J/A+AS/120/127ivo://CDS.VizieR/J/A+AS/120/127CDSBouvier J.2017-06-21T08:22:29Z2004-01-24T16:38:30ZCDS support team

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

cds-question@unistra.frdwarf-starsinfrared-photometryvisible-astronomyWide-band photometryThe UBVRI light curves of 7 late-type dwarfs amongst the fastest rotators of the Alpha Per cluster (vsini>=140km/s) are presented. The shape of the light curves suggests that the photometric variations are most often dominated by a single group of cool spots located at intermediate or high latitude on the stellar surface. Assuming that starspots are good tracers of the stellar magnetic field, the smooth light curves indicate the existence of a large scale, slowly varying magnetic structure at the surface of these ultrafast rotators. For a description of the UBVRI photometric system, see e.g. <GCPD/08>1996A&AS..120..127Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/120/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/120/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/120/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/120/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/120/127https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/120/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/120/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/120/127/stars (List of stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/120/127/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/120/127/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/120/127/stars?GETtext/xml+votable180.050000true49.98916749.8686110.0055555555555555566/1742 1769 1771 3093 3095 3144https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/120/127?format=asciiOpticalInfrareddefaultJ/A+AS/120/127/starsList of starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnameName of star in alpha Per (Mel 20), as in tablemeta.id;meta.maincharprimaryRAJ2000Right Ascension J2000 (hours) (1)pos.eq.ra;meta.mainDEJ2000Declination J2000 (degrees) (1)pos.eq.dec;meta.mainVmagMean visual magnitude (1) (1)magphot.mag;em.opt.VfloatVnameVariable name (1)meta.idcharJ/A+AS/120/127/tableUBVRI photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnameStar namemeta.id;meta.maincharHJDHeliocentric Julian datedtime.epochdoubleMagDifferential magnitudemagphot.magdoublee_Magrms error on the magnitudemagstat.errordoubleColor[UBVRI] Filtermeta.code;instr.filterchar