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DTSTART;TZID=Europe/Rome:20160503T114500
DTEND;TZID=Europe/Rome:20160503T124500
DTSTAMP:20260429T070653
CREATED:20160403T173151Z
LAST-MODIFIED:20160403T173151Z
UID:993-1462275900-1462279500@www.oa-roma.inaf.it
SUMMARY:The dawn of star formation: a local perspective
DESCRIPTION:At the end of the Dark Ages gravity began to make matter\ncollapse around over-densities\, resulting in the formation\nof the first stars\, the Pop III. These stars are very important in the\ncosmological context\, the most massive ones contributed ionizing\nphotons that played a role in the reionization of the Universe\nand synthetised the first metals. We know that the formation mode\nof these first stars was different than the one operating today.\nThe lack of metals implies it is difficult to cool a contracting cloud\,\nwhich would argue for a preferential formation of massive or very massive\nstars. However from the theoretical point of view it is not yet possible\nto determine the initial mass function of the first stars. Simulations\nshow that\, even in the absence of metals\, a collapsing cloud may fragment\ninto smaller clouds giving rise to stars that span a range of masses\, even\nsub-solar. Once the first metals begin to be shed in the clouds cooling\nbecomes possible\, either through atomic lines or through dust. It is likely\nthat there is a transition from Pop III to “normal” Pop II star formation\nat some critical metallicity\, however the precise value of this critical\nmetallicity cannot be presently determined theoretically.\nIn this seminar I will describe the observational efforts that our group\nis conducting in the local Universe\, in order to derive as many constraints\nas possible on the nature of the Pop III stars. These include searches\nof the most metal-poor stars\, and their chemical characterization.\nBoth the metallicity distribution function and the chemical pattern\nof the most metal-poor stars contain precious information of the first stars.
URL:https://www.oa-roma.inaf.it/event/the-dawn-of-star-formation-a-local-perspective/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160503T114500
DTEND;TZID=Europe/Rome:20160503T124500
DTSTAMP:20260429T070653
CREATED:20160403T173151Z
LAST-MODIFIED:20160403T173151Z
UID:4661-1462275900-1462279500@www.oa-roma.inaf.it
SUMMARY:The dawn of star formation: a local perspective
DESCRIPTION:At the end of the Dark Ages gravity began to make matter\ncollapse around over-densities\, resulting in the formation\nof the first stars\, the Pop III. These stars are very important in the\ncosmological context\, the most massive ones contributed ionizing\nphotons that played a role in the reionization of the Universe\nand synthetised the first metals. We know that the formation mode\nof these first stars was different than the one operating today.\nThe lack of metals implies it is difficult to cool a contracting cloud\,\nwhich would argue for a preferential formation of massive or very massive\nstars. However from the theoretical point of view it is not yet possible\nto determine the initial mass function of the first stars. Simulations\nshow that\, even in the absence of metals\, a collapsing cloud may fragment\ninto smaller clouds giving rise to stars that span a range of masses\, even\nsub-solar. Once the first metals begin to be shed in the clouds cooling\nbecomes possible\, either through atomic lines or through dust. It is likely\nthat there is a transition from Pop III to “normal” Pop II star formation\nat some critical metallicity\, however the precise value of this critical\nmetallicity cannot be presently determined theoretically.\nIn this seminar I will describe the observational efforts that our group\nis conducting in the local Universe\, in order to derive as many constraints\nas possible on the nature of the Pop III stars. These include searches\nof the most metal-poor stars\, and their chemical characterization.\nBoth the metallicity distribution function and the chemical pattern\nof the most metal-poor stars contain precious information of the first stars.
URL:https://www.oa-roma.inaf.it/event/the-dawn-of-star-formation-a-local-perspective-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
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