J/AJ/156/27ivo://CDS.VizieR/J/AJ/156/27doi:10.26093/cds/vizier.51560027CDSChaturvedi P.Sharma R.Chakraborty A.Anandarao B.G.Prasad N.J.S.S.V.2019-03-06T07:50:42Z2019-01-22T09:48:36ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsf-starsdwarf-starsradial-velocitystellar-massesstellar-radiiEclipsing binaries (EBs) with one of the companions as very low-mass stars (VLMSs; or M dwarfs) are testbeds to substantiate stellar models and evolutionary theories. Here we present four EB candidates with F-type primaries, namely, SAO 106989, HD 24465, EPIC 211682657, and HD 205403, identified from different photometry missions, SuperWASP, Kilodegree Extremely Little Telescope (KELT), Kepler 2 (K2), and Solar Terrestrial Relations Observatory (STEREO). Using the high-resolution spectrograph PRL Advanced Radial velocity Abu-sky Search at the 1.2 m telescope at Mount Abu, Rajasthan, India, we hereby report the detection of four VLMSs as companions to the four EBs. We performed spectroscopic analysis and found the companion masses to be 0.256+/-0.005, 0.233+/-0.002, 0.599+/-0.017, and 0.406+/-0.005 M_{sun}_ for SAO 106989, HD 24465, EPIC 211682657, and SAO 106989B, respectively. We determined orbital periods of 4.39790+/-0.00001, 7.19635+/-0.00002, 3.142023+/-0.000003, and 2.444949+/-0.000001 days and eccentricities of 0.248+/-0.005, 0.208+/-0.002, 0.0097+/- 0.0008, and 0.002+/-0.002 for EBs SAO 106989, HD 24465, EPIC 211682657, and HD 205403, respectively. The radii derived by modeling the photometry data are 0.326+/-0.012 R_{sun}_ for SAO 106989, 0.244+/-0.001 R_{sun}_ for HD 24465B, 0.566+/-0.005 R_{sun}_ for EPIC 211682657B, and 0.444+/-0.014 R_{sun}_ for HD 205403B. The radii of HD 24465B and EPIC 211682657B have been measured by precise Kepler photometry and are consistent with theory within the error bars. However, the radii of SAO 106989B and HD 205403B, measured by KELT and STEREO photometry, are 17%-20% higher than those predicted by theory. A brief comparison of the results of the current work is made with the M dwarfs already studied in the literature.2018AJ....156...27Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/156/27CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/364/665 : Very low mass stars radial velocities (Segransan+, 2000)J/A+A/398/239 : RI differential photometry of CU Cnc (Ribas, 2003)J/ApJ/663/573 : Sloan gi light curves of HAT-TR-205-012 (Beatty+, 2007)J/ApJ/684/635 : New low-mass eclipsing binary from SDSS-II (Blake+, 2008)J/ApJ/691/1400 : Absolute properties of CM Dra (Morales+, 2009)J/ApJ/701/764 : Light curves for five M-dwarf stars (Fernandez+, 2009)J/MNRAS/406/2559 : BVRI light curves of GSC2314-0530 (Dimitrov+, 2010)J/AJ/141/166 : HATNet variability survey of K and M dwarfs (Hartman+, 2011)J/ApJ/728/48 : Multicolor eclipse data for 6 new binaries (Kraus+, 2011)J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)J/MNRAS/426/1507 : Detached M dwarf eclipsing binaries in WTS (Birkby+, 2012)J/A+A/549/A18 : WASP-30 and J1219-39 light + velocity curves (Triaud+, 2013)J/MNRAS/431/3240 : Ji photometry of WTS 19g-4-02069 (Nefs+, 2013)J/A+A/572/A50 : J0113+31 light + velocity curves (Gomez Maqueo Chew+, 2014)J/ApJ/797/31 : The G+M eclipsing binary V530 Orionis photometryJ/MNRAS/437/2831 : 4 transiting F-M binary systems (Zhou+, 2014)J/MNRAS/451/2263 : Differential photometry of the EB* HATS551-027 (Zhou+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/156/27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/156/27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/156/27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/156/27https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/156/27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/156/27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/156/27/stars (List of stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/156/27/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/156/27/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/156/27/stars?GETtext/xml+votable180.050000true319.188458319.36022220.0055555555555555566/284 4338 12708 18989https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/156/27?format=asciidefaultJ/AJ/156/27/starsList of starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharRAJ2000Simbad Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000)pos.eq.dec;meta.mainPer[2.444949/7.19635] Period from this workdtime.perioddoublee_Per[1e-06/2e-05] Uncertainty in Perdstat.errordoubleVPVelocity curvemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/156/27/table1RV observations for all stars: SAO 106989, HD 24465, EPIC 211682657 and HD 205403e_RV[0.011/0.743] Uncertainty in RVkm/sstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharDateUT date of observation (mid-exposure)time.epoch;obsnullableBJD[56588.193/58085.4] Barycentric Julian Date (BJD-2400000; TDB)dtime.epochdoubleExp[1200/3000] Exposure timestime.duration;obs.exposureintRV[-32.479/78.608] Radial velocitykm/sphys.veloc;pos.heliocentricdoubleJ/AJ/156/27/table4A compilation of known M dwarfs (M=<0.6 M_{sun}_) from the literature which have masses and radii measured at accuracies better than or at best equal to 10%SimbadNameSimbad column added by the CDSmeta.idcharEBName of eclipsing binarymeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_EBComponent designationmeta.code.multipcharn_EBNote on EB (1)meta.notecharMass[0.091/0.6009] Stellar masssolMassphys.massdoublee_Mass[0.0003/0.05] Uncertainty in MasssolMassstat.error;phys.massdoubleRad[0.1174/0.641] Stellar radiussolRadphys.size.radiusdoublee_Rad[0.00059/0.06] Uncertainty in RadsolRadstat.errordoubleRef[1/41] Reference (2)meta.ref;pos.frameint