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Spectroscopic investigation of stars on the lower main sequence

hal.structure.identifierOdessa Astronomical Observatory
hal.structure.identifierAstronomical observatory of Odessa National University [Odessa]
dc.contributor.authorMISHENINA, T. V.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorSOUBIRAN, C.
hal.structure.identifierObservatoire astronomique de Strasbourg [ObAS]
hal.structure.identifierObservatoire astronomique de Strasbourg [OAS]
dc.contributor.authorBIENAYMÉ, O.
hal.structure.identifierAstronomical observatory of Odessa National University [Odessa]
dc.contributor.authorKOROTIN, S. A.
hal.structure.identifierOdessa Astronomical Observatory
dc.contributor.authorBELIK, S. I.
hal.structure.identifierOdessa Astronomical Observatory
dc.contributor.authorUSENKO, I. A.
hal.structure.identifierOdessa Astronomical Observatory
hal.structure.identifierAstronomical observatory of Odessa National University [Odessa]
dc.contributor.authorKOVTYUKH, V. V.
dc.date.issued2008
dc.identifier.issn0004-6361
dc.description.abstractEnAims. The aim of this paper is to provide fundamental parameters and abundances with a high accuracy for a large sample of cool main sequence stars. This study is part of wider project, in which the metallicity distribution of the local thin disc is investigated from a complete sample of G and K dwarfs within 25 pc. Methods: The stars were observed at high resolution and a high signal-to-noise ratio with the ELODIE echelle spectrograph. The V sin i were obtained with a calibration of the cross-correlation function. Effective temperatures were estimated by the line depth ratio method. Surface gravities (log g) were determined by two methods: parallaxes and ionization balance of iron. The Mg and Na abundances were derived using a non-LTE approximation. Abundances of other elements were obtained by measuring equivalent widths. Results: Rotational velocities, atmospheric parameters (T_eff, log g, [Fe/H], V_t), and Li, O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Co, Ni, and Zn abundances are provided for 131 stars. Among them, more than 30 stars are active stars with a fraction of BY Dra and RS CVn type stars for which spectral peculiarities were investigated. We find the mean abundances of the majority of elements in active and nonactive stars to be similar, except for Li, and possibly for Zn and Co. The lithium is reliably detected in 54% of active stars but only in 20% of nonactive stars. No correlation is found between Li abundances and rotational velocities. A possible anticorrelation of log A(Li) with the index of chromospheric activity GrandS is observed. Conclusions: Active and nonactive cool dwarfs show similar dependencies of most elemental ratios vs. [Fe/H]. This allows us to use such abundance ratios to study the chemical and dynamical evolution of the Galaxy. Among active stars, no clear correlation has been found between different indicators of activity for our sample stars. Based on spectra collected with the ELODIE spectrograph at the 1.93-m telescope of the Observatoire de Haute Provence (France). Tables A.1-A3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/489/923
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enSpectroscopic investigation of stars on the lower main sequence
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:200810360
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page923-930
bordeaux.volume489
bordeaux.peerReviewedoui
hal.identifierhal-00332580
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00332580v1
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