0000000000320512

AUTHOR

Michiel Cottaar

showing 3 related works from this author

Gaia -ESO Survey: Analysis of pre-main sequence stellar spectra

2015

This paper describes the analysis of UVES and GIRAFFE spectra acquired by the Gaia-ESO Public Spectroscopic Survey in the fields of young clusters whose population includes pre-main sequence (PMS) stars. Both methods that have been extensively used in the past and new ones developed in the contest of the Gaia-ESO survey enterprise are available and used. The internal precision of these quantities is estimated by inter-comparing the results obtained by such different methods, while the accuracy is estimated by comparison with independent external data, like effective temperature and surface gravity derived from angular diameter measurements, on a sample of benchmarks stars. Specific strategi…

Accuracy and precisionPopulationFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysicsstars: pre-main sequenceSurveysfundamental parameters [Stars]Astronomical spectroscopysurveysAngular diameterpre-main sequence [Stars]Astrophysics::Solar and Stellar AstrophysicsSurveydata analysis [Methods]educationSolar and Stellar Astrophysics (astro-ph.SR)Astrophysics::Galaxy AstrophysicsAstronomía y AstrofísicaPhysicseducation.field_of_studygeneral [Open clusters and associations][SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]Astronomy and AstrophysicsStars: fundamental parameterAstronomy and AstrophysicEffective temperatureopen clusters and associations: generalSurface gravitymethods: data analysisAccretion (astrophysics)StarsAstrophysics - Solar and Stellar AstrophysicsMethods: data analysis; Open clusters and associations: general; Stars: fundamental parameters; Stars: pre-main sequence; Surveys; Astronomy and Astrophysics; Space and Planetary ScienceSpace and Planetary Science[SDU]Sciences of the Universe [physics]open clusters and associations: general; surveys ; methods: data analysisAstrophysics::Earth and Planetary Astrophysicsstars: fundamental parametersMethods: data analysi
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The Gaia-ESO survey: Discovery of a spatially extended low-mass population in the Vela OB2 association

2015

The nearby (distance~350-400 pc), rich Vela OB2 association, includes $\gamma^2$ Velorum, one of the most massive binaries in the solar neighbourhood and an excellent laboratory for investigating the formation and early evolution of young clusters. Recent Gaia-ESO survey observations have led to the discovery of two kinematically distinct populations in the young (10-15 Myr) cluster immediately surrounding $\gamma^2$ Velorum. Here we analyse the results of Gaia-ESO survey observations of NGC 2547, a 35 Myr cluster located two degrees south of $\gamma^2$ Velorum. The radial velocity distribution of lithium-rich pre-main sequence stars shows a secondary population that is kinematically distin…

Stellar populationStars: Individual: Gamma2 velorumPopulationFOS: Physical sciencesTechniques: SpectroscopicAstrophysicsVela01 natural sciencesOpen clusters and associations: Individual: NGC 25470103 physical sciencesCluster (physics)educationStars: Pre-main sequence010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)QBOpen clusters and associations: Individual: Vela OB2Physicseducation.field_of_study010308 nuclear & particles physicsAstronomy and Astrophysicsstars: formation; stars: pre-main sequence; techniques: spectroscopicAstronomy and AstrophysicRadial velocityStarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceStars: FormationLow MassOpen clusters and associations: Individual: NGC 2547; Open clusters and associations: Individual: Vela OB2; Stars: Formation; Stars: Individual: Gamma2 velorum; Stars: Pre-main sequence; Techniques: Spectroscopic; Astronomy and Astrophysics; Space and Planetary Science
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The gaia-eso survey: dynamical analysis of the l1688 region in ophiuchus

2016

The Gaia ESO Public Spectroscopic Survey (GES) is providing the astronomical community with high-precision measurements of many stellar parameters including radial velocities (RVs) of stars belonging to several young clusters and star-forming regions. One of the main goals of the young cluster observations is to study of their dynamical evolution and provide insight into their future, revealing if they will eventually disperse to populate the field, rather than evolve into bound open clusters. In this paper we report the analysis of the dynamical state of L1688 in the $\rho$~Ophiuchi molecular cloud using the dataset provided by the GES consortium. We performed the membership selection of t…

Stars: formationPopulationFOS: Physical sciencesAstrophysics01 natural sciencesVirial theoremstars: pre-main sequence / open clusters and associations: individual: L1688 / stars: kinematics and dynamics / stars: formation0103 physical scienceseducation010303 astronomy & astrophysicsQCOpen clusters and associations: individual: L1688Solar and Stellar Astrophysics (astro-ph.SR)QBPhysicseducation.field_of_study010308 nuclear & particles physicsStar formationMolecular cloudVelocity dispersionAstronomy and AstrophysicsStars: kinematics and dynamicAstronomy and AstrophysicAstrophysics - Astrophysics of GalaxiesStarsAstrophysics - Solar and Stellar AstrophysicsSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)OphiuchusStars: pre-main sequenceOpen clusterAstronomy and Astrophysics
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