EAS Publications Series

Stellar Evolution and Seismic Tools for Asteroseismology - Diffusive Processes in Stars and Seismic Analysis
C.W. Straka, Y. Lebreton and M.J.P.F.G. Monteiro (eds)
EAS Publications Series, 26 (2007) 155-165
DOI: 10.1051/eas:2007134

Microscopic Diffusion in Stellar Evolution Codes: First Comparisons Results of ESTA-Task 3

Y. Lebreton¹, J. Montalbán², J. Christensen-Dalsgaard³, S. Théado², A. Hui-Bon-Hoa⁴, M.J.P.F.G. Monteiro⁵, S. Degl'Innocenti⁶, M. Marconi⁷, P. Morel⁸, P.G. Prada Moroni⁶ and A. Weiss⁹

¹ Observatoire de Paris, GEPI, CNRS UMR 8111, Meudon, France
² Institut d'Astrophysique et de Géophysique, Université de Liège, Belgique
³ Institut for Fysik og Astronomi, Aarhus Universitet, Denmark
⁴ LATT, Observatoire de Midi-Pyrénées, CNRS UMR 5572, Toulouse, France
⁵ Centro de Astrofísica da Universidade do Porto, Portugal and Departamento de Matemática Aplicada, Faculdade de Ciências da Univ ersidade do Porto, Portugal
⁶ Dipartimento di Fisica, Università di Pisa, Italy
⁷ INAF-Osservatorio Astronomico di Capodimonte, Napoli, Italy
⁸ Observatoire de la Côte d'Azur, Cassiopée, CNRS UMR 6202, Nice, France
⁹ Max-Planck-Institut für Astrophysik, Garching, Germany

(Published online: 20 June 2007)

Abstract
We present recent work undertaken by the Evolution and Seismic Tools Activity (ESTA) team of the CoRoT Seismology Working Group. The new ESTA-Task 3 aims at testing, comparing and optimising stellar evolution codes which include microscopic diffusion of the chemical elements resulting from pressure, temperature and concentration gradients. The results already obtained are globally satisfactory, but some differences between the different numerical tools appear that require further investigations.