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Reconstructing the star formation history of the Solar neighbourhood with Gaia

Published online by Cambridge University Press:  02 August 2018

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

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Taking advantage of the Gaia DR1, we combined TGAS parallaxes with the 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. Our dynamically-evolved SFH is in excellent agreement with that calculated from the Hipparcos catalogue within 80 pc of the Sun, showing an enhanced star formation rate (SFR) in the past ~4 Gyr. We then correct the SFR for the disc thickening with age to obtain a SFR that is representative of the whole solar cylinder, and show that even with an extreme correction our results are not consistent with an exponentially decreasing SFR as found by recent studies. Finally, we discuss how this technique can 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.

Keywords

Hertzsprung-Russell diagramGalaxy: diskGalaxy: evolutionGalaxy: formationsolar neighbourhood
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 158 - 161
Copyright
Copyright © International Astronomical Union 2018 

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