J/ApJ/869/37ivo://CDS.VizieR/J/ApJ/869/37doi:10.26093/cds/vizier.18690037CDSGordon K.D.Gies D.R.Schaefer G.H.Huber D.Ireland M.Hillier D.J.2020-04-08T08:53:57Z2019-12-27T14:54:29ZCDS support team

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

cds-question@unistra.frinterferometryo-starsvisible-astronomyWe present interferometric observations of six O-type stars that were made with the Precision Astronomical Visible Observations beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array. The observations include multiple brackets for three targets, {lambda} Ori A, {zeta} Oph, and 10 Lac, but there are only preliminary, single observations of the other three stars, {xi} Per, {alpha} Cam, and {zeta} Ori A. The stellar angular diameters range from 0.55mas for {zeta} Ori A down to 0.11mas for 10 Lac, the smallest star yet resolved with the CHARA Array. The rotational oblateness of the rapidly rotating star {zeta} Oph is directly measured for the first time. We assembled ultraviolet to infrared flux measurements for these stars, and then derived angular diameters and reddening estimates using model atmospheres and an effective temperature set by published results from analysis of the line spectrum. The model-based angular diameters are in good agreement with those observed. We also present estimates for the effective temperatures of these stars, derived by setting the interferometric angular size and fitting the spectrophotometry.2018ApJ...869...37Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/869/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/224 : Catalogue of Stellar Diameters (CADARS) (Pasinetti- Fracassini+ 2001)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)II/346 : JMMC Stellar Diameters Catalogue - JSDC. Version 2 (Bourges+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)J/A+A/457/637 : UBVJHK synthetic photom. of Galactic O stars (Martins+, 2006)J/A+A/507/833 : Interstellar CaII lines for 290 stars (Megier+, 2009)J/ApJS/191/301 : Spitzer Atlas of Stellar Spectra (SASS) (Ardila+, 2010)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)J/AJ/153/16 : Calibrator stars catalog for interferometers (Swihart+, 2017)J/A+A/613/A65 : Spectroscopic parameters of O-type stars (Holgado+, 2018)J/A+A/613/A9 : Extinction towards Galactic O stars (Maiz Apellaniz +, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/869/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/869/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/869/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/869/37https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/869/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/869/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/869/37/table1 (Parameters of target stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/37/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/37/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/37/table1?GETtext/xml+votable180.050000true59.741259435.79103140.0055555555555555566/1558 3430 13557 22854 23717 30818https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/869/37?format=asciiOpticaldefaultJ/ApJ/869/37/table1Parameters of target starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDInternal identifiermeta.idcharNameStar namemeta.idcharHD[24912/214680] HD numbermeta.id;meta.mainintprimarySpTSpectral type (1)src.spTypecharVmag[1.8/4.9] V-band magnitudemagphot.mag;em.opt.VfloatB-V[-0.3/0.05] B-V color indexmagphot.color;em.opt.B;em.opt.VfloatV-K[-0.7/0.2] V-K color indexmagphot.color;em.opt.V;em.IR.KfloatTeff[29.4/35.5] Effective temperature (2)kKphys.temperature.effectivefloate_Teff[0.5/1.3] Teff uncertaintykKstat.error;phys.temperature.effectivefloatlogg[3/4] log of surface gravity (2)log(cm.s**-2)phys.gravityfloate_logg[0.08/0.3] logg uncertaintylog(cm.s**-2)stat.errorfloatvsini[16/311] Projected rotational velocity from Simon-Diaz+ 2014, J/A+A/562/A135km/sphys.veloc.rotatintVCVisibility interactive plotmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/869/37/table5Calibrated visibilitiesTPairTelescope pairinstr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD[24912/214680] HD numbermeta.id;meta.mainintMJD[56602/57934] Modified Julian Date of observation, JD-2400000.5dtime.epochintSFreq[200.02/505.62] Spatial frequency (1)rad**-1obs.paramfloatu[-2254.67/2253.56] u-coordinatearcsec**-1obs.paramdoublev[-2450.3/2174.94] v-coordinatearcsec**-1obs.paramdoubleB[158.72/330.47] Baselineminstr.baselinefloatV2[0.016/1.246] Visibility squaredobs.paramfloate_V2[0.004/0.464] Uncertainty in visibility squaredstat.errordouble