J/ApJ/871/244ivo://CDS.VizieR/J/ApJ/871/244doi:10.26093/cds/vizier.18710244CDSAntokhin I.I.Cherepashchuk A.M.2020-10-08T08:46:45Z2020-08-10T11:14:46ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsastronomical-reference-materialsBy using available archival X-ray data, we significantly extended the list of times of X-ray minima. The new list includes 65 data points obtained by critically reanalyzing RXTE ASM data, 88 data points based on observations by MAXI, and 2 data points based on observations by SUZAKU and AstroSat. Analyzing the data along with times of X-ray minima available from the literature, we provide the most accurate estimate of the rate of period change to date. We do not confirm the existence of a second derivative of the orbital period suggested by some authors earlier. Instead, we find that the changes in the period can be fit by a sum of quadratic and sinusoidal functions. The period of sinusoidal variations is 15.79yr. They can be related either to apsidal motion in the close binary with eccentricity e~0.03 or to the presence of a third body with a mass of about 0.7M_{sun}_ located at a distance ~16 au from the close binary.2019ApJ...871..244Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/871/244CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)VI/117 : Observation Log from ASCA (PLAIN Center, 2001)V/106 : Catalogue of X-ray binaries (Liu+ 2001)J/ApJS/96/303 : Calibrating Broad Band X-ray Telescope (Weaver+ 1995)J/ApJS/151/299 : Spectra classification from ISO PHT-S database (Hodge+, 2004)J/ApJ/649/L9 : INTEGRAL IBIS census of the sky >100keV (Bazzano+, 2006)J/A+A/467/585 : Sources detected by ISGRI (Bodaghee+, 2007)J/A+A/480/611 : XMM-Newton Slew Survey catalogue, XMMSL1 (Saxton+, 2008)J/MNRAS/406/307 : Radio variations of Cygnus X-3 (Koljonen+, 2010)J/A+A/522/A68 : Variable sources detected by INTEGRAL (Telezhinsky+, 2010)J/BaltA/24/395 : X-ray and radio sources in binaries (Malkov+, 2015)J/ApJS/222/15 : WATCHDOG all-sky database of Gal. BHXBs (Tetarenko+, 2016)J/ApJS/223/15 : 8yr INTEGRAL/IBIS soft gamma-ray source obs. (Bird+, 2016)J/ApJS/235/4 : The 105-month Swift-BAT all-sky hard X-ray survey (Oh+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/871/244https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/871/244http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/871/244https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/871/244https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/871/244http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/871/244GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/871/244/table1Times of X-ray minima and orbit numbersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[40949.42/58179.4] Modified Julian Date (1)dtime.epochdoublee_MJD[0.0005/0.02] Error in MJDdstat.error;time.epochfloatNum[0/86284] Orbit numbermeta.idintRef[1/13] Reference number (2)meta.id;meta.mainint