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

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 abun...

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Detalles Bibliográficos
Autores: Bertelli Motta, C., Pasquali, A., Richer, J., Michaud, G., Salaris, M., Bragaglia, A., Magrini, L., Randich, S., Grebel, E.K., Adibekyan, V., Blanco-Cuaresma, S., Drazdauskas, A., Fu, X., Martell, S., Tautvaišiene, G., Gilmore, Gerry, Alfaro, Emilio J., Bensby, T., Flaccomio, E., Koposov, Sergey E., Korn, A.J., Lanzafame, A.C., Smiljanic, R., Bayo, A., Carraro, G., Casey, A. R., Costado, M. T., Damiani, F., Franciosini, E., Heiter, Ulrike, Hourihane, A., Jofré, P., Lardo, C., Lewis, J., Monaco, L., Morbidelli, L., Sacco, G. G., Sousa, S.G., Worley, C.C., Zaggia, S.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/208990
Acceso en línea:http://hdl.handle.net/10261/208990
Access Level:acceso abierto
Palabra clave:Galaxy: abundances
Galaxy: evolution
Stars: abundances
Stars: evolution
Descripción
Sumario: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.

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