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Last name: DE LAVERNY
First name: P.
Physica Scripta Volume T, 133, p. 4030, http://dx.doi.org./10.1088/0031-8949//t133/014030
Astronomy and Astrophysics, 461, pp. L13-L16, http://dx.doi.org./10.1051/0004-6361:20066552
Astronomy and Astrophysics, 481, pp. 161-168, http://dx.doi.org./10.1051/0004-6361:20079114
Context. The Gaia mission is a magnitude-limited whole-sky survey that collects an impressive quantity of astrometric, spectro-photometric and spectroscopic data. Among all the on-board instruments, the Radial Velocity Spectrometer (RVS) produces millions of spectra up to a magnitude of GRVS ~ 16. For the brightest RVS targets, stellar...
We present an automated procedure for the derivation of atmospheric parameters (T eff , log g, [M/H]) and individual chemical abundances from stellar spectra. The MATrix Inversion for Spectral SynthEsis (MATISSE) algorithm determines a basis, B θ (λ), allowing the derivation of a particular stellar parameter θ by projection of an observed...
Aims. We revisit large spectroscopic data sets for field stars from the literature to derive the upper Li envelope in the high metallicity regime in our Galaxy. Methods. We take advantage of Gaia EDR3 data and state-of-the-art stellar models to precisely determine the position of the sample dwarf stars in the Hertzsprung-Russell diagram....
Astronomy and Astrophysics, 466, pp. L1-L4, http://dx.doi.org./10.1051/0004-6361:7128
Astronomy and Astrophysics, 466, p. L1
International audience
Context. The chemical evolution of neutron capture elements in the Milky Way disc is still a matter of debate. There is a lack of statistically significant catalogues of such element abundances, especially those of the r-process.Aims. We aim to understand the chemical evolution of r-process elements in Milky Way disc. We focus on three pure...
Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity. Methods: .We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational velocity measurements available in the...
Context. The abundance of α-elements relative to iron ([α/Fe]) is an important fossil signature in Galactic archaeology for tracing the chemical evolution of disc stellar populations. High-precision chemical abundances, together with accurate stellar ages, distances, and dynamical data, are crucial to infer the Milky Way formation history.Aims:...
Context. The abundance of α-elements provides an important fossil signature in Galactic archaeology to trace the chemical evolution of the different disc populations. High-precision chemical abundances are crucial to improving our understanding of the chemodynamical properties present in the Galaxy. However, deriving precise abundance...
Aims.To investigate any correlation between Li abundances and rotational velocities among F-G evolved stars, we study a large sample of early F stars from the Bright Star Catalogue (BSC), most of them classified in the literature as giant stars.Methods.Physical parameters and Li abundances are estimated for each star, often for the first time,...
Chemical abundance dating methods open new paths for temporal evolution studies of the Milky Way stellar populations. In this paper, we use a high spectral resolution database of turn-off stars in the solar neighbourhood to study the age dependence of the [Y/Mg] chemical abundance ratio. Our analysis reveals a clear correlation between [Y/Mg]...
Context. The pattern of chemical abundance ratios in stellar populations of the Milky Way is a fingerprint of the Galactic chemical history. In order to interpret such chemical fossils of Galactic archaeology, chemical evolution models have to be developed. However, despite the complex physics included in the most recent models, significant...
Context. Recent observations suggest a double-branch behaviour of Li/H versus metallicity in the local thick and thin discs. This is reminiscent of the corresponding O/Fe versus Fe/H behaviour, which has been explained as resulting from radial migration in the Milky Way disc. Aims. We study here the role of radial migration in shaping these...
International audience
Astronomy and Astrophysics, 439, pp. 227-235, http://dx.doi.org./10.1051/0004-6361:20041805
Astrophysical Journal, 694, pp. 971-977 (2009)
International audience
Publications of the Astronomical Society of Australia, 26, pp. 351-353 (2009)
We analyze 494 main sequence turnoff and subgiant stars from the AMBRE:HARPS survey. These stars have accurate astrometric information from Gaia DR1, providing reliable age estimates with relative uncertainties of ±1 or 2 Gyr and allowing precise orbital determinations. The sample is split based on chemistry into a low-[Mg/Fe] sequence, which...
International audience
Context. Sulfur is a volatile chemical element that plays an important role in tracing the chemical evolution of the Milky Way and external galaxies. However, its nucleosynthesis origin and abundance variations in the Galaxy are still unclear because the number of available stellar sulfur abundance measurements is currently rather small.Aims....