Vertical distribution of Galactic disk stars IV - AMR and AVR from clump giants
SOUBIRAN, C.
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
MISHENINA, T. V.
Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
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Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
SOUBIRAN, C.
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
MISHENINA, T. V.
Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
KOVTYUKH, V. V.
Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
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Astronomical observatory of Odessa National University [Odessa]
Odessa Astronomical Observatory
Idioma
en
Article de revue
Este ítem está publicado en
Astronomy and Astrophysics - A&A. 2008, vol. 480, p. 91-101
EDP Sciences
Resumen en inglés
We present the parameters of 891 stars, mostly clump giants, including atmospheric parameters, distances, absolute magnitudes, spatial velocities, galactic orbits and ages. One part of this sample consists of local giants, ...Leer más >
We present the parameters of 891 stars, mostly clump giants, including atmospheric parameters, distances, absolute magnitudes, spatial velocities, galactic orbits and ages. One part of this sample consists of local giants, within 100 pc, with atmospheric parameters either estimated from our spectroscopic observations at high resolution and high signal-to-noise ratio, or retrieved from the literature. The other part of the sample includes 523 distant stars, which we have estimated atmospheric parameters from high resolution but low signal-to-noise Echelle spectra. This new sample is kinematically unbiased, with well-defined boundaries in magnitude and colours. We revisit the basic properties of the Galactic thin disk as traced by clump giants. We find the metallicity distribution to be different from that of dwarfs, with less metal-rich stars. We find evidence for a vertical metallicity gradient of -0.31 dex/kpc and for a transition at 4-5 Gyr in both the metallicity and velocities. The age - metallicity relation (AMR), which exhibits a very low dispersion, increases smoothly from 10 to 4 Gyr, with a steeper increase for younger stars. The age-velocity relation (AVR) is characterized by the saturation of the V and W dispersions at 5 Gyr, and continuous heating in U.< Leer menos
Palabras clave en inglés
Stars: kinematics
Stars: fundamental parameters
Galaxy: disk
Galaxy: structure
Solar neighbourhood
Orígen
Importado de HalCentros de investigación