J/AJ/151/152ivo://CDS.VizieR/J/AJ/151/152doi:10.26093/cds/vizier.51510152CDSMilliman K.E.Leiner E.Mathieu R.D.Tofflemire B.M.Platais I.2017-07-04T07:09:16Z2016-07-20T12:43:34ZCDS support team

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

cds-question@unistra.fropen-star-clustersgiant-starsspectroscopic-binary-starsradial-velocityIn an optical color-magnitude diagram, sub-subgiants (SSGs) lie redward of the main sequence and fainter than the base of the red giant branch in a region not easily populated by standard stellar-evolution pathways. In this paper, we present multi-epoch radial velocities for five SSG candidates in the old and metal-rich open cluster NGC 6791 (8Gyr, [Fe/H]=+0.30). From these data, we are able to make three-dimensional kinematic membership determinations and confirm four SSG candidates as likely cluster members. We also identify three member SSGs as short-period binary systems and present their orbital solutions. These are the first SSGs with known three-dimensional kinematic membership, binary status, and orbital parameters since the two SSGs in M67 studied by Mathieu et al. We also remark on the other properties of these stars including photometric variability, H{alpha} emission, and X-ray luminosity. The membership confirmation of these SSGs in NGC 6791 strengthens the case that SSGs are a new class of nonstandard stellar evolution products, and that a physical mechanism must be found that explains the evolutionary paths of these stars.2016AJ....151..152Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/152CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/148/61 : WOCS. LIX. RVs of NGC 6791 (Tofflemire+, 2014)J/AJ/147/4 : HST photometry of 5 globular clusters (Ross+, 2014)J/ApJ/770/98 : Chandra study of NGC 6791 (van den Berg+, 2013)J/A+A/543/A106 : UBVRI photometry in NGC6791 (Brogaard+, 2012)J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)J/A+A/525/A2 : Eclipsing binaries in NGC 6791 (Brogaard+, 2011)J/A+A/492/171 : VIc light curves of NGC 6791 V20 (Grundahl+, 2008)J/A+A/471/515 : V light curves of NGC 6791 variable stars (De Marchi+, 2007)J/AJ/133/1585 : Stromgren photometry in NGC 6791 (Anthony-Twarog+, 2007)J/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)J/AJ/129/656 : Infrared photometry of NGC 6791 (Carney+, 2005)J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)J/AJ/123/3460 : Low-amplitude variables in NGC 6791 (Mochejska+, 2002)J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)J/AJ/108/585 : UBVI photometry of NGC 6791 (Montgomery+, 1994)J/MNRAS/243/492 : BV Photometry of NGC 6791 (Kaluzny, 1990)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/152https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/152http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/152https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/152https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/152http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/152GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/152/stars (Positions and proper motions , and photometry of the Sub-SubGiant (SSG) candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/152/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/152/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/152/stars?GETtext/xml+votable180.050000true290.301583337.63030560.0055555555555555566/14573 145753.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/151/152?format=asciiOpticaldefaultJ/AJ/151/152/table3Radial-velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWOCS[117020/170008] WIYN Open Cluster Study numbermeta.id;meta.mainintHJDHeliocentric Julian Date of observation (HJD-2400000)dtime.epochdoubleW[1/3] Spectral setup (wavelength range: 1=5710-5950{AA}, 2=6450-6830{AA}, 3=5000-5250{AA})instr.bandwidthintRV[-78/-12.5] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.8/5.8] RV measurement error (1)km/sstat.errorfloatCorr[0.23/0.79] Correlation heightstat.correlationfloatO-C[-3.27/4.48]? The O-C residualkm/sstat.fit.residual;stat.fit.omcfloatnullablePhase[0.01/1]? Phasetime.phasefloatnullableJ/AJ/151/152/starsPositions and proper motions , and photometry of the Sub-SubGiant (SSG) candidatesSimbadNameSimbad column added by the CDSmeta.idcharg'[18.63/18.95] The g' band magnitude (1)magphot.mag;em.opt.BfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWOCS[117020/170008] WIYN Open Cluster Study numbermeta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainpmX[0.41/0.87] Proper motion along X axis ({mu}_x_) (1)mas/yrpos.pmfloate_pmX[0.1/0.27] The 1{sigma} uncertainty in pmX (1)mas/yrstat.errorfloatpmY[1.03/1.92] Proper motion along Y axis ({mu}_y_) (1)mas/yrpos.pmfloate_pmY[0.09/0.15] The 1{sigma} uncertainty in pmY (1)mas/yrstat.errorfloatPpm[80/99] Proper motion membership probability (P_{mu}_) (1)%statintg'-r'[1.01/1.22] The g'-r' color index (1)magphot.color;em.opt.B;em.opt.RfloatVmag[17.65/18.3] The V band magnitude (2)magphot.mag;em.opt.VfloatB-V[1.15/1.35]? The B-V color index (2)magphot.color;em.opt.B;em.opt.VfloatnullableV-I[1.29/1.53] The V-I color index (2)magphot.color;em.opt.V;em.opt.IfloatS03Number of sources in Stetson et al. 2003 (cat. J/PASP/115/413) within 1.5''meta.ref.urlintnullablePer[5.8/11.5]? Period for sub-subgiant binary (3)dtime.periodfloatnullablee_Per[0.0008/0.007]? Error in Per (3)dstat.errorfloatnullableONameOther name(s) (4)meta.idcharvdB13Number of sources in ven den Berg et al. 2013 (cat. J/ApJ/770/98) within 1.5''meta.ref.urlintnullabledM07Number of sources in de Marchi et al. 2007 (cat. J/A+A/471/515) within 1.5''meta.ref.urlintnullableVPVelocity Plot for the binary sub-subgiantmeta.ref.urlchar