J/A+A/520/A89ivo://CDS.VizieR/J/A+A/520/A89doi:10.26093/cds/vizier.35200089CDSMayer P.Harmanec P.Wolf M.Bozic H.Slechta M.2020-08-06T16:19:54Z2010-10-08T09:15:15ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryFor years, {delta} Ori was considered a normal binary with an O9.5 II primary exhibiting apsidal-line advance. However, in 2002 radial-velocity curves of both binary components derived from the IUE and optical spectra using the cross-correlation technique have been published by Harvin et al. (2002ApJ...565.1216H); surprisingly low masses of 11.2 and 5.6M_{sun}_ were obtained. We obtained new spectra in the red spectral region and new UBV photometry. Using all published photometry and radial velocities, we deduced more accurate orbital and apsidal line periods. The main result of this paper is to show that the observed line spectra of {delta} Ori are composed of the lines of the O9.5 II primary and a similarly hot tertiary, while the lines of a cooler B-type secondary are too faint to be detected in the available spectra. The character of the light curve (low-amplitude partial eclipses and a non-negligible scatter of the data) does not allow for a unique light-curve solution. Nevertheless, we show that the assumption of normal primary-component mass and radius corresponding to the O9.5 II classification (25M_{sun}_, 16-17R_{sun}_) leads to consistent parameters for the system.2010A&A...520A..89Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/520/A89CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/520/A89https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/520/A89http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/520/A89https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/520/A89https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/520/A89http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/520/A89GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 6.118840631666147e-19OpticalInfrareddefaultJ/A+A/520/A89/rvCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoublen_RVmeta.notecharRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloatSource[1/16] Source, in tablea1.dat filemeta.bibintcode[1] "1" means primary componentmeta.codeintJ/A+A/520/A89/tablea1Journal of available RV observationsRefReferencemeta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSource[1/16] Source numbermeta.idintprimaryHJD1Time interval, HJD-2400000dtime.epochfloatHJD2Time interval, HJD-2400000dtime.epochfloatNRVNumber of RV measurementsmeta.numberintTelTelescope and instrumentinstrcharJ/A+A/520/A89/table24Photometry of Johnson et al. (1966, CoLPL, 4, 99) green and bluerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleVmagV magnitudemagphot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.BfloatV-RV-R colour indexmagphot.color;em.opt.V;em.opt.RfloatR-IR-I colour indexmagphot.color;em.opt.R;em.opt.IfloatWeightsWeights for UBVRI bandsstat.weightintXAir massobs.airMassfloatGJDGeocentric Julian datedtime.epochdoubleJ/A+A/520/A89/table27HIPPARCOS photometry, Perryman et al. (1997, I/239)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleHpHIP magnitudemagphot.mag;em.opt.VfloatV(Hp)V magnitude transformed from HIPmagphot.mag;em.opt.VfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloate_Hprms uncertainty on Hpmagstat.errorfloatFlag[0/1] Flagmeta.code.errorintJ/A+A/520/A89/table28This paper, {delta} Ori UBV photometry made at HvarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleVmagV magnitudemagphot.mag;em.opt.VfloatBmagB magnitudemagphot.mag;em.opt.BfloatUmagU magnitudemagphot.mag;em.opt.UfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.BfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloatXAir massobs.airMassfloatdXDifference of air mass "var minus comp"obs.airMassfloatJ/A+A/520/A89/table2eThis paper, {epsilon} Ori UBV photometry made at HvarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleVmagV magnitudemagphot.mag;em.opt.VfloatBmagB magnitudemagphot.mag;em.opt.BfloatUmagU magnitudemagphot.mag;em.opt.UfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.VfloatU-BU-B colour indexmagphot.color;em.opt.U;em.opt.BfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloatXAir massobs.airMassfloatdXDifference of air mass "var minus comp"obs.airMassfloatJ/A+A/520/A89/table2aPhotometry by Stebbins (1915ApJ....42..133S), Storer (1930PASP...42..291S), Worley (1955PASP...67..330W) and Koch & Hrivnak (1981ApJ...248..249K),recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoublemagMagnitudemagphot.magfloatWeightWeight of the data pointstat.weight;phys.atmol.weightfloatSource[1/10] Source (1)meta.idintBand[3/4] 3: V or green magnitude, 4: blue magnitudeinstr.bandpassint