Search Publications
Gaia FGK benchmark stars: Metallicity
Montes, D.; de Laverny, P.; Cantat-Gaudin, T. +22 more
Context. To calibrate automatic pipelines that determine atmospheric parameters of stars, one needs a sample of stars, or "benchmark stars", with well-defined parameters to be used as a reference.
Aims: We provide detailed documentation of the iron abundance determination of the 34 FGK-type benchmark stars that are selected to be the pillars …
The Besançon Galaxy model renewed. I. Constraints on the local star formation history from Tycho data
Luri, X.; Figueras, F.; Haywood, M. +2 more
Context. The understanding of Galaxy evolution can be facilitated by the use of population synthesis models, which allows us to test hypotheses on the star formation history, star evolution, and chemical and dynamical evolution of the Galaxy.
Aims: The new version of the Besançon Galaxy model (BGM) aims to provide a more flexible and powerful…
The Gaia FGK benchmark stars. High resolution spectral library
Soubiran, C.; Heiter, U.; Blanco-Cuaresma, S. +1 more
Context. An increasing number of high-resolution stellar spectra is available today thanks to many past and ongoing spectroscopic surveys. Consequently, numerous methods have been developed to perform an automatic spectral analysis on a massive amount of data. When reviewing published results, biases arise and they need to be addressed and minimiz…
Gaia photometry for white dwarfs
Jordi, C.; Luri, X.; Carrasco, J. M. +5 more
Context. White dwarfs can be used to study the structure and evolution of the Galaxy by analysing their luminosity function and initial mass function. Among them, the very cool white dwarfs provide the information for the early ages of each population. Because white dwarfs are intrinsically faint only the nearby (~ 20 pc) sample is reasonably comp…
Joint astrometric solution of HIPPARCOS and Gaia. A recipe for the Hundred Thousand Proper Motions project
Michalik, Daniel; Lindegren, Lennart; Hobbs, David +1 more
Context. The first release of astrometric data from Gaia is expected in 2016. It will contain the mean stellar positions and magnitudes from the first year of observations. For more than 100 000 stars in common with the Hipparcos Catalogue it will be possible to compute very accurate proper motions due to the time difference of about 24 years betw…
Overview and stellar statistics of the expected Gaia Catalogue using the Gaia Object Generator
Jordi, C.; Luri, X.; Arenou, F. +13 more
Aims: An effort has been made to simulate the expected Gaia Catalogue, including the effect of observational errors. We statistically analyse this simulated Gaia data to better understand what can be obtained from the Gaia astrometric mission. This catalogue is used to investigate the potential yield in astrometric, photometric, and spectrosc…
The initial Gaia source list
Smart, R. L.; Nicastro, L.
Aims: We describe the production of the Initial Gaia Source List (IGSL) used both as the starting point for observation-matching in the Gaia data processing and as a comparison catalog to trigger early science alerts.
Methods: The IGSL was compiled from large scale public catalogs and a few specific catalogs provided by the Gaia Consorti…
Vertical velocities from proper motions of red clump giants
López-Corredoira, M.; Figueras, F.; Garzón, F. +1 more
Aims: We derive the vertical velocities of disk stars in the range of Galactocentric radii of R = 5 - 16 kpc within 2 kpc in height from the Galactic plane. This kinematic information is connected to dynamical aspects in the formation and evolution of the Milky Way, such as the passage of satellites and vertical resonance and determines wheth…
Detection of galaxies with Gaia
Ducourant, C.; Krone-Martins, A.; Teixeira, R. +2 more
Aims: Besides its major objective tuned to detecting the stellar galactic population, the Gaia mission experiment will also observe a large number of galaxies. In this work we intend to evaluate the number and the characteristics of the galaxies that will effectively pass the on-board selection algorithm of Gaia.
Methods: The detection o…
A multi-method approach to radial-velocity measurement for single-object spectra
Gosset, E.; Damerdji, Y.; Katz, D. +5 more
Context. The derivation of radial velocities from large numbers of spectra that typically result from survey work, requires automation. However, except for the classical cases of slowly rotating late-type spectra, existing methods of measuring Doppler shifts require fine-tuning to avoid a loss of accuracy due to the idiosyncrasies of individual sp…