J/A+A/404/L29ivo://CDS.VizieR/J/A+A/404/L29doi:10.26093/cds/vizier.34049029CDSPaardekooper S.J.Van der Hucht K.Avan Genderen A.Brogt E.,Gieles M.Meijerink R.2017-06-21T08:22:37Z2003-08-02T22:36:55ZCDS support team

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

cds-question@unistra.frmultiple-starswolf-rayet-starsvisible-astronomybroad-band-photometryWe present new photometric observations in Johnson V and B of WR30a, revealing relative dramatic changes in brightness of 0.2mag. These variations occur on a time scale of hours, and are only seen in V. We argue that they are not caused by dust extinction, but either by a dramatic change in the strength of the C IV 5801-12{AA} emission line doublet due to a de-excitation process, or by some unknown continuum effect.2003A&A...404..L29Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/404/L29CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/404/L29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/404/L29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/404/L29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/404/L29https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/404/L29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/404/L29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/404/L29/table2Brogt (02-22/07/01) V light curve (Set I)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2450000Heliocentric Julian Date - 2450000dtime.epochdoubledeltaVDifferential V magnitudemagphot.mag;arith.diffdoubledeltaBDifferential B magnitudemagphot.mag;arith.diffdoubleJ/A+A/404/L29/table3Meijerink (30/10-15/11/01) V light curve (Set II)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2450000Heliocentric Julian Date - 2450000dtime.epochdoubledeltaVDifferential V magnitudemagphot.mag;arith.diffdoubledeltaBDifferential B magnitudemagphot.mag;arith.diffdoubleJ/A+A/404/L29/table4Gieles (15/11-15/12/01) V light curve (Set III)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2450000Heliocentric Julian Date - 2450000dtime.epochdoubledeltaVDifferential V magnitudemagphot.mag;arith.diffdoubledeltaBDifferential B magnitudemagphot.mag;arith.diffdouble