J/A+A/337/183ivo://CDS.VizieR/J/A+A/337/183doi:10.26093/cds/vizier.33370183CDSBolton C.T.Harmanec P.Lyons R.W.Odell A.P.Pyper D.M.1998-09-12T13:51:56Z1998-09-12T13:51:28ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsvisible-astronomymedium-band-photometryradial-velocityWe report on a detailed spectroscopic and photometric study of V1046 Orionis undertaken to resolve uncertainties about the period(s) and causes of the spectroscopic and photometric variations of this helium-strong star. We have detected the lines of the secondary star in an extensive series of photographic and electronic spectra. This eliminates any doubt about the duplicity of this star. The orbital elements we derive from our measures of these spectra confirm the unusually large orbital eccentricity, e=0.433, for the short, P=18.65612d, orbital period. The line profiles, V/R ratio of the double H{alpha} emission, residuals of the primary radial velocities from the orbital velocity curve, brightness and colour of the object, magnetic field, and radio emission of this system all vary with a period of 0.9011836d. We tentatively follow earlier investigators in interpreting this as the rotational period of the primary and summarize the evidence of the phase shifts among the different phenomena, using the accurate value of the 0.9d period, to put tight constraints on any future model of these changes. We postpone our own attempt at a quantitative modelling of the variations with the 0.9d period for a separate study.1998A&A...337..183Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/337/183CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/337/183https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/337/183http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/337/183https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/337/183https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/337/183http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/337/183GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/337/183/table5V1046 Ori radial velocities measured on David Dunlap photographic spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleRV1(H+He)Measured radial velocity for mean H+Hekm/sphys.veloc;pos.heliocentricfloatRV1(HeI)Measured radial velocity for HeIkm/sphys.veloc;pos.heliocentricfloatRV1(He416.9)? Measured radial velocity for He 416.9km/sphys.veloc;pos.heliocentricfloatnullableRV2(MgII)? Measured radial velocity for Mg IIkm/sphys.veloc;pos.heliocentricfloatnullableRV(CaII)? Measured radial velocity for Ca IIkm/sphys.veloc;pos.heliocentricfloatnullableFWHMFull widths at half maximum of He 447.1nmspect.line.widthfloatIcCentral intensity of He 447.1spect.line.intensity;arith.ratiofloatEWEquivalent width of He 447.1nmspect.line.eqWidthfloatJ/A+A/337/183/table3V1046 Ori individual uvby photometric observations from several stationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julina datedtime.epochdoubleymagy magnitudemagphot.mag;em.opt.Vfloatbmag? b magnitudemagphot.mag;em.opt.Bfloatnullableumagu magnitudemagphot.mag;em.opt.Ufloatvmag? v magnitudemagphot.mag;em.opt.Vfloatnullableb-v? b-v colour indexmagphot.colorfloatnullableu-b? u-b colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablec1? c1 colour indexmagphot.colorfloatnullablem1? m1 colour indexmagphot.colorfloatnullableObsObserving station code (1)meta.id;instr.obstyint