Chemical abundances and kinematics of 257 G-, K-type field giants. Setting a base for further analysis of giant-planet properties orbiting evolved stars

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dc.contributor.authorAdibekyan, V. Zh.
dc.contributor.authorBenamati, L.
dc.contributor.authorSantos, N. C.
dc.contributor.authorAlves, S.
dc.contributor.authorLovis, C.
dc.contributor.authorUdry, S.
dc.contributor.authorIsraelian, G.
dc.contributor.authorSousa, S. G.
dc.contributor.authorTsantaki, M.
dc.contributor.authorMortier, A.
dc.contributor.authorSozzetti, A.
dc.contributor.authorDe Medeiros, J. R.
dc.date.accessioned2024-01-10T12:04:36Z
dc.date.available2024-01-10T12:04:36Z
dc.date.issued2015
dc.description.abstractWe performed a uniform and detailed abundance analysis of 12 refractory elements (Na, Mg, Al, Si, Ca, Ti, Cr, Ni, Co, Sc, Mn, and V) for a sample of 257 G-and K-type evolved stars from the CORALIE planet search programme. To date, only one of these stars is known to harbour a planetary companion. We aimed to characterize this large sample of evolved stars in terms of chemical abundances and kinematics, thus setting a solid base for further analysis of planetary properties around giant stars. This sample, being homogeneously analysed, can be used as a comparison sample for other planet-related studies, as well as for different type of studies related to stellar and Galaxy astrophysics. The abundances of the chemical elements were determined using an local thermodynamic equilibrium (LTE) abundance analysis relative to the Sun, with the spectral synthesis code MOOG and a grid of Kurucz ATLAS9 atmospheres. To separate the Galactic stellar populations, both a purely kinematical approach and a chemical method were applied. We confirm the overabundance of Na in giant stars compared to the field FGKdwarfs. This enhancement might have a stellar evolutionary character, but departures from LTE may also produce a similar enhancement. Our chemical separation of stellar populations also suggests a 'gap' in metallicity between the thick-disc and high-a metal-rich stars, as previously observed in dwarfs sample from HARPS. The present sample, as most of the giant star samples, also suffers from the B - V colour cut-off, which excludes low-log g stars with high metallicities, and high-log g star with low [Fe/H]. For future studies of planet occurrence dependence on stellar metallicity around these evolved stars, we suggest to use a subsample of stars in a 'cut-rectangle' in the log g-[Fe/H] diagram to overcome the aforementioned issue.
dc.description.funderEuropean Research Council/European Community
dc.description.funderGaia Research for European Astronomy Training (GREATITN) Marie Curie network - European Union Seventh Framework Programme
dc.description.funderFundacao para a Ciencia e a Tecnologia, FCT (Portugal)
dc.description.funderFCT
dc.description.funderPOPH/FSE (EC) by FEDER
dc.description.funderCNPq Brazilian agency
dc.description.funderFAPERN Brazilian agency
dc.description.funderINCT-INEspao
dc.description.funderCAPES brazilian agency
dc.description.funderIniciativa Cientifica Milenio
dc.description.funderSpanish Ministry project MINECO
dc.description.funderEuropean Union
dc.fechaingreso.objetodigital2024-05-03
dc.format.extent16 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stv716
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stv716
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/75839
dc.identifier.wosidWOS:000356338500060
dc.information.autorucFísica;Alves S;S/I;243001
dc.issue.numero2
dc.language.isoen
dc.nota.accesoSin adjunto
dc.pagina.final1915
dc.pagina.inicio1900
dc.publisherOXFORD UNIV PRESS
dc.revistaMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.rightsregistro bibliográfico
dc.subjectmethods: observational
dc.subjecttechniques: spectroscopic
dc.subjectstars: abundances
dc.subjectplanetary systems
dc.subjectSPECTROSCOPIC STELLAR PARAMETERS
dc.subjectPRECISE RADIAL-VELOCITIES
dc.subjectG-DWARF STARS
dc.subjectSOLAR NEIGHBORHOOD
dc.subjectMILKY-WAY
dc.subjectELEMENTAL ABUNDANCE
dc.subjectSEARCH PROGRAM
dc.subjectOPEN CLUSTERS
dc.subjectNEARBY STARS
dc.subjectRED GIANTS
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleChemical abundances and kinematics of 257 G-, K-type field giants. Setting a base for further analysis of giant-planet properties orbiting evolved stars
dc.typeartículo
dc.volumen450
sipa.codpersvinculados243001
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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