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DTSTART;TZID=Europe/Rome:20170523T114500
DTEND;TZID=Europe/Rome:20170523T124500
DTSTAMP:20260406T223629
CREATED:20170208T081112Z
LAST-MODIFIED:20170208T081112Z
UID:2440-1495539900-1495543500@www.oa-roma.inaf.it
SUMMARY:What process(es) produced  barium in the Early Universe?
DESCRIPTION:In the last years our group has found that many chemical anomalies\nobserved in very metal-poor halo stars in the light elements suggest\nthat the first stellar generations were fast rotators\n(spinstars). Recently\, theoretical computations have found that\nspinstars can also play a role in the chemical enrichment of neutron\ncapture elements providing a early contribution of s-process. By means\nof a stochastic chemical evolution model\, it is possible to identify\nthe spinstars s-process contribution as the missing component\nresponsible for the spread in the ratio between light (Sr) to heavy\n(Ba) neutron capture elements. A specific distribution is predicted\nfor the isotopic ratio of Ba in halo stars and this imprint could be\nthe smoking gun of the role played by spinstars in the spread of\n[Sr/Ba] ratio.  In this context\, regarding the still unknown origin of\nthe complementary r-process component\, I present new constraints on\nthe rate and time scales of r-process events\, based on the recent\ndiscovery of the r-process rich stars in the ultra faint galaxy\nReticulum 2.
URL:https://www.oa-roma.inaf.it/event/talk-by-gabriele-cescutti/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170523T114500
DTEND;TZID=Europe/Rome:20170523T124500
DTSTAMP:20260406T223629
CREATED:20170208T081112Z
LAST-MODIFIED:20170208T081112Z
UID:4706-1495539900-1495543500@www.oa-roma.inaf.it
SUMMARY:What process(es) produced  barium in the Early Universe?
DESCRIPTION:In the last years our group has found that many chemical anomalies\nobserved in very metal-poor halo stars in the light elements suggest\nthat the first stellar generations were fast rotators\n(spinstars). Recently\, theoretical computations have found that\nspinstars can also play a role in the chemical enrichment of neutron\ncapture elements providing a early contribution of s-process. By means\nof a stochastic chemical evolution model\, it is possible to identify\nthe spinstars s-process contribution as the missing component\nresponsible for the spread in the ratio between light (Sr) to heavy\n(Ba) neutron capture elements. A specific distribution is predicted\nfor the isotopic ratio of Ba in halo stars and this imprint could be\nthe smoking gun of the role played by spinstars in the spread of\n[Sr/Ba] ratio.  In this context\, regarding the still unknown origin of\nthe complementary r-process component\, I present new constraints on\nthe rate and time scales of r-process events\, based on the recent\ndiscovery of the r-process rich stars in the ultra faint galaxy\nReticulum 2.
URL:https://www.oa-roma.inaf.it/event/talk-by-gabriele-cescutti-2/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
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