Berlin 2014 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Fathoming Stellar Evolution (Part 2)
MS 7.5: Vortrag
Mittwoch, 19. März 2014, 18:00–18:15, DO24 1.205
Tracing back the Local Bubble’s formation from isotopic anomalies in the deep ocean crust — •Michael Schulreich and Dieter Breitschwerdt — Zentrum für Astronomie und Astrophysik, TU Berlin, Berlin, Germany
Supernova explosions responsible for the creation of the Local Bubble (LB) and its associated HI cavity should have caused geological isotope anomalies via deposition of debris on Earth. The discovery of a highly significant increase of 60Fe (a radionuclide which is exclusively produced in explosive nucleosynthesis) in layers of a deep sea ferromanganese crust, corresponding to a time of 2.2 Myr before present, appears very promising in this context. We report on our latest results in relating these measurements to the formation of the LB by means of 3D hydrodynamical adaptive mesh refinement simulations of the interstellar medium in the solar neighborhood. These calculations are based on a sophisticated selection procedure for the LB’s progenitor stars and take advantage of passive scalars for modeling the turbulent chemical mixing process.