatlogSFlog of the surface MgII-K fluxlog(mW.m**-2)phys.luminosityfloat[Fe/H]? Metallicitylog(Sun)phys.abund.ZfloatnullableNoteNote for double-lined spectra objects (2)meta.notecharSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/430/303/table3MgII-K line fluxes for normal starsSpTypeMK spectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP numbermeta.id;meta.mainintB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatVMAGAbsolute V magnitudemagphys.magAbs;em.opt.VfloatlogSFlog of the surface MgII-K fluxlog(mW.m**-2)phys.luminosityfloat[Fe/H]? Metallicitylog(Sun)phys.abund.ZfloatnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main