J/ApJ/872/43ivo://CDS.VizieR/J/ApJ/872/43doi:10.26093/cds/vizier.18720043CDSHinkle K.H.Fekel F.C.Joyce R.R.Mikolajewska J.Galan C.Lebzelter T.2020-11-26T11:30:08Z2020-08-26T07:31:32ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsneutron-starsm-starsinfrared-astronomyspectroscopyradial-velocityThe X-ray symbiotic (SyXB) V934 Her = 4U1700+24 is an M giant-neutron star (NS) binary system. Employing optical and infrared radial velocities spanning 29yr combined with the extensive velocities in the literature, we compute the spectroscopic orbit of the M giant in that system. We determine an orbital period of 4391d, or 12.0yr, the longest for any SyXB and far longer than the 404 day orbit commonly cited for this system in the literature. In addition to the 12.0yr orbital period, we find a shorter period of 420 days, similar to the one previously found. Instead of orbital motion, we attribute this much shorter period to long secondary pulsation of the M3 III SRb variable. Our new orbit supports earlier work that concluded that the orbit is seen nearly pole-on, which is why X-ray pulsations associated with the NS have not been detected. We estimate an orbital inclination of 11.3{deg}+/-0.4{deg}. Arguments are made that this low inclination supports a pulsation origin for the 420 day secondary period. We also measure the CNO and Fe peak abundances of the M giant and find it to be slightly metal-poor compared to the Sun, with no trace of the NS-forming supernova event. The basic properties of the M giant and NS are derived. We discuss the possible evolutionary paths that this system has taken to get to its current state.2019ApJ...872...43Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/872/43CatalogResearchIsServedByTAP VizieR generic servicerelated-toIX/2 : Second Ariel X-Ray Catalogue (2A) (Cooke+ 1978)IX/4 : Fourth UHURU Catalogue (4U) (Forman+ 1978)II/346 : JMMC Stellar Diameters Catalogue - JSDC. Version 2 (Bourges+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJS/95/535 : IR CO line list for X 1{Sigma}+ state (Goorvitch, 1994)J/A+AS/115/339 : Stellar models VI. (Charbonnel+, 1996)J/ApJS/111/445 : Spectra of normal stars in the K band (Wallace+ 1997)J/ApJS/124/527 : Oscillator strengths for lines in JH bands (Melendez+, 1999)J/A+A/469/807 : Catalogue of Galactic low-mass X-ray binaries (Liu+, 2007)J/ApJ/660/1486 : Variability of LMC semiregular variables (Soszynski+, 2007)J/A+A/498/627 : Radial velocities of SB with M giant (Famaey+, 2009)J/MNRAS/399/2063 : LMC red giants in D sequence (Nicholls+, 2009)J/AJ/145/111 : Radial velocities of five spectroscopic bin. (Fekel+, 2013)J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)J/ApJS/221/24 : SDSS-III APOGEE H-band spectral line lists (Shetrone+, 2015)J/MNRAS/448/464 : JHK lightcurves of red giants in the SMC (Takayama+, 2015)J/ApJ/825/38 : Carbon & oxygen ratios for nearby Miras (Hinkle+, 2016)J/A+A/608/A100 : CMD and mass distribution of Ba stars (Escorza+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/872/43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/872/43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/872/43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/872/43https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/872/43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/872/43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/872/43/table1Radial velocities of V934 HerBand[b-g ] Passband (4)instr.bandpasscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[45072.39/58028.7] Heliocentric Julian date; HJD-2400000dtime.epochdoubleRV[-51.3/-44] Observed total radial velocitykm/sphys.veloc;pos.heliocentricfloatO-C[-3.1/2.1] Observed minus calculated velocity residualkm/sstat.fit.residual;phys.veloc;stat.fit.omcfloatphiL[0.005/1] Long period orbital phasetime.phasefloatRVlong[-51.8/-44.4] Long period radial velocity (1)km/sphys.veloc;pos.heliocentricfloatphiS[0.003/1] Short period orbital phasetime.phasefloatRVshort[-2.6/2] Short period radial velocity (2)km/sphys.veloc;pos.heliocentricfloatInstSource (3)meta.id;instrchar