Radial distribution of stellar motions in Gaia DR2

Stellar Rotation from GAIA Spectra

Abstract. Stellar rotation influences our understanding of stellar structure and evolution, binary systems, clusters etc. and therefore the benefits of a large and highly accurate database on stellar rotation, obtained by GAIA, will be manifold. To study the prospects of GAIA measurement of projected rotational velocities vrot sin i, we use synthetic stellar spectra to simulate the determinatio...

GAIA Spectroscopy and Radial Velocities

GAIA spectroscopic and radial velocity performancies are reviewed on the base of groundbased test observations and simulations. The prospects for accurate analysis of stellar atmospheres (temperature, gravity, chemical abundances, rotation, peculiarities) and precise radial velocities (single stars, binaries, pulsating stars) are colorful provided the spectral dispersion is high enough. A highe...

Probing the Radial Distribution of the Kuiper Belt using Stellar

Introduction: The Trans-Neptunian Objects (TNOs) are the frozen leftovers from the formation period of the outer solar system [1]. The current total mass in the Kuiper Belt is estimated to be around 0.03-0.3 Earth masses [2], but there is evidence that a much larger mass (10-40 M Earth) was originally present at the time of formation [3]. The direct observation of the TNOs does not allow reachi...

On the accuracy of GAIA radial velocities

We have obtained 782 real spectra and used them as inputs for 6700 automatic crosscorrelation runs to investigate GAIA potential in terms of radial velocity accuracy. We have explored the dispersions 0.25, 0.5, 1 and 2 Å/pix over the 8490–8740 Å GAIA range. We have investigated late-F to early-M stars (constituting the vast majority of GAIA targets), slowly rotating (< Vrot sin i > = 4 km sec )...

Hydrodynamical Description of Stellar Motions