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The vertical metallicity gradients of mono-age stellar populations in the Milky Way thin disk

Published online by Cambridge University Press:  02 August 2018

Ioana Ciucă
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK email: ioana.ciuca.16@ucl.ac.uk
Daisuke Kawata
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK email: ioana.ciuca.16@ucl.ac.uk
Jane Lin
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra ACT 2611, Australia
Luca Casagrande
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Canberra ACT 2611, Australia
George Seabroke
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK email: ioana.ciuca.16@ucl.ac.uk
Mark Cropper
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK email: ioana.ciuca.16@ucl.ac.uk
Corresponding
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Abstract

We investigate the vertical metallicity gradients of five mono-age stellar populations between 0 and 11 Gyr for a sample of 18 435 dwarf stars selected from the cross-matched Tycho-Gaia Astrometric Solution (TGAS) and RAdial Velocity Experiment (RAVE) Data Release 5. We find a correlation between the vertical metallicity gradients and age, with no vertical metallicity gradient in the youngest population and an increasingly steeper negative vertical metallicity gradient for the older stellar populations. We also find that the intrinsic dispersion in metallicity increases steadily with age. Our results are consistent with a scenario that thin disk stars formed from a flaring thin star-forming disk.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

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