J/AJ/143/5ivo://CDS.VizieR/J/AJ/143/5doi:10.26093/cds/vizier.51430005CDSSowell J.R.Henry G.W.Fekel F.C.2017-06-19T07:56:58Z2013-04-05T14:10:37ZCDS support team

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

cds-question@unistra.frvisible-astronomymedium-band-photometryeclipsing-binary-starsf-starslate-type-starsradial-velocityWe have obtained Stromgren b and y differential photometric observations of the solar-type eclipsing binary HD 74057 plus follow-up high-resolution, red wavelength spectroscopic observations. The system has an orbital period of 31.2198 days, a high eccentricity of 0.47, and is seen almost exactly edge on with an inclination of 89.8{deg}. The two main-sequence G0 stars are nearly identical in all physical characteristics. We used the Wilson-Devinney program to obtain a simultaneous solution of our photometric and spectroscopic observations. The resulting masses of the components are M1=1.138+/-0.003M_{sun}_ and M2=1.131+/-0.003M_{sun}_, and the radii are R1=1.064+/-0.002R_{sun}_ and R2=1.049+/-0.002R_{sun}_. The effective temperatures are 5900K (fixed) and 5843K, and the iron abundance, [Fe/H], is estimated to be +0.07. A comparison with evolutionary tracks suggests that the system may be even more metal rich. The components rotate with periods of 8.4 days, significantly faster than the predicted pseudosynchronous period of 12.7days. We see evidence that one or both components have cool spots. Both stars are close to the zero-age main sequence and are about 1.0Gyr old.2012AJ....143....5Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/143/5CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/215 : uvby-beta Catalogue (Hauck+ 1997)II/291 : Third Photometric Magnitude Difference Catalog (Mason, 2008)J/A+A/387/850 : Radial velocities of eclipsing binaries (Imbert, 2002)J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/143/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/143/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/143/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/143/5https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/143/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/143/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/143/5/table1Photometric observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[52196.9/53510.7] Heliocentric Julian Date; (HJD-2400000.0)dtime.epochdoublePhasePhase (1)time.phasefloatDymag[0.974/1.725] Differential y band magnitudemagphot.mag;arith.difffloatDbmag[1.082/1.845] Differential b band magnitudemagphot.mag;arith.difffloatJ/AJ/143/5/table2Radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[52327.8/54223.7] Heliocentric Julian Date; (HJD-2400000)dtime.epochdoublePhasePhase (1)time.phasefloatRV1[-34.5/64.5] Primary radial velocitieskm/sspect.dopplerVelocfloatO-C1[-0.5/0.4] Primary O-C residuals (1)km/sstat.fit.residual;stat.fit.omcfloatRV2[-55.6/44.7] Secondary radial velocitieskm/sspect.dopplerVelocfloatO-C2[-0.3/0.4] Secondary O-C residuals (1)km/sstat.fit.residual;stat.fit.omcfloat