J/AJ/160/49ivo://CDS.VizieR/J/AJ/160/49doi:10.26093/cds/vizier.51600049CDSLee J.W.Koo J.-R.Hong K.Park J.-H.2021-09-22T06:38:25Z2020-11-04T08:15:21ZCDS support team

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

cds-question@unistra.frmultiple-starswhite-dwarf-starsvisible-astronomyspectroscopyphotometryradial-velocityWe report the first BV light curves and high-resolution spectra of the post-mass transfer binary star WASP0131+28 to study the absolute properties of extremely low-mass white dwarfs. From the observed spectra, the double-lined radial velocities were derived, and the effective temperature and rotational velocity of the brighter, more massive primary were found to be Teff_1_=10000{+/-]200K and v_1_sin_i_=55{+/-}10km/s, respectively. The combined analysis of the Transiting Exoplanet Survey Satellite (TESS) archive data and ours yielded the accurate fundamental parameters of the program target. The masses were derived to about 1.0% accuracy and the radii to 0.6%, or better. The secondary component's parameters of M_2_=0.200{+/-}0.002M_{sun}_, R_2_=0.528{+/-}0.003R_{sun}_, Teff_2_=11186{+/-}235K, and L_2_=3.9{+/-}0.3L_{sun}_ are in excellent agreement with the evolutionary sequence for a helium-core white dwarf of mass 0.203M_{sun}, and indicates that this star is halfway through the constant luminosity phase. The results presented in this article demonstrate that WASP0131+28 is an EL CVn eclipsing binary in a thin disk, which is formed from the stable Roche-lobe overflow channel and composed of a main-sequence dwarf with a spectral type A0 and a pre-He white dwarf.2020AJ....160...49Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/49CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/A+A/339/123 : PSR J1012+5307 evolutionary tracks (Driebe+ 1998)J/A+A/447/173 : 3D-kinematics white dwarfs from SPY project. II. (Pauli+, 2006)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/AJ/143/95 : Transit light curves of HAT-P-12 (Lee+, 2012)J/A+A/557/A19 : Mass and age of extreme low-mass white dwarfs (Althaus+, 2013)J/A+A/557/A79 : Spectra of KIC10661783 (Lehmann+, 2013)J/AJ/147/104 : Photometry and velocities of 1SWASP J093010A and B (Koo+, 2014)J/ApJ/835/189 : KIC 11401845 eclipse timings (Lee+, 2017)J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/49https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/160/49/table1CCD photometric data of WASP 0131+28 observed at Mt. Lemmon Optical Astronomy Observatory (LOAO)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD-B[2457710/2458114] Barycentric Julian Date of B band observationdtime.epochdoubleBmag[10.87/11.06] Standard B band magnitudemagphot.mag;em.opt.BfloatBJD-V[2457710/2458114]? Barycentric Julian Date of V band observationdtime.epochdoublenullableVmag[10.78/10.97]? Standard V band magnitudemagphot.mag;em.opt.VfloatnullableJ/AJ/160/49/table3Radial velocities of WASP 0131+28 with Bohyunsan Optical Echelle Spectrograph (BOES)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[408/1785] Barycentric Julian Date; BJD-2457000dtime.epochdoubleRVel1[-29.4/13.9] Radial velocity of component 1km/sphys.veloc;pos.heliocentricfloate_RVel1[0.22/0.77] Error on RVel1 ({sigma}_1_)km/sstat.errorfloatRVel2[-213/194] Radial velocity of component 2km/sphys.veloc;pos.heliocentricfloate_RVel2[0.78/2.7] Error on RVel2 ({sigma}_2_)km/sstat.errorfloat