J/ApJ/954/111ivo://CDS.VizieR/J/ApJ/954/111doi:10.26093/cds/vizier/ba-xt-3fCDSMeng F.Zhu L.Qian S.Liu N.Li L.Matekov A.2026-07-02T12:00:24Z2025-11-12T15:05:24ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryvisible-astronomyThe first detailed photometric and spectroscopic study of G-type short-period binary NY Boo is presented. The radial velocity curve was obtained by the cross-correlation function (CCF) method based on LAMOST and SDSS spectra, which derived its mass ratio as q=0.139(1/7.2). The CCF profiles of the SDSS spectra clearly show the existence of a cool third component, which is supported by the results of the orbital period investigation. The period study based on the O-C analysis indicates that besides a long-term decrease, the orbital period has a periodic oscillation due to the light-travel time effect caused by a third body. When the third light contribution is consistent with the CCF results, the orbit of the third body and the inner pair are non-coplanar with m_3_=0.31M_{sun}_. Combining with the TESS light curves, it is found that the target is a deep and low-mass-ratio contact binary (DLMRCB) with a fill-out factor of f=73%. The notable asymmetry in light curves was detected and explained by the spot model very well. The spectroscopic profiles, the cyclic variation in the O-C diagram, and the radial velocity curve and light-curve solutions all suggest that NY Boo is a hierarchical triple system with a cool tertiary component orbiting around an active DLMRCB. With the orbital period shrinking, the binary may eventually merge. The period of NY Boo decreases faster than other shrinking DLMRCB, together with active inner pair and non-coplanar tertiary component, making NY Boo an important target for studying the late evolution of binaries.2023ApJ...954..111Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/954/111CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)V/156 : LAMOST DR7 catalogs (Luo+, 2019)III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)J/AJ/129/2420 : Proper motion derivatives of binaries (Makarov+, 2005)J/AJ/130/767 : RVel studies of close binary stars (Rucinski+, 2005)J/AJ/131/2986 : Multiplicity of contact binaries (Pribulla+, 2006)J/A+A/450/681 : Companions to close spectroscopic bin. (Tokovinin+, 2006)J/AJ/133/1977 : Radial velocities of 10 close binaries (Pribulla+, 2007)J/AJ/134/2353 : Observations of contact binaries (Rucinski+, 2007)J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)J/AJ/137/3646 : Radial velocities of 10 close binaries (Pribulla+, 2009)J/AJ/137/3655 : Radial velocities of 8 close binaries (Pribulla+, 2009)J/MNRAS/405/1930 : Period changes of EA-, EB- and EW-types bin. (Liao+, 2010)J/AJ/142/99 : BVRI observations of TZ Boo (Christopoulou+, 2011)J/other/RAA/11.924 : Atmospheric parameters for 771 stars (Wu+, 2011)J/AJ/145/39 : Differential BV(RI)c light curves of PY Vir (Zhu+, 2013)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/448/429 : Starspots in short-period Kepler binaries (Balaji+, 2015)J/AJ/157/207 : BVRI_ light curve observations for VZ Lib (Liao+, 2019)J/other/RAA/20.163 : Contact binaries in LAMOST DR7 (Qian+, 2020)J/ApJ/922/122 : BVRcIc LCs of two contact binaries (Li+, 2021)J/AJ/162/13 : Parameters for 173 eclipsing binaries (Li+, 2021)J/AJ/161/46 : (O-C) curve of the binary system KIC 06852488 (Shi+, 2021)J/AJ/164/202 : Extremely Low Mass Ratio Contact Binaries I. (Li+, 2022)http://heasarc.gsfc.nasa.gov/docs/tess/ : TESS Science Support Centerhttp://www.lamost.org/dr9/v1.0/ : LAMOST DR9 home pagehttp://dr17.sdss.org/infrared/spectrum/search : SDSS DR17 SAS searchhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/954/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/954/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/954/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/954/111https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/954/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/954/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/954/111/table2The light minimum times of NY BoorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of eclipse minimumdtime.epochdoublee_BJD[7e-05/0.006]? Uncertainty in BJDdstat.error;time.epochdoublenullableE[-22435/2915] Epoch numbermeta.number;time.epochdoubleO-C[-0.36/0.0033] The O-C value (1)dstat.value;stat.fit.omcdoubleRef[1/14] Reference code (2)meta.bibint