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X-ORIGINAL-URL:https://www.oa-roma.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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DTSTART:20150329T010000
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DTSTART:20151025T010000
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DTSTART:20160327T010000
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DTSTART:20161030T010000
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DTSTART:20170326T010000
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DTSTART:20171029T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160405T114500
DTEND;TZID=Europe/Rome:20160405T124500
DTSTAMP:20260426T040852
CREATED:20160317T061919Z
LAST-MODIFIED:20160317T061919Z
UID:544-1459856700-1459860300@www.oa-roma.inaf.it
SUMMARY:The final wind: stars in retirement
DESCRIPTION:Catastrophic mass loss is at the heart of 90% of all stellar\ndeath. Low and intermediate mass stars lose their hydrogen envelope\nwhile on the Asymptotic Giant Branch stars. At the end\, there is\ninsufficient hydrogen left and the star rapidly evolves into a white\ndwarf\, briefly illuminating a planetary nebula on the way. The ejected\ngas can be used to study the superwind\, the nuclear burning and dredge\nup processes in the star\, and even (with some difficulties) the star\nformation histories of the dying stellar population. In this talk I\nwill discuss the planetary nebulae of the Galactic bulge\, briefly\nmention AGB stars in globular clusters\, and finally discuss the origin\nof the mysterious AGB J-type stars\, believed to be the cause of the\nA+B grains in the proto-solar system.
URL:https://www.oa-roma.inaf.it/event/the-final-wind-stars-in-retirement/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160405T114500
DTEND;TZID=Europe/Rome:20160405T124500
DTSTAMP:20260426T040852
CREATED:20160317T061919Z
LAST-MODIFIED:20160317T061919Z
UID:4657-1459856700-1459860300@www.oa-roma.inaf.it
SUMMARY:The final wind: stars in retirement
DESCRIPTION:Catastrophic mass loss is at the heart of 90% of all stellar\ndeath. Low and intermediate mass stars lose their hydrogen envelope\nwhile on the Asymptotic Giant Branch stars. At the end\, there is\ninsufficient hydrogen left and the star rapidly evolves into a white\ndwarf\, briefly illuminating a planetary nebula on the way. The ejected\ngas can be used to study the superwind\, the nuclear burning and dredge\nup processes in the star\, and even (with some difficulties) the star\nformation histories of the dying stellar population. In this talk I\nwill discuss the planetary nebulae of the Galactic bulge\, briefly\nmention AGB stars in globular clusters\, and finally discuss the origin\nof the mysterious AGB J-type stars\, believed to be the cause of the\nA+B grains in the proto-solar system.
URL:https://www.oa-roma.inaf.it/event/the-final-wind-stars-in-retirement-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160412T114500
DTEND;TZID=Europe/Rome:20160412T124500
DTSTAMP:20260426T040852
CREATED:20160405T045429Z
LAST-MODIFIED:20160405T045429Z
UID:1046-1460461500-1460465100@www.oa-roma.inaf.it
SUMMARY:Escape of Lyman photons from galaxies
DESCRIPTION:One of the key questions in observational cosmology is the identification of the sources responsible for cosmic\nreionization. The general consensus is that a population of faint low-mass galaxies must be responsible for the\nbulk of the ionizing photons. However\, until recently\, attempts at identifying individual galaxies showing\nLyman continuum (LyC) leakage have only found very few such galaxies\, both at high and low redshifts.\nWe recently proposed a new indirect diagnostic for LyC leakage based on the shape of the Lyman-alpha line\,\nthat I will first review (Verhamme+15).\nA breakthrough was recently achieved by our team (Izotov et al. 2016a\,b)\, detecting LyC emission in\nlow-redshift (z~0.3) luminous compact star-forming galaxies (LCGs) with high LyC escape fractions\nusing HST/COS observations. I will present these new results\, and the Lyman-alpha emission from these galaxies\,\nconfirming our theoretical predictions.\nFinally\, I will propose another complementary Lyman-alpha signature for LyC leakage\, discussing theoretical predictions\non the Lyman-alpha spatial extend of LyC emitters: LyC leakers should have no/faint Lyman-alpha halos.
URL:https://www.oa-roma.inaf.it/event/escape-of-lyman-photons-from-galaxies/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160412T114500
DTEND;TZID=Europe/Rome:20160412T124500
DTSTAMP:20260426T040852
CREATED:20160405T045429Z
LAST-MODIFIED:20160405T045429Z
UID:4663-1460461500-1460465100@www.oa-roma.inaf.it
SUMMARY:Escape of Lyman photons from galaxies
DESCRIPTION:One of the key questions in observational cosmology is the identification of the sources responsible for cosmic\nreionization. The general consensus is that a population of faint low-mass galaxies must be responsible for the\nbulk of the ionizing photons. However\, until recently\, attempts at identifying individual galaxies showing\nLyman continuum (LyC) leakage have only found very few such galaxies\, both at high and low redshifts.\nWe recently proposed a new indirect diagnostic for LyC leakage based on the shape of the Lyman-alpha line\,\nthat I will first review (Verhamme+15).\nA breakthrough was recently achieved by our team (Izotov et al. 2016a\,b)\, detecting LyC emission in\nlow-redshift (z~0.3) luminous compact star-forming galaxies (LCGs) with high LyC escape fractions\nusing HST/COS observations. I will present these new results\, and the Lyman-alpha emission from these galaxies\,\nconfirming our theoretical predictions.\nFinally\, I will propose another complementary Lyman-alpha signature for LyC leakage\, discussing theoretical predictions\non the Lyman-alpha spatial extend of LyC emitters: LyC leakers should have no/faint Lyman-alpha halos.
URL:https://www.oa-roma.inaf.it/event/escape-of-lyman-photons-from-galaxies-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160426T114500
DTEND;TZID=Europe/Rome:20160426T124500
DTSTAMP:20260426T040852
CREATED:20160403T173332Z
LAST-MODIFIED:20160403T173332Z
UID:995-1461671100-1461674700@www.oa-roma.inaf.it
SUMMARY:Machine learning search for gamma-ray burst afterglows in optical images
DESCRIPTION:Thanks to the rapid advances in robotic telescopes and wide field surveys\, the time domain astronomy reveals a huge number of transient detections every night. Therefore\,  automatic classification of sources in the optical images is essential. A special attention is brought to the identification of gamma-ray burst afterglows using the combined observational data from the GROND telescope and the SDSS survey. Their successful identification can lead to further follow-up observations by dedicated telescopes and for statistical studies of these transients.
URL:https://www.oa-roma.inaf.it/event/machine-learning-search-for-gamma-ray-burst-afterglows-in-optical-images/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20160426T114500
DTEND;TZID=Europe/Rome:20160426T124500
DTSTAMP:20260426T040852
CREATED:20160403T173332Z
LAST-MODIFIED:20160403T173332Z
UID:4662-1461671100-1461674700@www.oa-roma.inaf.it
SUMMARY:Machine learning search for gamma-ray burst afterglows in optical images
DESCRIPTION:Thanks to the rapid advances in robotic telescopes and wide field surveys\, the time domain astronomy reveals a huge number of transient detections every night. Therefore\,  automatic classification of sources in the optical images is essential. A special attention is brought to the identification of gamma-ray burst afterglows using the combined observational data from the GROND telescope and the SDSS survey. Their successful identification can lead to further follow-up observations by dedicated telescopes and for statistical studies of these transients.
URL:https://www.oa-roma.inaf.it/event/machine-learning-search-for-gamma-ray-burst-afterglows-in-optical-images-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR