J/A+A/415/289ivo://CDS.VizieR/J/A+A/415/289doi:10.26093/cds/vizier.34150289CDSHarmanec P.Bozic H.Thanjavur K.Robb R.M.Ruzdjak D.Sudar D.2017-06-13T11:08:32Z2004-04-19T08:42:43ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryNew photoelectric UBV and BVRI observations, secured during August-November of 2002 at two observatories distant in local time are analyzed together with two earlier photometric data sets and all available radial velocities to derive the most accurate ephemeris of the binary and to set limits on its basic physical elements. These observations were obtained as a support for a high-dispersion spectroscopic study, results of which will be published separately. It was found that radial velocities and photometric observations spanning 53 years can be reconciled with the linear ephemeris T_(prim.min.)_=HJD 2440182.25628(46) + 0.698095113(29)days x E, where the rms errors of the last digits are given in brackets. Masses of the stars are 1.02 and 0.97 solar masses and the binary separation is 4.170 solar radii. There is still a large uncertainty in the stellar radii. We also report the discovery of rapid light variations on a time scale of hours seen in the U band light curve and offer a few thoughts on the future investigation of this binary.2004A&A...415..289Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/415/289CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/402/745 : Radial velocities of ER Vul (Duemmler+, 2003)J/AN/323/31 : UBVR light curves of ER Vul and RT And (Ekmekci+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/415/289https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/415/289http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/415/289https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/415/289https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/415/289http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/415/289GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/415/289/table4Heliocentric Julian dates, (U,B,V,R,I) magnitudes and weights of photometric observations of ER VulHJDHeliocentric Julian date of observationtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[VBURI] Bandmeta.code;instr.filtercharmagMagnitude in Band (V, B, U, R, I)magphot.magfloatwweight of observationstat.weightfloatCodeNumerical code for magnitude and station (1)meta.id;instr.obstyint