J/A+AS/122/515ivo://CDS.VizieR/J/A+AS/122/515CDSZhang R.X.Fang M.J.Zhai D.S.1997-12-09T18:34:39Z1997-12-09T19:34:34ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsephemeridesPhotoelectric observations of HL Aur were carried out with the 60cm reflector of Beijing Astronomical Observatory in 1990 and 1994, and the first photoelectric BV light curves were obtained along with a newly derived ephemeris. The period of the system appears to be constant over the past 65-years. Using the Wilson-Devinney program a photometric analysis of the B and V light curves is performed. It is evident that HL Aur is a near-contact binary with a mass ratio of q=m_2_/m_1_=0.722+/-0.011. The primary component of the system is essentially in contact with its Roche lobe, while the secondary is detached but nearly in contact with its lobe. It is found that the components of the system are slightly evolved and located near the terminal-age main sequence. The binary is consistent with the general evolutionary picture for near-contact systems.1997A&AS..122..515Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/122/515CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/122/515https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/122/515http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/122/515https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/122/515https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/122/515http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/122/515GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+AS/122/515/table3aV magnitude differences of HL AurrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleDmagDifferential magnitudemagphot.mag;arith.difffloatJ/A+AS/122/515/table3bB magnitude differences of HL AurrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleDmagDifferential magnitudemagphot.mag;arith.difffloatJ/A+AS/122/515/table5Times of minima of HL AurWWeigth (1)stat.weightintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleEInteger eclipse cycle numbermeta.number;time.perioddoubleO-CObserved - Compiled residualstat.fit.residualfloatRefReference (2)meta.refchar