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Sökning: WFRF:(Koposov R) > Stockholms universitet

  • Resultat 1-4 av 4
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1.
  • Gilmore, G., et al. (författare)
  • The Gaia-ESO Public Spectroscopic Survey : Motivation, implementation, GIRAFFE data processing, analysis, and final data products star
  • 2022
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 666
  • Tidskriftsartikel (refereegranskat)abstract
    • Context. The Gaia-ESO Public Spectroscopic Survey is an ambitious project designed to obtain astrophysical parameters and elemental abundances for 100 000 stars, including large representative samples of the stellar populations in the Galaxy, and a well-defined sample of 60 (plus 20 archive) open clusters. We provide internally consistent results calibrated on benchmark stars and star clusters, extending across a very wide range of abundances and ages. This provides a legacy data set of intrinsic value, and equally a large wide-ranging dataset that is of value for the homogenisation of other and future stellar surveys and Gaia's astrophysical parameters. Aims. This article provides an overview of the survey methodology, the scientific aims, and the implementation, including a description of the data processing for the GIRAFFE spectra. A companion paper introduces the survey results. Methods. Gaia-ESO aspires to quantify both random and systematic contributions to measurement uncertainties. Thus, all available spectroscopic analysis techniques are utilised, each spectrum being analysed by up to several different analysis pipelines, with considerable effort being made to homogenise and calibrate the resulting parameters. We describe here the sequence of activities up to delivery of processed data products to the ESO Science Archive Facility for open use. Results. The Gaia-ESO Survey obtained 202 000 spectra of 115 000 stars using 340 allocated VLT nights between December 2011 and January 2018 from GIRAFFE and UVES. Conclusions. The full consistently reduced final data set of spectra was released through the ESO Science Archive Facility in late 2020, with the full astrophysical parameters sets following in 2022. A companion article reviews the survey implementation, scientific highlights, the open cluster survey, and data products.
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2.
  • Randich, S., et al. (författare)
  • The Gaia-ESO Public Spectroscopic Survey : Implementation, data products, open cluster survey, science, and legacy
  • 2022
  • Ingår i: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 666
  • Tidskriftsartikel (refereegranskat)abstract
    • Context. In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with the general aim of delivering stellar parameters and elemental abundances for large samples of Galactic stars, complementing Gaia astrometry. Among those surveys, the Gaia-ESO Public Spectroscopic Survey, the only one performed on a 8m class telescope, was designed to target 100 000 stars using FLAMES on the ESO VLT (both Giraffe and UVES spectrographs), covering all the Milky Way populations, with a special focus on open star clusters. Aims. This article provides an overview of the survey implementation (observations, data quality, analysis and its success, data products, and releases), of the open cluster survey, of the science results and potential, and of the survey legacy. A companion article reviews the overall survey motivation, strategy, Giraffe pipeline data reduction, organisation, and workflow. Methods. We made use of the information recorded and archived in the observing blocks; during the observing runs; in a number of relevant documents; in the spectra and master catalogue of spectra; in the parameters delivered by the analysis nodes and the working groups; in the final catalogue; and in the science papers. Based on these sources, we critically analyse and discuss the output and products of the Survey, including science highlights. We also determined the average metallicities of the open clusters observed as science targets and of a sample of clusters whose spectra were retrieved from the ESO archive. Results. The Gaia-ESO Survey has determined homogeneous good-quality radial velocities and stellar parameters for a large fraction of its more than 110 000 unique target stars. Elemental abundances were derived for up to 31 elements for targets observed with UVES. Lithium abundances are delivered for about 1/3 of the sample. The analysis and homogenisation strategies have proven to be successful; several science topics have been addressed by the Gaia-ESO consortium and the community, with many highlight results achieved. Conclusions. The final catalogue will be released through the ESO archive in the first half of 2022, including the complete set of advanced data products. In addition to these results, the Gaia-ESO Survey will leave a very important legacy, for several aspects and for many years to come.
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3.
  • Thompson, T.M, et al. (författare)
  • Genetic variation in DRD4, criminality and conduct disorder
  • 2011
  • Ingår i: Personality and individual differences. - New York : Nova Science Publishers Inc.. - 9781611225884
  • Bokkapitel (refereegranskat)abstract
    • Personality and individual differences research is relevant to practically every facet of human existence. For instance, since theories of persons either explicitly or implicitly guide clinical work, the field contributes to discussions of understanding abnormal psychology and provides a guide for conceptualising best treatment. Additionally, the field is relevant to understanding human development across the lifespan, and our understanding of personality and individual differences impacts upon our views of socialisation and interpersonal relations. This book presents research which draws attention to the rich scientific literature that continues to emerge with respect to personality and individual differences psychology.
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4.
  • Wiklund, G, et al. (författare)
  • Impulsivity Research: New Data and Future Perspectives and presenter of Pro-bullying attitudes among incarcerated juvenile offenders: The relation to delinquency, aggression, psychopathy and violence.
  • 2006
  • Ingår i: The International Society for the Study of Impulsivity (ISRI) Regional Workshop.
  • Konferensbidrag (populärvet., debatt m.m.)abstract
    • A new scale to assess pro-bullying attitudes, the Pro-Bullying Attitude Scale (PAS) was evaluated in 259 voluntarily recruited male juvenile delinquents in Russia. Exploratory factor analysis gave a two-factor solution: Callous Dominance (CD) and Manipulativeness/ Impulsiveness (MI). The subjects were divided into three groups (low, intermediate, high) according to their scores on PAS and its two factors. Low and high group Ss were compared and results indicated higher delinquent and aggressive behavior among high group Ss as assessed by the Youth Self Report (YSR) and violent behavior as assessed by the Antisocial Behavior Checklist (ABC), as well as higher scores on the personality trait Novelty seeking and lower on Cooperativeness as assessed by the Temperament and Character Inventory (Cloninger et al., 1994). High PAS and CD groups displayed significantly higher scores on psychopathy traits as assessed by the Childhood Psychopathy Scale (Lynam, 1997) significantly related to registered violent crime. Probullying attitudes are discussed as a link between personality and psychopathy on the one hand and antisocial and violent behavior on the other. The PAS is also discussed in terms of usefulness in identifying high-risk individuals for violent behavior among incarcerated delinquents and in preventing violence and bullying tendencies in juvenile forensic institutions.
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  • Resultat 1-4 av 4

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