EAS Publications Series
Volume 2, 2002GAIA: A European Space Project
|Page(s)||39 - 54|
|Section||Section I: GAIA: Unprecedented Performance|
|Published online||25 September 2002|
O. Bienaymé and C. Turon (eds)
EAS Publications Series, 2 (2002) 39-54
GAIA Spectroscopy and Radial Velocities
Osservatorio Astronomico di Padova,
Sede di Asiago, 36012 Asiago (VI), Italy
GAIA spectroscopic and radial velocity performances are reviewed on the base of ground-based 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 colourful provided the spectral dispersion is high enough. A higher dispersions also favors a given precision of radial velocities to be reached at fainter magnitudes: for example, with current parameters for GAIA spectrograph, a 1 km s-1 accuracy on individual epoch RVs of a K0 star is reached at V~13.0 mag with 0.25 Å/pix dispersion spectra, at V~10.3 mag for 0.5 Å/pix, and V~6.7 mag for 1 Å/pix. GAIA radial velocities for single stars can match the ~0.5km s-1 mean accuracy of tangential motions at V=15 mag, provided the observations are performed at a dispersion not less than 0.5 Å/pix.
© EAS, EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.