J/ApJ/839/39ivo://CDS.VizieR/J/ApJ/839/39doi:10.26093/cds/vizier.18390039CDSLee J.W.Youn J.-H.Hong K.Han W.2018-03-12T08:39:27Z2017-12-11T11:19:59ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsinfrared-photometryvisible-astronomyphotometryNew CCD photometry of seven successive years from 2010 is presented for the HW Vir-type eclipsing binary 2M 1533+3759. Using the VI light curves together with the radial-velocity data given by For+ (2010ApJ...708..253F), we determined the absolute parameters of each component to be M1=0.442+/-0.012M{sun}, M2=0.124+/-0.005M{sun}, R1=0.172+/-0.002R{sun}, R2=0.157+/-0.002R{sun}, L1=19.4+/-1.4L{sun}, and L2=0.002+/-0.002L{sun}. These indicate that 2M 1533+3759 is a detached system consisting of a normal sdB primary and an M7 dwarf companion. Detailed analyses of 377 minimum epochs, including our 111 timings, showed that the orbital period of the system remains constant during the past 12 years. Inspecting both types of minima, we found a delay of 3.9+/-1.0s in the arrival times of the secondary eclipses relative to the primary eclipse times. This delay is in satisfactory agreement with the predicted Romer delay of 2.7+/-1.4s, and the result is the second measurement in sdB+M eclipsing binaries. The time shift of the secondary eclipse can be explained by some combination of the Romer delay and a non-zero eccentricity. Then the binary star would have a very small eccentricity of e.cos{omega}~0.0001.2017ApJ...839...39Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/839/39CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)J/AJ/138/478 : AR Boo differential BVR photometry (Lee+, 2009)J/ApJ/753/101 : Kepler eclipse timings of KIC 9472174 (Barlow+, 2012)J/AJ/143/95 : Transit light curves of HAT-P-12 (Lee+, 2012)J/A+A/566/A128 : Period variations in SuperWASP PCEB (Lohr+, 2014)J/A+A/576/A44 : Hot subdwarf binaries from MUCHFUSS (Kupfer+, 2015)J/ApJ/835/189 : KIC 11401845 eclipse timings (Lee+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/839/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/839/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/839/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/839/39https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/839/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/839/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/ApJ/839/39/table2CCD photometric observations of 2M 1533+3759recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltFilter used (I or V)instr.setup;instr.filtercharBJDBarycentric Julian Datedtime.epochdoubleDelmag[-0.04/1.7] Differential magnitude from the artificial reference star in Filtmagmeta.ref;phot.mag;arith.difffloatJ/ApJ/839/39/table5*New times of minimum light for 2M 1533+3759recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date; BJD-2450000dtime.epochdoublee_BJDBJD errordstat.errordoubleFiltFilter used (I or V)instr.setup;instr.filtercharMin("I" = Primary or "II" = Secondary)meta.codechar