J/AJ/148/83ivo://CDS.VizieR/J/AJ/148/83doi:10.26093/cds/vizier.51480083CDSSales Silva J.V.Pena Suarez V.J.Katime Santrich O.J.Pereira C.B.,Drake N.A.Roig F.2017-11-06T12:23:43Z2014-12-05T10:49:48ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsline-intensitiesradial-velocityBinary stars in open clusters are very useful targets in constraining the nucleosynthesis process. The luminosities of the stars are known because the distances of the clusters are also known, so chemical peculiarities can be linked directly to the evolutionary status of a star. In addition, binary stars offer the opportunity to verify a relationship between them and the straggler population in both globular and open clusters. We carried out a detailed spectroscopic analysis to derive the atmospheric parameters for 16 red giants in binary systems and the chemical composition of 11 of them in the open clusters NGC 2360, NGC 3680, and NGC 5822. We obtained abundances of C, N, O, Na, Mg, Al, Ca, Si, Ti, Ni, Cr, Y, Zr, La, Ce, and Nd. The atmospheric parameters of the studied stars and their chemical abundances were determined using high-resolution optical spectroscopy. We employ the local thermodynamic equilibrium model atmospheres of Kurucz and the spectral analysis code MOOG. The abundances of the light elements were derived using the spectral synthesis technique. We found that the stars NGC 2360-92 and 96, NGC 3680-34, and NGC 5822-4 and 312 are yellow straggler stars. We show that the spectra of NGC 5822-4 and 312 present evidence of contamination by an A-type star as a secondary star. For the other yellow stragglers, evidence of contamination is given by the broad wings of the H{alpha}. Detection of yellow straggler stars is important because the observed number can be compared with the number predicted by simulations of binary stellar evolution in open clusters. We also found that the other binary stars are not s-process enriched, which may suggest that in these binaries the secondary star is probably a faint main-sequence object. The lack of any s-process enrichment is very useful in setting constraints for the number of white dwarfs in the open cluster, a subject that is related to the birthrate of these kinds of stars in open clusters and also to the age of a cluster. Finally, rotational velocities were also determined and their values were compared with those already determined for field giant stars.2014AJ....148...83Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/148/83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/212 : Proper motions in NGC 3680 (Kozhurina-Platais+, 1995)J/AJ/146/39 : Spectroscopy of NGC 5822-2 and NGC 5822-201 (Katime+, 2013)J/MNRAS/422/3527 : Equivalent widths of 11 NGC 3680 stars (Mitschang+, 2012)J/MNRAS/419/1350 : Red giants abundances in 4 open clusters (Reddy+, 2012)J/A+A/535/A30 : Chemical abundance of stars in open clustersJ/A+A/515/A28 : Abundances of dwarfs and giants in 2 open clustersJ/AJ/139/1942 : Equivalent widths of red giants in open clustersJ/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)J/A+A/502/267 : EWs of 31 giant stars of 10 open clusters (Smiljanic+, 2009)J/A+A/485/303 : Radial velocities for 1309 stars & 166 OClJ/A+A/473/829 : Orbital elements of 156 spectroscopic binariesJ/A+A/360/509 : Chemical abundances in 7 red giants (Hamdani+, 2000)J/A+A/319/481 : Radial velocities of 10 spectroscopic binariesJ/A+AS/118/407 : CCD photometry & velocities of NGC 3680 starsJ/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)J/PASP/105/78 : Photometry in open cluster NGC 5822 (Twarog+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/148/83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/148/83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/148/83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/148/83https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/148/83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/148/83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/148/83/table1 (Log of the observations and relevant information for the target stars of open clusters NGC 2360, NGC 3680, and NGC 5822)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/83/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/83/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/83/table1?GETtext/xml+votable180.050000true109.4299333-15.61853610.0055555555555555566/21538 38242 41834https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/148/83?format=asciiOpticaldefaultJ/AJ/148/83/table1Log of the observations and relevant information for the target stars of open clusters NGC 2360, NGC 3680, and NGC 5822SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCNGC identification of the open clustermeta.id.parentintStarStar number within the open clustermeta.id;meta.mainintCD/CPDCD or CPD number (when available) of the starmeta.idVmagThe V-band magnitudemagphot.mag;em.opt.VfloatB-VThe B-V color indexmagphot.color;em.opt.B;em.opt.VfloatRV1Radial velocity from Mermilliod et al. 2008 (J/A+A/485/303)km/sspect.dopplerVelocfloate_RV1Error in RV1km/sstat.errorfloatRV2Our value of the radial velocitykm/sspect.dopplerVelocfloate_RV2Error in RV2km/sstat.errorfloatDateDate of observationtime.epochnullableMJDJulian Date of observation (JD-2400000)dtime.epochdoubleExpExposure timestime.duration;obs.exposureintM+08Display the data from Mermilliod et al. 2008 (cat. J/A+A/485/303)meta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/148/83/ewAll equivalent widths (file added at CDS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonLine identifier (G2)phys.atmol.ionStagecharlambdaWavelength {lambda}0.1nmem.wlfloatLEPLower Excitation Potential {chi}eVphys.atmol.excitation;stat.minfloatloggfOscillator strengthphys.atmol.oscStrengthfloatr_loggfReference for loggf (G3)meta.ref;pos.framecharEW1? Equivalent width for NGC 2360-510.1pmspect.line.eqWidthintnullableEW2? Equivalent width for NGC 2360-520.1pmspect.line.eqWidthintnullableEW3? Equivalent width for NGC 2360-620.1pmspect.line.eqWidthintnullableEW4? Equivalent width for NGC 2360-920.1pmspect.line.eqWidthintnullableEW5? Equivalent width for NGC 2360-960.1pmspect.line.eqWidthintnullableEW6? Equivalent width for NGC 3680-110.1pmspect.line.eqWidthintnullableEW7? Equivalent width for NGC 3680-200.1pmspect.line.eqWidthintnullableEW8? Equivalent width for NGC 3680-270.1pmspect.line.eqWidthintnullableEW9? Equivalent width for NGC 3680-340.1pmspect.line.eqWidthintnullableEW10? Equivalent width for NGC 5822-30.1pmspect.line.eqWidthintnullableEW11? Equivalent width for NGC 5822-40.1pmspect.line.eqWidthintnullableEW12? Equivalent width for NGC 5822-110.1pmspect.line.eqWidthintnullableEW13? Equivalent width for NGC 5822-510.1pmspect.line.eqWidthintnullableEW14? Equivalent width for NGC 5822-800.1pmspect.line.eqWidthintnullableEW15? Equivalent width for NGC 5822-1510.1pmspect.line.eqWidthintnullableEW16? Equivalent width for NGC 5822-3120.1pmspect.line.eqWidthintnullable