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

Bertelli Motta, C, Pasquali, A, Richer, J, Michaud, G, Salaris, M, Bragaglia, A, Magrini, L, Randich, S, Grebel, EK, Adibekyan, V, Blanco-Cuaresma, S, Drazdauskas, A, Fu, X, Martell, S, Tautvaišiene, G, Gilmore, G, Alfaro, EJ, Bensby, T, Flaccomio, E, Koposov, SE , Korn, AJ, Lanzafame, AC, Smiljanic, R, Bayo, A, Carraro, G, Casey, AR, Costado, MT, Damiani, F, Franciosini, E, Heiter, U, Hourihane, A, Jofré, P, Lardo, C, Lewis, J, Monaco, L, Morbidelli, L, Sacco, GG, Sousa, SG, Worley, CC and Zaggia, S (2018) The Gaia-ESO Survey: Evidence of atomic diffusion in M67? Monthly Notices of the Royal Astronomical Society, 478 (1). pp. 425-438. ISSN 0035-8711

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Open Access URL: https://arxiv.org/pdf/1804.06293.pdf (Accepted version)

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. © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record 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 Tautvaišienė, G Gilmore, E J Alfaro, T Bensby, 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; The Gaia-ESO Survey: evidence of atomic diffusion in M67?, Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 1, 21 July 2018, Pages 425–438, is available online at: http://dx.doi.org/10.1093/mnras/sty1011
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 06 Jul 2018 11:15
Last Modified: 06 Jul 2018 11:16
DOI or Identification number: 10.1093/mnras/sty1011
URI: http://researchonline.ljmu.ac.uk/id/eprint/8924

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