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Gaia DR1 completeness within 250 pc & star formation history of the Solar neighbourhood

Published online by Cambridge University Press:  07 March 2018

Edouard J. Bernard Open the ORCID record for Edouard J. Bernard [Opens in a new window]
Edouard J. Bernard*
Affiliation:
Université Côte dAzur, OCA, CNRS, Lagrange, France email: [email protected]
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Abstract

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We took advantage of the Gaia DR1 to combine TGAS parallaxes with Tycho-2 and APASS photometry to calculate the star formation history (SFH) of the solar neighbourhood within 250 pc using the colour-magnitude diagram fitting technique. We present the determination of the completeness within this volume, and compare the resulting SFH with that calculated from the Hipparcos catalogue within 80 pc of the Sun. We also show how this technique will be applied out to ~5 kpc thanks to the next Gaia data releases, which will allow us to quantify the SFH of the thin disc, thick disc and halo in situ, rather than extrapolating based on the stars from these components that are today in the solar neighbourhood.

Keywords

Hertzsprung-Russell diagramGalaxy: diskGalaxy: evolutionGalaxy: formationsolar neighbourhood
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 148 - 151
Copyright
Copyright © International Astronomical Union 2018 

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