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The Gaia-ESO Survey : The present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters

Spina, L.; Randich, S.; Magrini, L.; Jeffries, R. D.; Friel, E. D.; Sacco, G. G.; Pancino, E.; Bonito, R.; Bravi, L. and Franciosini, E., et al. (2017) In Astronomy and Astrophysics 601.
Abstract

Context. The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open star clusters allow us to derive both the radial metallicity distribution and its evolution over time. Aims. In this paper we perform the first investigation of the present-day radial metallicity distribution based on [Fe/H] determinations in late type members of pre-main-sequence clusters. Because of their youth, these clusters are therefore essential for tracing the current interstellar medium metallicity. Methods. We used the products of the Gaia-ESO Survey analysis of 12 young regions (age < 100 Myr), covering Galactocentric distances from 6.67 to 8.70 kpc. For the first time, we... (More)

Context. The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open star clusters allow us to derive both the radial metallicity distribution and its evolution over time. Aims. In this paper we perform the first investigation of the present-day radial metallicity distribution based on [Fe/H] determinations in late type members of pre-main-sequence clusters. Because of their youth, these clusters are therefore essential for tracing the current interstellar medium metallicity. Methods. We used the products of the Gaia-ESO Survey analysis of 12 young regions (age < 100 Myr), covering Galactocentric distances from 6.67 to 8.70 kpc. For the first time, we derived the metal content of star forming regions farther than 500 pc from the Sun. Median metallicities were determined through samples of reliable cluster members. For ten clusters the membership analysis is discussed in the present paper, while for other two clusters (i.e. Chamaeleon I and Gamma Velorum) we adopted the members identified in our previous works. Results. All the pre-main-sequence clusters considered in this paper have close-To-solar or slightly sub-solar metallicities. The radial metallicity distribution traced by these clusters is almost flat, with the innermost star forming regions having [Fe/H] values that are 0.10-0.15 dex lower than the majority of the older clusters located at similar Galactocentric radii. Conclusions. This homogeneous study of the present-day radial metallicity distribution in the Galactic thin disc favours models that predict a flattening of the radial gradient over time. On the other hand, the decrease of the average [Fe/H] at young ages is not easily explained by the models. Our results reveal a complex interplay of several processes (e.g. star formation activity, initial mass function, supernova yields, gas flows) that controlled the recent evolution of the Milky Way.

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subject
keywords
Galaxy: Abundances, Galaxy: disk, Galaxy: evolution, Open clusters and associations: general, Stars: Abundances, Stars: pre-main sequence
in
Astronomy and Astrophysics
volume
601
publisher
EDP Sciences
external identifiers
  • scopus:85019042615
  • wos:000402313500070
ISSN
0004-6361
DOI
10.1051/0004-6361/201630078
language
English
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yes
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8acdc9b6-1834-4af3-8249-37b9e99664e4
date added to LUP
2017-06-01 08:01:58
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2018-01-07 12:05:47
@article{8acdc9b6-1834-4af3-8249-37b9e99664e4,
  abstract     = {<p>Context. The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open star clusters allow us to derive both the radial metallicity distribution and its evolution over time. Aims. In this paper we perform the first investigation of the present-day radial metallicity distribution based on [Fe/H] determinations in late type members of pre-main-sequence clusters. Because of their youth, these clusters are therefore essential for tracing the current interstellar medium metallicity. Methods. We used the products of the Gaia-ESO Survey analysis of 12 young regions (age &lt; 100 Myr), covering Galactocentric distances from 6.67 to 8.70 kpc. For the first time, we derived the metal content of star forming regions farther than 500 pc from the Sun. Median metallicities were determined through samples of reliable cluster members. For ten clusters the membership analysis is discussed in the present paper, while for other two clusters (i.e. Chamaeleon I and Gamma Velorum) we adopted the members identified in our previous works. Results. All the pre-main-sequence clusters considered in this paper have close-To-solar or slightly sub-solar metallicities. The radial metallicity distribution traced by these clusters is almost flat, with the innermost star forming regions having [Fe/H] values that are 0.10-0.15 dex lower than the majority of the older clusters located at similar Galactocentric radii. Conclusions. This homogeneous study of the present-day radial metallicity distribution in the Galactic thin disc favours models that predict a flattening of the radial gradient over time. On the other hand, the decrease of the average [Fe/H] at young ages is not easily explained by the models. Our results reveal a complex interplay of several processes (e.g. star formation activity, initial mass function, supernova yields, gas flows) that controlled the recent evolution of the Milky Way.</p>},
  articleno    = {A79},
  author       = {Spina, L. and Randich, S. and Magrini, L. and Jeffries, R. D. and Friel, E. D. and Sacco, G. G. and Pancino, E. and Bonito, R. and Bravi, L. and Franciosini, E. and Klutsch, A. and Montes, D. and Gilmore, G. and Vallenari, A and Bensby, T. and Bragaglia, A. and Flaccomio, E. and Koposov, S. E. and Korn, A. J. and Lanzafame, A. C. and Smiljanic, R. and Bayo, A and Carraro, G. and Casey, A. R. and Costado, M. T. and Damiani, F. and Donati, P. and Frasca, A. and Hourihane, A. and Jofré, P. and Lewis, J and Lind, K. and Monaco, L. and Morbidelli, L. and Prisinzano, L. and Sousa, S. G. and Worley, C. C. and Zaggia, S.},
  issn         = {0004-6361},
  keyword      = {Galaxy: Abundances,Galaxy: disk,Galaxy: evolution,Open clusters and associations: general,Stars: Abundances,Stars: pre-main sequence},
  language     = {eng},
  month        = {05},
  publisher    = {EDP Sciences},
  series       = {Astronomy and Astrophysics},
  title        = {The Gaia-ESO Survey : The present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters},
  url          = {http://dx.doi.org/10.1051/0004-6361/201630078},
  volume       = {601},
  year         = {2017},
}