Az MTA Atommagkutató Intézet előadótermében
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2015. január 13-án, KEDDEN 11:00-kor
Maria Lugaro (Lendület Project Leader, Konkoly Observatory, Budapest Monash Centre for Astrophysics, Melbourne)
Dating the prehistory of the solar system with meteoritic analysis, stellar models, and nuclear physics címmel előadást tart.
Az előadás előtt 10:30-tól tea, vendégeket szívesen látunk.
Máté Zoltán Kivonat: We have exploited radioactivity as a clock for measuring cosmic times. In particular, we have used the abundances of radioactive nuclei heavier than iron with long half lives (10-20 million years) to investigate the circumstances of the birth of the Sun. By comparing their abundances in the early solar system, inferred by meteoritic analysis, to those predicted by our stellar models, with updated nuclear physics inputs, we have dated the last "rapid" and "slow" neutron-capture events that contaminated the solar system material at roughly 100 and 30 Myr, respectively, before the formation of the Sun. The latter provides us with an upper limit of the time when the precursor material of the solar system became isolated from the bulk of the galactic material. Interestingly, it compares well to the lifetime of high-mass molecular clouds suggesting that the Sun was born in a very large family of stars.