J/AJ/144/37ivo://CDS.VizieR/J/AJ/144/37doi:10.26093/cds/vizier.51440037CDSZhu L.-Y.Zejda M.Mikulasek Z.Liska J.Qian S.-B.de Villiers S.N.2017-07-05T06:59:33Z2013-09-24T08:12:22ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe present a detailed study of the close eclipsing binary BS Vulpeculae. Although it is relatively bright (V: 10.9-11.6mag) and belongs to short-periodic variable stars (P=0.48days), it is rather neglected. To perform a thorough period analysis, we collected all available photometric observations that span the time interval of 1898-2010. Observations include archive photographic plate measurements and visually determined eclipse minima timings done in 1979-2003, which were later shown to be biased to accommodate the existing linear ephemeris. Applying our own direct period analysis we found a well-defined shortening of the orbital period of dP/dt=-6.70(17)x10^-11^=-2.11(6)ms/yr, which implies a continual mass flow from the primary to the secondary component. Using the 2003 version of the Wilson-Van Hamme code, our new complete BV(IR)_C_ light curves were analyzed and the physical parameters of the system were derived. We found that BS Vul is a near contact binary system with the primary component filling its critical Roche lobe. The luminosity enhancement on the left shoulder of the secondary minimum shown in the light curves can be explained as a result of a persistent hot spot on the secondary due to the mass transfer from the primary component to the secondary one and heating the facing hemisphere of the secondary component, which is consistent with our result of period analysis. With the period decrease, BS Vul will evolve toward the contact phase. It is another good observational example as predicted by the theory of thermal relaxation oscillations.2012AJ....144...37Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/37CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)J/AJ/143/34 : SZ Her BVRI light curves (Lee+, 2012)J/AJ/142/99 : BVRI observations of TZ Boo (Christopoulou+, 2011)J/AJ/142/12 : WZ Cyg BVRI light curves (Lee+, 2011)J/AJ/141/44 : V396 Mon BVRI light curves (Liu+, 2011)J/other/JAVSO/39.23 : Maxima of short period pulsating stars (Samolyk+, 2011)J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)J/MNRAS/407/497 : BVRI light curves of KZ Pav (Surgit+, 2010)J/AJ/140/1150 : GSC 3355-0394 BVRI differential photometry (Samec+, 2010)J/AJ/139/2669 : CL Aur BVRI light curves (Lee+, 2010)J/AJ/139/1801 : XY UMa BVRI light curves (Yuan, 2010)J/AJ/136/1667 : VV Vir BVRI differential photometry (Samec+, 2008)J/MNRAS/379/1665 : XX Cep BVRI light curves (Lee+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/37https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/144/37/table1CCD photometric observations in BVIR bandpasses for BS Vul observed in 2009 and 2010recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFilterFilter used in the observation (B, V, I or R)instr.setup;obscharHJDHeliocentric Julian Datedtime.epochdoubleDmagDifferential magnitude in Filtermagphot.mag;arith.difffloat