The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data

Ioana Ciucă; Daisuke Kawata; Jane Lin; Luca Casagrande; George Seabroke; Mark Cropper

doi:10.1093/mnras/stx3285

The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data

Ioana Ciucă^*, Daisuke Kawata, Jane Lin, Luca Casagrande, George Seabroke, Mark Cropper

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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 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. The metallicity at disc plane remains almost constant between 2 and 8 Gyr, and it becomes significantly lower for the 8 < t ≤ 11 Gyr population. The current analysis also reveals that the intrinsic dispersion in metallicity increases steadily with age.We discuss that our results are consistent with a scenario that (thin) disc stars formed from a flaring (thin) star-forming disc.

Original language	English
Article number	stx3285
Pages (from-to)	1203-1212
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	475
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stx3285
Publication status	Published - 21 Mar 2018

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title = "The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data",

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 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. The metallicity at disc plane remains almost constant between 2 and 8 Gyr, and it becomes significantly lower for the 8 < t ≤ 11 Gyr population. The current analysis also reveals that the intrinsic dispersion in metallicity increases steadily with age.We discuss that our results are consistent with a scenario that (thin) disc stars formed from a flaring (thin) star-forming disc.",

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AU - Ciucă, Ioana

AU - Kawata, Daisuke

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AU - Casagrande, Luca

AU - Seabroke, George

AU - Cropper, Mark

PY - 2018/3/21

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AB - 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 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. The metallicity at disc plane remains almost constant between 2 and 8 Gyr, and it becomes significantly lower for the 8 < t ≤ 11 Gyr population. The current analysis also reveals that the intrinsic dispersion in metallicity increases steadily with age.We discuss that our results are consistent with a scenario that (thin) disc stars formed from a flaring (thin) star-forming disc.

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KW - Galaxy: Disc

KW - Galaxy: Evolution

KW - Galaxy: Formation

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The vertical metallicity gradients of mono-age stellar populations in the Milky Way with the RAVE and Gaia data

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