J/ApJ/797/43ivo://CDS.VizieR/J/ApJ/797/43doi:10.26093/cds/vizier.17970043CDSMucciarelli A.Lovisi L.Ferraro F.R.Dalessandro E.Lanzoni B.,Monaco L.2017-09-12T11:40:41Z2016-11-23T14:15:15ZCDS support team

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

cds-question@unistra.frglobular-star-clustersradial-velocityBy using high-resolution spectra acquired with FLAMES-GIRAFFE at the ESO/VLT, we measured the radial and rotational velocities for 110 blue straggler stars (BSSs) in {omega} Centauri, the globular cluster-like stellar system harboring the largest known BSS population. According to their radial velocities, 109 BSSs are members of the system. The rotational velocity distribution is very broad, with the bulk of BSSs spinning at less than ~40 km/s (in agreement with the majority of such stars observed in other globular clusters) and a long tail reaching ~200km/s. About 40% of the sample has v_e_sini>40km/s and about 20% has v_e_sini>70km/s. Such a large fraction is very similar to the percentage of fast rotating BSSs observed in M4. Thus, {omega} Centauri is the second stellar cluster, beyond M4, with a surprisingly high population of fast spinning BSSs. We found a hint of radial behavior for a fraction of fast rotating BSSs, with a mild peak within one core radius, and a possible rise in the external regions (beyond four core radii). This may suggest that recent formation episodes of mass transfer BSSs occurred preferentially in the outskirts of {omega} Centauri, or that braking mechanisms able to slow down these stars are least efficient in the lowest density environments.2014ApJ...797...43Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/797/43CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/324/915 : Blue stragglers in M3 (Ferraro+ 1997)J/AJ/114/1087 : Omega Cen radial velocities (Mayor+ 1997)J/A+A/424/1101 : Variable Stars in the field of {omega} Cen (Kaluzny+, 2004)J/ApJ/632/894 : BSS, HB and turnoff stars in 4 GC (De Marco+, 2005)J/ApJ/663/267 : Blue straggler population of M5 (Lanzoni+, 2007)J/ApJ/661/L155 : Radial velocities RGB stars in omega Cen (Pancino+, 2007)J/ApJ/677/1069 : Blue stragglers in NGC 6388 (Dalessandro+, 2008)J/ApJ/681/311 : Blue stragglers in NGC 2419 (Dalessandro+, 2008)J/ApJ/704/750 : Rotational behavior of metal-poor stars (Cortes+, 2009)J/MNRAS/396/2183 : Radial vel. of red giants in {omega} Cen (Sollima+ 2009)J/ApJ/710/1032 : Proper motions in {omega} Cen (Anderson+, 2010)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/A+A/519/L3 : Lithium content of {omega} Cen (Monaco+, 2010)J/ApJ/726/L20 : Spectroscopy of Terzan 5 (Origlia+, 2011)J/ApJ/754/91 : Abundances and velocities of NGC 6397 stars (Lovisi+, 2012)J/ApJ/772/148 : Blue straggler and red giant stars in M30 (Lovisi+, 2013)J/A+A/560/A29 : O-stars in the VFTS Survey (Ramirez-Agudelo+ 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/797/43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/797/43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/797/43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/797/43https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/797/43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/797/43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/797/43/table1 (Parameters and velocities of the observed BSS sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/797/43/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/797/43/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/797/43/table1?GETtext/xml+votable180.050000true201.6079938-47.4235140.0055555555555555566/43225 43227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/797/43?format=asciiOpticaldefaultJ/ApJ/797/43/table1Parameters and velocities of the observed BSS samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[6365/711338] Identification numbermeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainTeff[7115/10703] Effective temperatureKphys.temperature.effectiveintlogg[3.77/4.59] Log of the surface gravitylog(cm.s**-2)phys.gravityfloatRV[191.3/266.1] Radial velocitykm/sphys.veloc;pos.heliocentricfloatvsini[0/200] Projected rotational velocitykm/sphys.veloc.rotatintDataDataset identifier (1)meta.id;meta.datasetcharONameOther name (2)meta.idcharVarTypeVariable type (3)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar