The Gaia-ESO Survey: Evidence of atomic diffusion in M67?

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Investigating the chemical homogeneity of stars born from the same molecular cloud at virtually the same time is very important for our understanding of the chemical enrichment of the interstellar medium and with it the chemical evolution of the Galaxy. One major cause of inhomogeneities in the abundances of open clusters is stellar evolution of the cluster members. In this work, we investigate variations in the surface chemical composition of member stars of the old open clusterM67 as a possible consequence of atomic diffusion effects taking place during the main-sequence phase. The abundances used are obtained from high-resolution UVES/FLAMES spectra within the framework of the Gaia-ESO Survey. We find that the surface abundances of stars on the main sequence decrease with increasing mass reaching a minimum at the turn-off. After deepening of the convective envelope in subgiant branch stars, the initial surface abundances are restored.We found themeasured abundances to be consistent with the predictions of stellar evolutionary models for a cluster with the age and metallicity of M67. Our findings indicate that atomic diffusion poses a non-negligible constraint on the achievable precision of chemical tagging methods.

Detaljer

Författare
  • C. Bertelli Motta
  • A. Pasquali
  • J. Richer
  • G. Michaud
  • M. Salaris
  • A. Bragaglia
  • L. Magrini
  • S. Randich
  • E. K. Grebel
  • V. Adibekyan
  • S. Blanco-Cuaresma
  • A. Drazdauskas
  • X. Fu
  • S. Martell
  • G. Tautvaišiene
  • G. Gilmore
  • E. J. Alfaro
  • E. Flaccomio
  • S. E. Koposov
  • A. J. Korn
  • A. C. Lanzafame
  • R. Smiljanic
  • A. Bayo
  • G. Carraro
  • A. R. Casey
  • M. T. Costado
  • F. Damiani
  • E. Franciosini
  • U. Heiter
  • A. Hourihane
  • P. Jofré
  • C. Lardo
  • J. Lewis
  • L. Monaco
  • L. Morbidelli
  • G. G. Sacco
  • S. G. Sousa
  • C. C. Worley
  • S. Zaggia
Enheter & grupper
Externa organisationer
  • Heidelberg University
  • University of Montreal, Canada
  • Liverpool John Moores University
  • INAF - Osservatorio Astrofisico di Arcetri
  • Centre for Astrophysics of the University of Porto
  • Harvard–Smithsonian Center for Astrophysics
  • Vilnius University
  • University of New South Wales
  • University of Cambridge
  • CSIC Instituto de Astrofísica de Andalucía (IAA)
  • INAF Palermo Astronomical Observatory
  • Uppsala universitet, Historiska institutionen
  • University of Catania
  • Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
  • University of Valparaíso
  • University of Padova
  • Monash University
  • University of Cádiz
  • Diego Portales University
  • Swiss Federal Institute of Technology
  • Andrés Bello National University
  • INAF Osservatorio Astronomico di Bologna
  • University of Bologna
  • Carnegie Mellon University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
Sidor (från-till)425-438
Antal sidor14
TidskriftMonthly Notices of the Royal Astronomical Society
Volym478
Utgivningsnummer1
StatusPublished - 2018 jul 21
PublikationskategoriForskning
Peer review utfördJa