ELFT HÍRADÓ

[Máté Zoltán <mate AT atomki.mta.hu>]

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.