Sun chromospheric CaII-HK emissionJ/A+A/552/A114ivo://CDS.VizieR/J/A+A/552/A114doi:10.26093/cds/vizier.35520114CDSShapiro A.I.Sch,utz W.Cessateur G.Rozanov E.2017-06-01T08:52:19Z2013-04-17T10:13:29ZCDS support team
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
cds-question@unistra.frthe-sunastronomical-modelsMonitoring of the photometric and chromospheric HK emission data series of stars similar to the Sun in age and average activity level showed that there is an empirical correlation between the average stellar chromospheric activity level and the photometric variability. In general, more active stars show larger photometric variability. Interestingly, the measurements and reconstructions of the solar irradiance show that the Sun is significantly less variable than indicated by the empirical relationship. We aim to identify possible reasons for the Sun to be currently outside of this relationship. We employed different scenarios of solar HK emission and irradiance variability and compared them with available time series of Sun-like stars.2013A&A...552A.114Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/552/A114CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/309/655 : Solar chromospheric activity (HeI 10830A) (Shcherbakov+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/552/A114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/552/A114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/552/A114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/552/A114https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/552/A114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/552/A114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/552/A114/table1Variability long-term V_LT_=0%, V_11_=0.00044mag, no secular changes of the chromospheric activity (upper-left panel in Fig. 3);recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar
J/A+A/552/A114/table2Variability long-term V_LT_=0.044%, V_11_=0.00044mag, strong changes of the chromospheric activity (upper-right panel in Fig. 3);recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar
J/A+A/552/A114/table3Variability long-term V_LT_=0.17%, V_11_=0.00044mag, strong changes of the chromospheric activity (middle-left panel in Fig. 3);recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar
J/A+A/552/A114/table4Variability long-term V_LT_=0.17%, V_11_=0.00044mag, no secular changes of the chromospheric activity (middle-right panel in Fig. 3);recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar
J/A+A/552/A114/table5Variability long-term V_LT_=0.5%, V_11_=0.00044mag, strong changes of the chromospheric activity (lower-left panel in Fig. 3);recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar
J/A+A/552/A114/table6Variability long-term V_LT_=0.5%, V_11_=0.0002mag, no secular changes of the chromospheric activity (lower-right panel in Fig. 3).recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogR'HKMean over last 9000 years chromospheric activityphot.flux;arith.ratiodoubleVar? Variability Stromegren indices, log(rms(b+y)/2phot.mag;stat.meandoublenullablen_Var[i] i for -{infinity} (i.e. Var=0)meta.notechar