Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..315l&link_type=abstract
SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,
Astronomy and Astrophysics
Astrophysics
Gaia, Astrometry, Luminosity Calibration, Distance Scale
Scientific paper
The upcoming availability of the Gaia mission data will prompt a significant advancement in many areas of astrophysics and will specially have a huge impact in the determination of luminosity calibration and distances, thanks to the availability of very precise parallaxes. Already the Hipparcos mission made a huge improvement in these areas with respect to the previous eras, but the advent of Gaia will represent an even larger improvement: the Gaia catalogue will contain about a billion objects, with more than 100 million of them with distances known to better than 10%, all over the Galaxy. All stellar distance indicators will be directly measured in very large number, providing a direct calibration of their luminosity and making possible detailed studies of the impacts of various effects linked to chemical element abundances or cluster membership. Furthermore, Gaia astrometry will be precise enough to reach the Large and Small Magellanic Clouds, allowing for the first time a direct parallax estimation of its distances. In this paper we will review with the help of simulations the potential contributions of Gaia in these areas.
Luri Xavier
Turon Catherine
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