J/A+A/362/223ivo://CDS.VizieR/J/A+A/362/223doi:10.26093/cds/vizier.33620223CDSJetsu L.Hackman T.Hall D.S.Henry G.W.Kokko M.You J.2000-10-29T20:13:25Z2000-10-29T21:13:19ZCDS support team

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

cds-question@unistra.frvariable-starsvisible-astronomybroad-band-photometryAs a case study of the solar-stellar connection, we have analysed a prolonged time series of BV photometry of the chromospherically active binary V815 Her. The surface differential rotation in the rapidly rotating G5V primary caused changes of 4.6% in the seasonal photometric rotation periods. This would imply a differential rotation coefficient of k=0.184, if the rotation of the starspots follow the solar law of differential rotation and the activity is confined within the same latitudinal range as in the Sun, having k=0.189 and the spectral type G2V. Our analysis of the primary and secondary minima of the seasonal light curves indicated that the regions of stronger activity have concentrated on one active longitude, which has maintained a constant rotation period of 1.79244d for about 14 years. No regular activity cycle was detected in the mean brightness changes of V815 Her.2000A&A...362..223Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/362/223CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/350/513 : V368 Cep UBVRI time series (Kahanpaa+, 1999)J/A+AS/139/513 : 1975-1995 V1794 Cyg UBVRI photometry (Jetsu+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/362/223https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/362/223http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/362/223https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/362/223https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/362/223http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/362/223GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/362/223/table1V and B V815 Her differential magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSETSubset number ( a total of 98 subsets)meta.idintHJDHeliocentric Julian datedtime.epochdoubleBmag? V815 Her minus HD 166093 magnitude difference in the standard Johnson B systemmagphot.mag;arith.difffloatnullableVmag? V815 Her minus HD 166093 magnitude difference in the standard Johnson V systemmagphot.mag;arith.difffloatnullable