J/ApJ/809/134ivo://CDS.VizieR/J/ApJ/809/134doi:10.26093/cds/vizier.18090134CDSPablo H.Richardson N.D.Moffat A.F.J.Corcoran M.Shenar T.,Benvenuto O.Fuller J.Naze Y.Hoffman J.L.Miroshnichenko A.,Apellaniz J.M.Evans N.Eversberg T.Gayley K.Gull T.Hamaguchi K.,Hamann W.-R.Henrichs H.Hole T.Ignace R.Iping R.Lauer J.,Leutenegger M.Lomax J.Nichols J.Oskinova L.Owocki S.Pollock A.,Russell C.M.P.Waldron W.Buil C.Garrel T.Graham K.Heathcote B.,Lemoult T.Li D.Mauclaire B.Potter M.Ribeiro J.Matthews J.,Cameron C.Guenther D.Kuschnig R.Rowe J.Rucinski S.Sasselov D.,Weiss W.2017-07-03T14:25:23Z2016-01-14T13:17:57ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsradial-velocityob-starsWe report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system {delta} Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P=5.7days, and a more distant tertiary (O9IV P>400 years). This data was collected in concert with X-ray spectroscopy from the Chandra X-ray Observatory. Thanks to continuous coverage for three weeks, the MOST light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.2015ApJ...809..134Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/809/134CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/274 : Galactic O-Star Spectroscopic Survey (Sota+, 2014)II/7 : UBVRIJKLMNH Photoelectric Catalogue (Morel+ 1978)J/ApJS/215/15 : SMaSH+: observations and companion detection (Sana+, 2014)J/AJ/147/123 : Speckle interferometry with SOAR, 2012-2013 (Tokovinin+, 2014)J/A+A/563/A59 : KIC 3858884: list of pulsation frequencies (Maceroni+, 2014)J/MNRAS/433/1300 : HD 165052 radial-velocity measurements (Ferrero+, 2013)J/A+A/533/A4 : CoRoT photometry of three O-type stars (Blomme+, 2011)J/A+A/520/A89 : Multi-epoch photometry of {delta} Ori (Mayer+, 2010)J/A+A/518/A1 : Galactic massive stars with AstraLux (Maiz Apellaniz, 2010)J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)J/A+A/485/931 : Young stars and brown dwarfs in Ori OB1b (Caballero+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/809/134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/809/134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/809/134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/809/134https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/809/134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/809/134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/809/134/table1{delta} Ori observing logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObserverobs.observercharNobs[2/201] Number of observationsmeta.numberintTelTelescopemeta.id;instr.telcharSpecSpectrographmeta.id;instrcharCCDCCDmeta.id;instrcharR[11000/65000] Resolutionspect.resolutionintJ/ApJ/809/134/table2Radial velocity light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[6245.5/6300.7] Heliocentric Julian Date; HJD-2450000dtime.epochdoubleRVel[-97.8/113.8] Radial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVel[0.7/25] Error in RVelkm/sstat.error;spect.dopplerVelocfloat