O. Bienaymé

Joint inference of the Milky Way star formation history and IMF from Gaia all-sky $G < 13$ data

Marc del Alcázar‐Julià, F. Figueras, A. C. Robin, O. Bienaymé et autres

Despite the fundamental importance of the Milky Way's star formation history (SFH) and initial mass function (IMF), their consistent derivation remains elusive. We aim to simultaneously infer the IMF and the SFH of the Galactic disc comparing Gaia data with the mock …

Dark matter in the Milky Way: Measurements up to 3 kpc from the Galactic plane above the Sun

O. Bienaymé, A. C. Robin, J. -B. Salomon, C. Reylé

We probe the gravitational force perpendicular to the Galactic plane at the position of the Sun based on a sample of red giants, with measurements taken from the DR3 Gaia catalogue. Measurements far out of the Galactic plane up to 3.5 kpc …

A self-consistent dynamical model of the Milky Way disc adjusted toGaiadata

A. C. Robin, O. Bienaymé, J.-B. Salomon, C. Reylé et autres

Context.Accurate astrometry achieved byGaiafor many stars in the Milky Way provides an opportunity to reanalyse the Galactic stellar populations from a large and homogeneous sample and to revisit the Galaxy gravitational potential. Aims.This paper shows how a self-consistent dynamical model can be …

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Deciphering the evolution of the Milky Way discs: The Gaia APOGEE Kepler giant stars & Besan\c{c}on Galaxy Model

N. Lagarde, C. Reylé, C. Chiappini, R. Mor et autres

We investigate the properties of the double sequences of the Milky Way discs visible in the [$\alpha$/Fe] vs [Fe/H] diagram. In the framework of Galactic formation and evolution, we discuss the complex relationships between age, metallicity, [$\alpha$/Fe], and the velocity components. We …

A fully consistent dynamical model of the Milky Way facing Gaia data

A. C. Robin, O. Bienaymé, J.-B. Salomon, C. Reylé

The RAdial Velocity Experiment (RAVE): Parameterisation of RAVE spectra based on convolutional neural networks

G. Guiglion, G. Matijevič, A. B. A. Queiroz, M. Valentini et autres

Context. Data-driven methods play an increasingly important role in the field of astrophysics. In the context of large spectroscopic surveys of stars, data-driven methods are key in deducing physical parameters for millions of spectra in a short time. Convolutional neural networks (CNNs) …

de, se, fr, us, si, es, au, gb, ca, cn, hk (code pays fourni par la source)

Gaia Data Release 2

A. Helmi, F. van Leeuwen, P. J. McMillan, D. Massari et autres

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nl, gb, se, es, fr, de, it, ch, be, gr, us (code pays fourni par la source)

Kinematics and dynamics of Gaia red clump stars

J.-B. Salomon, O. Bienaymé, C. Reylé, A. C. Robin et autres

We analyse the kinematics and dynamics of a homogeneous sample of red clump stars selected from the second Gaia data release catalogue in the direction of the Galactic poles. The level of completeness of the sample at heights between 0.6 and 3.5 …

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The American Astronomical Society, find out more The Institute of Physics, find out moreThe Sixth Data Release of the Radial Velocity Experiment (Rave). II. Stellar Atmospheric Parameters, Chemical Abundances, and Distances

Matthias Steinmetz, G. Guiglion, PJ McMillan, G. Matijevič et autres

We present part 2 of the 6th and final Data Release (DR6 or FDR) of the Radial Velocity Experiment (RAVE), a magnitude-limited (9<I<12) spectroscopic survey of Galactic stars randomly selected in the southern hemisphere. The RAVE medium-resolution spectra (R~7500) cover the Ca-triplet …

VizieR Online Data Catalog: Stellar twins in RAVE with Gaia (Jofre+, 2017)

P. Jofré, G. Traven, Keith Hawkins, G. Gilmore et autres

Gaia Data Release 2

A. Helmi, F. van Leeuwen, P. J. McMillan, D. Massari et autres

0

nl, gb, se, es, fr, de, it, ch, be, gr, us (code pays fourni par la source)

Integrals of motion for non-axisymmetric potentials

O. Bienaymé

Context. The modelling of stationary galactic stellar populations can be performed using distribution functions. Aims. This paper aims to write explicit integrals of motion and distribution functions. Methods. We propose an analytic formulation of the integrals of motion with an explicit dependence …

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