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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20100326T000000
DTEND;TZID=Atlantic/Canary:20100326T010000
UID:iactalks-31
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/31
CREATED:2010-03-26T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Primitive materials preserved in meteorites and comets: clues on th
 e stellar sources producing short-lived nuclides and  presolar grains
DESCRIPTION:Primitive materials preserved in meteorites and comets: clues o
 n the stellar sources producing short-lived nuclides and  presolar grains\
 nDr. Josep María Trigo\n\nShort-lived nuclides (SLNs) were incorporated t
 o the solar nebula at the time of condensation of the first minerals from 
 the vapor phase. The study of the isotopic ratios preserved in primitive m
 eteorites provides clues on the stellar sources that produced these SLN, b
 eing supernovae and Asymptotic Giant Branch stars (AGBs) candidates. On th
 e other hand, stellar grains were also preserved in primitive meteorites a
 nd Interplanetary Dust Particles (IDPs). Their survival demonstrates that 
 the solar nebula was not so hot as first researchers proposed in the 60s. 
 Interestingly, the available stellar grain abundances in primitive meteori
 tes (chondrites) depend of the physico-chemical processes suffered by thei
 r parent bodies: metamorphism, aqueous alteration, etc.\nAn evaluation of 
 the primordial  presolar grain abundances in the protoplanetary disk at th
 e time these materials formed would allow a comparison with the derived fr
 om theoretical models. For gaining insight on these processes we should st
 udy the most primitive meteorites (the chondrites), but also even more pri
 stine materials arrived from comets, particularly these captured in the st
 ratosphere as IDPs, or collected from 81P/Wild 2 comet by Stardust (NASA) 
 spacecraft.
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