J/ApJ/711/138ivo://CDS.VizieR/J/ApJ/711/138doi:10.26093/cds/vizier.17110138CDSIrrgang A.Przybilla N.Heber U.Nieva M. F.Schuh S.2012-05-16T11:42:26Z2012-04-23T09:27:08ZCDS support team

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

cds-question@unistra.frchemical-abundancesb-starsspectroscopyYoung, massive stars in the Galactic halo are widely supposed to be the result of an ejection event from the Galactic disk forcing some stars to leave their place of birth as so-called runaway stars. Here, we present a detailed spectroscopic and kinematic analysis of the runaway B star HIP 60350 to determine which runaway scenario -a supernova explosion disrupting a binary system or dynamical interaction in star clusters- may be responsible for HIP 60350's peculiar orbit. Based on a non-local thermodynamic equilibrium approach, a high-resolution optical echelle spectrum was examined to revise spectroscopic quantities and for the first time to perform a differential chemical abundance analysis with respect to the B-type star 18 Peg. The results together with proper motions from the Hipparcos Catalog further allowed the three-dimensional kinematics of the star to be studied numerically. The abundances derived for HIP 60350 are consistent with a slightly supersolar metallicity agreeing with the kinematically predicted place of birth ~6kpc away from the Galactic center. However, they do not exclude the possibility of an {alpha}-enhanced abundance pattern expected in the case of the supernova scenario. Its outstanding high Galactic rest-frame velocity of 530+/-35km/s is a consequence of ejection in the direction of Galactic rotation and slightly exceeds the local Galactic escape velocity in a standard Galactic potential. Hence, HIP 60350 may be unbound to the Galaxy.2010ApJ...711..138Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/711/138CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/136 : Teff and metallicities for Tycho-2 stars (Ammons+, 2006)J/A+A/539/A143 : Nearby B-stars stellar parameters and abundances (Nieva+,J/MNRAS/410/190 : Young runaway stars within 3kpc (Tetzlaff+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/711/138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/711/138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/711/138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/711/138https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/711/138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/711/138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/711/138/table2Spectral line analysis of HIP 60350 and 18 PegrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon speciesphys.atmol.ionStagechar<HIP>? Averaged HIP 60350 abundance; log(X/H)+12phys.abundfloatnullablee_<HIP>? Uncertainty in <HIP>phys.abundfloatnullable<Peg>? Averaged 18 Peg abundance; log(X/H)+12phys.abundfloatnullablee_<Peg>? Uncertainty in <Peg>phys.abundfloatnullablelambdaWavelength; Angstroms0.1nmem.wlfloatExPotExcitation potentialeVphys.atmol.excitationfloatlog(gf)Log of oscillator strengthphys.atmol.oscStrengthfloatAccAccuracy indicator (1)meta.code.qualcharRefReference(s) (2)meta.ref;pos.framecharHIP? HIP 60350 abundance from the line; log(X/H)+12phys.abundfloatnullablePegThe 18 Peg abundance from the line; log(X/H)+12phys.abundfloat