J/MNRAS/476/908ivo://CDS.VizieR/J/MNRAS/476/908doi:10.26093/cds/vizier.74760908CDSFang X.-S.Zhao G.Zhao J.-K.Bharat Kumar Y.2024-08-18T20:18:52Z2021-05-31T13:09:27ZCDS support team

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

cds-question@unistra.fropen-star-clusterslate-type-starsline-intensitiesWe use the LAMOST spectra of member stars in Pleiades, M34, Praesepe, and Hyades to study how chromospheric activity varies as a function of mass and rotation at different age. We measured excess equivalent widths of H{alpha}, H{beta}, and CaII K based on estimated chromospheric contributions from old and inactive field dwarfs, and excess luminosities are obtained by normalizing bolometric luminosity, for more than 700 late-type stars in these open clusters. Results indicate two activity sequences in cool spot coverage and H{alpha} excess emission among GK dwarfs in Pleiades and M dwarfs in Praesepe and Hyades, paralleling with well-known rotation sequences. A weak dependence of chromospheric emission on rotation exists among ultrafast rotators in saturated regime with Rossby number Ro<=0.1. In the unsaturated regime, chromospheric and coronal emission show similar dependence on Ro, but with a shift towards larger Ro, indicating chromospheric emission gets easily saturated than coronal emission, and/or convective turnover time-scales based on X-ray data do not work well with chromospheric emission. More interestingly, our analysis shows fully convective slow rotators obey the rotation-chromospheric activity relation similar to hotter stars, confirming the previous finding. We found correlations among H{alpha}, H{beta}, and CaII K emissions, in which H{alpha} losses are more important than CaII K for cooler and more active stars. In addition, a weak correlation is seen between chromospheric emission and photospheric activity that shows dependence on stellar spectral type and activity level, which provides some clues on how spot configuration varies as a function of mass and activity level.2018MNRAS.476..908Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/476/908CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/153 : LAMOST DR4 catalogs (Luo+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/476/908https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/476/908http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/476/908https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/476/908https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/476/908http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/476/908GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/476/908/tablef1 (Measurements for stars in Pleiades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/908/tablef1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/908/tablef1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/908/tablef1?GETtext/xml+votable180.050000true52.2002488925.575841940.005555555555555556Cone search capability for table J/MNRAS/476/908/tablef2 (Measurements for stars in M34)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/908/tablef2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/908/tablef2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/908/tablef2?GETtext/xml+votable180.050000true40.3968961142.684016940.005555555555555556Cone search capability for table J/MNRAS/476/908/tablef3 (Measurements for stars in Praesepe)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/908/tablef3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/908/tablef3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/908/tablef3?GETtext/xml+votable180.050000true125.50758520.326776110.005555555555555556Cone search capability for table J/MNRAS/476/908/tablef4 (Measurements for stars in Hyades)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/908/tablef4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/908/tablef4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/908/tablef4?GETtext/xml+votable180.050000true33.1205419428.995778060.0055555555555555565/112 114-116 118 121 124 126 1174 1177 1180 5886-5887 6/95 211 319-321 324-325 327 334 336 339-341 344-345 348-349 351 357-359 362 368-369 371 377-378 380-382 405 407 413 437 439 454-455 469-471 476 478-479 481-483 489 491-494 500 503 508 510-511 528 608 729 766 795 803 820 823 833 836-837 849 852 879 889 917 924 989 1009 1020 1026 1029 1031-1032 1035 1037 1041 1044 1046 1049-1051 1064 1066 1075 1094 1152 1154 1158-1162 1167 1180 1184-1186 1193-1194 1199 1210-1211 1239 1554 1564 1567 2139 2395 4335 4675 4677 4679-4680 4685 4687 4690-4692 4694-4695 4700-4702 4705 4715-4716 4724-4726 4729 4732 4866 4872 4896 23256 23282 23286 23368 23375 23386 23399 23419 23487 23507 23518 23531 23534-23536 23542 23663 23721 23789 23794 24067 24123 24202 24208 24210 24224-24225 24228-24229 24233 24235 24238 24241 24244 24252 24256 24298 24319 24344 24363 24491 24552https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/476/908?format=asciidefaultJ/MNRAS/476/908/tablef1Measurements for stars in PleiadesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar designationmeta.id;meta.maincharTeffEffective (quiescent) temperatureKphys.temperature.effectiveintEWHa? Equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEWHb? Equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEWCaK? Equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableEW'Ha? Excess equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEW'Hb? Excess equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEW'CaK? Excess equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableR'Ha? Fractional excess luminosity of Halpha (1)phys.luminosity;arith.ratiodoublenullableR'Hb? Fractional excess luminosity of Hbeta (1)phys.luminosity;arith.ratiodoublenullableR'CaK? Fractional excess luminosity of Ca IIK (1)phys.luminosity;arith.ratiodoublenullablefs? Spot filling factor (based on TiO2)stat.fit.paramdoublenullableTspot? Spot temperatureKphys.temperatureintnullablemultiPhotometric single/binary member/non-member (2)meta.codeintRAJ2000Right ascension J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainJ/MNRAS/476/908/tablef2Measurements for stars in M34SimbadNameSimbad column added by the CDSmeta.idcharnullableEWHb? Equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEWCaK? Equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableEW'Ha? Excess equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEW'Hb? Excess equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEW'CaK? Excess equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableR'Ha? Fractional excess luminosity of Halpha (1)phys.luminosity;arith.ratiodoublenullableR'Hb? Fractional excess luminosity of Hbeta (1)phys.luminosity;arith.ratiodoublenullableR'CaK? Fractional excess luminosity of Ca IIK (1)phys.luminosity;arith.ratiodoublenullablefs? Spot filling factor (based on TiO2)stat.fit.paramdoublenullableTspot? Spot temperatureKphys.temperatureintnullablemultiPhotometric single/binary member/non-member (2)meta.codeintRAJ2000Right ascension J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar designationmeta.id;meta.maincharTeffEffective (quiescent) temperatureKphys.temperature.effectiveintEWHa? Equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableJ/MNRAS/476/908/tablef3Measurements for stars in PraesepeSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar designationmeta.id;meta.maincharTeffEffective (quiescent) temperatureKphys.temperature.effectiveintEW'CaK? Excess equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableR'Ha? Fractional excess luminosity of Halpha (1)phys.luminosity;arith.ratiodoublenullableR'Hb? Fractional excess luminosity of Hbeta (1)phys.luminosity;arith.ratiodoublenullableR'CaK? Fractional excess luminosity of Ca IIK (1)phys.luminosity;arith.ratiodoublenullablefs? Spot filling factor (based on TiO2)stat.fit.paramdoublenullablemultiPhotometric single/binary member/non-member (2)meta.codeintRAJ2000Right ascension J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainEWHa? Equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEWHb? Equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEWCaK? Equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableEW'Ha? Excess equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEW'Hb? Excess equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableTspot? Spot temperatureKphys.temperatureintnullableJ/MNRAS/476/908/tablef4Measurements for stars in HyadesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar designationmeta.id;meta.maincharTeffEffective (quiescent) temperatureKphys.temperature.effectiveintEWHa? Equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEWHb? Equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEWCaK? Equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableEW'Ha? Excess equivalent width of Halpha line0.1nmspect.line.eqWidthdoublenullableEW'Hb? Excess equivalent width of Hbeta line0.1nmspect.line.eqWidthdoublenullableEW'CaK? Excess equivalent width of Ca II K line0.1nmspect.line.eqWidthdoublenullableR'Ha? Fractional excess luminosity of Halpha (1)phys.luminosity;arith.ratiodoublenullableR'Hb? Fractional excess luminosity of Hbeta (1)phys.luminosity;arith.ratiodoublenullableR'CaK? Fractional excess luminosity of Ca IIK (1)phys.luminosity;arith.ratiodoublenullablefs? Spot filling factor (based on TiO2)stat.fit.paramdoublenullableTspot? Spot temperatureKphys.temperatureintnullablemultiPhotometric single/binary member/non-member (2)meta.codeintRAJ2000Right ascension J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.main