J/A+A/590/A45ivo://CDS.VizieR/J/A+A/590/A45doi:10.26093/cds/vizier.35900045CDSLorenzo J.Negueruela I.Vilardell F.Simon-Diaz S.Pastor P.,Mendez Majuelos M.2017-06-02T08:37:23Z2016-05-10T08:10:31ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsearly-type-starsvisible-astronomybroad-band-photometryWe present a comprehensive analysis, including B and V light curves and 11 high-resolution spectra, to verify the orbital period and determine parameters. The spectroscopic and photometric analyses agree on a period of 0.896640+/-0.000007d. We determine a mass of 9.0+/-0.6M_{sun}_ for each component and temperatures of 28000+/-2000K. Both values are consistent with the spectral type B1V. The two stars are overfilling their respective Roche lobes, sharing a common envelope, and therefore the orbit is synchronised and circularised. Thetwo stars are in a very advanced stage of interaction, with their extreme physical similarity likely due to the common envelope. The expected evolution of such a system will very probably lead to a merger while still on the main sequence.2016A&A...590A..45Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/590/A45CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/590/A45https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/590/A45http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/590/A45https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/590/A45https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/590/A45http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/590/A45GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/590/A45/vmagGU Mon photometric data in V bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[2454874/2454884] Heliocentric Julian datedtime.epochdoubleVmagV magnitudephot.mag;em.opt.VfloatJ/A+A/590/A45/bmagGU Mon photometric data in B bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[2457005/2457088] Heliocentric Julian datedtime.epochdoubleBmagB magnitudephot.mag;em.opt.Bfloat