J/PASP/108/338ivo://CDS.VizieR/J/PASP/108/338doi:10.26093/cds/vizier.61080338CDSGonzalez J.F.Lapasset E.Gomez M.Ahumada J.2025-09-09T14:12:08Z1997-12-09T21:47:30ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvisible-astronomybroad-band-photometryWe present UBV photoelectric observations of the W UMa star BF Pav obtained between 1987 and 1993. A time-of-minimum study allows detection of a likely period increase of about 0.015s/yr. The Wilson-Devinney code is employed to simultaneously model the B and V light curves for several fixed values of the mass ratio q. From the quality-of-fit of the different solutions an approximate value of q=1.4+/-0.2 is derived. Absolute values of masses, dimensions, and luminosities are estimated by means of standard mass-luminosity relations for main-sequence stars. The detected period variation determines a lower limit of 5x10^-7M_{sun}_/yr for the rate of mass transfer from the less-massive to the more-massive component. We speculate that BF Pav has recently become in contact and is now in a rapid phase of mass transfer.1996PASP..108..338Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/108/338CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/108/338https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/108/338http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/108/338https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/108/338https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/108/338http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/108/338GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/PASP/108/338/table1vDifferential V observations of BF PavonisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2440000HJD of observation (-2440000)dtime.epochdoubledMagDifferential (Var-Comp) magnitudemagphot.mag;arith.difffloatJ/PASP/108/338/table1bDifferential B observations of BF PavonisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2440000HJD of observation (-2440000)dtime.epochdoubledMagDifferential (Var-Comp) magnitudemagphot.mag;arith.difffloatJ/PASP/108/338/table1uDifferential U observations of BF PavonisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD-2440000HJD of observation (-2440000)dtime.epochdoubledMagDifferential (Var-Comp) magnitudemagphot.mag;arith.difffloat