BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Osservatorio Astronomico di Roma - ECPv6.15.20//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://www.oa-roma.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Rome
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231107T113000
DTEND;TZID=Europe/Rome:20231107T123000
DTSTAMP:20260429T003349
CREATED:20230725T142148Z
LAST-MODIFIED:20231027T055053Z
UID:12052-1699356600-1699360200@www.oa-roma.inaf.it
SUMMARY:colloquium Gregory Sloan: Carbon stars and dust in the Universe
DESCRIPTION:Intermediate-mass stars become carbon-rich in the final phases of their\nlives as stars.  As they die\, carbon stars produce significant\nquantities of carbon-rich dust\, and they dominate the dust production in nearby\nmetal-poor galaxies like the Magellanic Clouds.  Infrared spectroscopy\nof carbon stars in these galaxies and our own reveals that (1) the\ninitial metallicity of a carbon star has little influence on how much\ndust it will produce\, and (2) the transition to strong pulsations in the\natmospheres of these stars leads to high rates of mass loss and dust\nproduction\, which will end the life of the star and eject most of its\nmass back into its host galaxy.  Stellar modeling shows that at lower\nmetallicity\, stars evolve more quickly\, and higher-mass stars can\nbecome carbon stars.  Carbon-rich dust has now been detected in\ngalaxies with redshifts up to 7\, or only 800 million years after the\nBig Bang.  While carbon stars can evolve in this time\, higher-mass\nobjects such as core-collapse supernovae or Wolf-Rayet stars are often\ninvoked as the likely source of that dust.  Nonetheless\, the available\nevidence points to carbon stars as the most likely culprit.
URL:https://www.oa-roma.inaf.it/event/colloquium-greg-sloan/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
END:VCALENDAR