Author: "deLaverny, P." / Database: Academic Search Index - Searchworks@Jio Institute Digital Library Search Results

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Author: Kordopatis, G., Recio-Blanco, A., deLaverny, P., Gilmore, G., Hill, V., Wyse, R. F. G., Helmi, A., Bijaoui, A., Ordenovic, C., and Bienaymé, M. Zoccali O.
Subjects: *STELLAR orbits, *ATMOSPHERIC circulation, *SIMULATION methods & models, *ATMOSPHERIC physics, MOTION of the solar system in space
Abstract: A spectroscopic survey of nearly 700 stars probing the Galactic Thick Disc far from the Solar neighbourhood is performed. The MATISSE (MATrix Inversion for Spectral SynthEsis) algorithm is developed and trained in order to automatically obtain atmospheric parameters of stars. The derived effective temperatures, surface gravities and overall metallicities are then combined to stellar evolution isochrones, radial velocities and proper motions to derive the distances, kinematics and orbital parameters of the sample stars. Results are compared with simulations from the Besançon model of the Milky Way. [ABSTRACT FROM AUTHOR]
Published: 2010
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Author: Kordopatis, G., Recio-Blanco, A., deLaverny, P., Bijaoui, A., Hill, V., Gilmore, G., Wyse, R. F. G., and Ordenovic, C.
Subjects: *STELLAR spectra, *ASTRONOMICAL spectroscopy, *SPECTROGRAPHS, *KINEMATICS
Abstract: Degeneracies in the stellar atmospheric parameters can pollute large spectroscopic surveys, introducing possible biases in the derived distances, kinematics and chemical abundances. We focus at the wavelength range shared by RAVE, the RVS of Gaia and the ESO-FLAMES/GIRAFFE spectrograph setups LR8 and HR21. Based on the algorithms DEGAS and MATISSE, trained on a grid of synthetic spectra, we propose a pipeline in order to derive the atmospheric parameters. [ABSTRACT FROM AUTHOR]
Published: 2012
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