BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT DTSTART;TZID=Atlantic/Canary:20230131T123000 DTEND;TZID=Atlantic/Canary:20230131T133000 UID:iactalks-1638 X-WR-CALNAME: IAC Talks: Open Astronomy Seminars X-ORIGINAL-URL: /iactalks/Talks/view/1638 CREATED:2023-01-31T12:30:00+00:00 X-WR-CALDESC: IAC Talks upcomming talks SUMMARY:Is the riddle of the astronomical Li origin solved? DESCRIPTION:Is the riddle of the astronomical Li origin solved?\nDr. Paolo Molaro\n\nLithium is a key   element which plays an important role in   astronomy  as well as everyday human life.  Nevertheless it is probably the only element whose astronomical origin is still a myste ry.  A fraction of  about 30% of what is measured today was  ; made in the first 3 minutes of the Universe and about 10% is  made& nbsp; by spallation  reactions of  cosmic rays with the atoms in the interstellar medium. However, as stars burn  Li in their ho t interiors and what makes the remaining ~60%  is still unknown.  ; The recent detections of   7Li and 7Be in the outburst of   cl assical novae is a landmark in the solution of this long standing mystery. The discovery   confirms a theoretical speculation  made about 50 years ago    but  which was never  supported by obs ervations.   Since then  the  presence of Be-7 has been con firmed to be ubiquitous in about a dozen classical novae and very recently also in the  recurrent nova RS Oph that blew out in August 2021.&nbs p; However, the observed values show  tension with theory  being one order of magnitude greater than predictions.  Detailed Li G alactic chemical evolution models   assuming the "observed" yields  show that indeed  Novae could  be the long sought& nbsp; source for the Galactic  7Li.  END:VEVENT END:VCALENDAR