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

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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. (author): Univ Sao Paulo, Dept Astron, Rua Matao 1226, BR-05509900 Sao Paulo, SP, Brazil.,University of São Paulo

Randich, S. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri,Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences

Magrini, L. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Jeffries, R. D. (author): Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England.,Keele University

Friel, E. D. (author): Indiana Univ, Dept Astron, Bloomington, IN 47405 USA.,Indiana University

Sacco, G. G. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri

Pancino, E. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.;ASI Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.,INAF - Osservatorio Astrofisico di Arcetri,Italian Space Agency

Bonito, R. (author): Osserv Astron Palermo, INAF, P zza Parlamento 1, I-90134 Palermo, Italy.;Univ Palermo, Dipartimento Fis & Chim, Pzza Parlamento 1, I-90134 Palermo, Italy.,University of Palermo

Bravi, L. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.

Franciosini, E. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.

Klutsch, A. (author): Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy.,University of Catania

Montes, D. (author): Univ Complutense Madrid, Fac CC Fis, Dpto Astrofis, E-28040 Madrid, Spain.,Complutense University of Madrid

Gilmore, G. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.

Vallenari, A. (author): INAF, Padova Observ, Vicolo Osservatorio 5, I-35122 Padua, Italy.

Bensby, T. (author): Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science

Bragaglia, A. (author): Osservatorio Astron Bologna, INAF, Via Ranzani 1, I-40127 Bologna, Italy.

Flaccomio, E. (author): Osserv Astron Palermo, INAF, P zza Parlamento 1, I-90134 Palermo, Italy.

Koposov, S. E. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.;Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia.,Lomonosov Moscow State University

Korn, Andreas J., 1972- (author): Uppsala University,Uppsala universitet,Observationell astrofysik

Lanzafame, A. C. (author): Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy.;Osserv Astrofis Catania, INAF, Via S Sofia 78, I-95123 Catania, Italy.,University of Catania

Smiljanic, R. (author): Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland.

Bayo, A. (author): Univ Valparaiso, Inst Fis & Astron, Valparaiso, Chile.,University of Valparaíso

Carraro, G. (author): European So Observ, Alonso De Cordova 3107 Vitacura, Santiago, Chile.

Casey, A. R. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.

Costado, M. T. (author): CSIC, Inst Astrofis Andalucia, Apdo 3004, E-18080 Granada, Spain.

Damiani, F. (author): Osserv Astron Palermo, INAF, P zza Parlamento 1, I-90134 Palermo, Italy.

Donati, P. (author): Osservatorio Astron Bologna, INAF, Via Ranzani 1, I-40127 Bologna, Italy.

Frasca, A. (author): Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy.,University of Catania

Hourihane, A. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.

Jofre, P. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.;Univ Diego Port, Fac Ingn, Nucleo Astron, Av Ejercito 441, Santiago, Chile.

Lewis, J. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.

Lind, K. (author): Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.,Max Planck Institute for Astronomy

Monaco, L. (author): Univ Andres Bello, Dept Ciencias Fisicas, Republ 220, Santiago, Chile.

Morbidelli, L. (author): Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy.

Prisinzano, L. (author): Osserv Astron Palermo, INAF, P zza Parlamento 1, I-90134 Palermo, Italy.

Sousa, S. G. (author): Univ Porto, CAUP, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Oporto, Portugal.

Worley, C. C. (author): Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.

Zaggia, S. (author): INAF, Padova Observ, Vicolo Osservatorio 5, I-35122 Padua, Italy.,INAF - Osservatorio Astronomico di Padova

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Univ Sao Paulo, Dept Astron, Rua Matao 1226, BR-05509900 Sao Paulo, SP, Brazil University of São Paulo (creator_code:org_t)

2017-05-04
2017
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 601

Related links:: https://www.aanda.or...; show more...; http://dx.doi.org/10...; https://urn.kb.se/re...; https://doi.org/10.1...; https://lup.lub.lu.s...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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.

Subject headings

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

stars: abundances
stars: pre-main sequence
Galaxy: abundances
Galaxy: disk
Galaxy: evolution
open clusters and associations: general
Galaxy: Abundances
Galaxy: disk
Galaxy: evolution
Open clusters and associations: general
Stars: Abundances
Stars: pre-main sequence

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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