J/AJ/152/199ivo://CDS.VizieR/J/AJ/152/199doi:10.26093/cds/vizier.51520199CDSSamec R.G.Nyaude R.Caton D.Van Hamme W.2017-06-26T11:49:32Z2017-02-03T09:42:00ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometryHigh-precision BVR_c_I_c_ light curves of FF Vul were taken during the fall of 2015 with the Dark Sky Observatory 0.81m reflector of Appalachian State University, and the SARA north 0.91m reflector at KPNO. FF Vul is an eclipsing binary with a period of 0.44 day. A Wilson-Devinney solution shows that the binary is a near-contact, semidetached binary, i.e., with a V1010 Oph-type configuration. Five eclipse timings (three primary and two secondary) were calculated. A quadratic ephemeris was determined indicating that the period is decreasing. A near-equatorial hot spot was modeled on the cooler, secondary star, possibly caused by matter impacting from the primary component via the inner Lagrangian point. The component temperature difference is more than 1500K. The solution confirms a total secondary eclipse of 23 minutes duration. As expected in binaries of this type, there is a magnetic spot region.2016AJ....152..199Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/199CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/AN/334/860 : Catalogue of eclipsing variables. Version 2 (Avvakumova+, 2013)J/AJ/136/1067 : New beta Lyrae and Algol candidates in NSVS (Hoffman+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/199https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/152/199/table1Observations of FF VulrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFlt[BVRI] Filter (Johnson-Cousins B, V, R_c_, or I_c_)pos.cartesian.ycharHJD[7.5/40.8] Modified Heliocentric Julian Date (HJD-2457270)dtime.epochfloatDmag[-0.22/0.84] The {Delta} magnitude in Flt (1)magphot.mag;arith.difffloat