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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:20180325T010000
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DTSTART:20181028T010000
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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART:20200329T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191105T114500
DTEND;TZID=Europe/Rome:20191105T124500
DTSTAMP:20260405T010554
CREATED:20191016T061058Z
LAST-MODIFIED:20191030T155258Z
UID:6926-1572954300-1572957900@www.oa-roma.inaf.it
SUMMARY:The impact of AGB stars on the life of stellar systems
DESCRIPTION:During the latest phases of their lives\, low-intermediate mass stars (M<8Msun) evolve through the Asymptotic Giant branch (AGB) phase. Although very rapid\, the AGB phase represents a crucial step for the chemical evolution of the system where these stars form. The reason is that AGB stars undergo an advanced nucleosynthesis and experiment dredge-up events\, while they progressively lose the majority of their mass through stellar winds. Furthermore\, the low temperature and high densisty of their stellar winds prove extremely favourable conditions for dust condensation in the circumstellar envelopes. All the reprocessed gas and dust lost by the AGB stars enrich the insterstellar medium of the host system. Detailed modelling of these complex physical processes are essential to reconstruct the impact that these stars had on the history of formation and chemical evolution of stellar clusters and galaxies. In this talk I will present how the latest generation of AGB+dust evolutionary models has been recently used to this scope in different environments: from globular clusters\, to unveil the origine of multiple populations\, to Local Group dwarf galaxies\, to infer star formation history and dust production rate.
URL:https://www.oa-roma.inaf.it/event/colloquium-flavia-dellagli/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191108T114500
DTEND;TZID=Europe/Rome:20191108T124500
DTSTAMP:20260405T010554
CREATED:20191105T085225Z
LAST-MODIFIED:20191105T085225Z
UID:7038-1573213500-1573217100@www.oa-roma.inaf.it
SUMMARY:The ultraluminous X-ray pulsar NGC 5907 ULX-1 and its nebula
DESCRIPTION:Ultraluminous X-ray pulsars are accretion-powered pulsars whose X-ray\nluminosity\, if isotropic\, largely exceeds their Eddington limit. Only a handful\nare known to date and NGC 5907 ULX-1\, distant 17 Mpc from us\, is the most luminous of them\,\nat 1e41 erg/s 500 times its Eddington limit. We constrained through\npulsar timing its orbit and spin behavior\, estimating a 5d orbital period and a spin-up\ntime <40 yr. We detected an extended X-ray feature surrounding the source: likely a young and\npowerful bubble driven by the wind from the accreting pulsar system. The nebula\nhas been powered at ~1e41 erg/s for ~70 kyr proving that a highly super-Eddington\nregime can be sustained for much longer than the spin-up time of the pulsar.\nI will present the current status of the observations and understanding of this system\nand the prospects to solve the still open problems it raises.
URL:https://www.oa-roma.inaf.it/event/the-ultraluminous-x-ray-pulsar-ngc-5907-ulx-1-and-its-nebula/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191114T114500
DTEND;TZID=Europe/Rome:20191114T124500
DTSTAMP:20260405T010554
CREATED:20191023T064535Z
LAST-MODIFIED:20191031T064029Z
UID:7011-1573731900-1573735500@www.oa-roma.inaf.it
SUMMARY:Lithium in the local Volume
DESCRIPTION:We present our recent study on the chemical evolution of lithium in the thin disc of the Milky Way.\nWe found that the best agreement with the observed Li abundances in the thin disc is obtained\nconsidering novae as the main source of lithium. We assumed a delay time of ≈1 Gyr  for nova\nproduction and an effective 7Li yield of 1.8(± 0.6)×10−5 Msun over the whole nova lifetime.\nThe possibility to check our detailed assumptions on lithium production on other stellar systems\, such\nas the satellites of our Milky Way\, is seriously hampered by their distance from us. In these  systems\ndwarf stars (where the original lithium can be measured) are too faint to detect lithium lines.\nHowever\, thanks to the Gaia mission\, it was recently possible to disentangle the stars of a disrupted\ndwarf galaxy in the Galactic halo (called Enceladus or Galactic sausage). Adopting a chemical evolution\nmodel able to match the chemical enrichment in alpha elements and the metallicity distribution function\nof Enceladus\, we present our prediction for the lithium abundance of the stars of this disrupted galaxy.
URL:https://www.oa-roma.inaf.it/event/colloquium-gabriele-cescutti/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191115T160000
DTEND;TZID=Europe/Rome:20191115T170000
DTSTAMP:20260405T010554
CREATED:20191108T072725Z
LAST-MODIFIED:20191108T075652Z
UID:7070-1573833600-1573837200@www.oa-roma.inaf.it
SUMMARY:Dal Sole a Sedna: una passeggiata per il sistema solare\, e uno sguardo più in là
DESCRIPTION:Dal 1959 ad oggi più di cento sonde spaziali hanno lasciato la Terra verso la Luna e lo spazio profondo. Queste appendici robotica dei nostri sensi hanno visitato tutti i pianeti e i principali satelliti del sistema solare\, rivelando una straordinaria e inattesa varietà di forme e fenomeni. Ripercorrere vent’anni di scoperte sarà un tributo all’ingegno di quanti le hanno rese possibili. Grazie alle immagini più belle raccolte negli ultimi anni\, la conferenza ripercorrerà le scoperte più significative nell’esplorazione del sistema solare\, gettando infine uno sguardo ai pianeti delle stelle vicine. Forse tra questi ne esiste qualcuno che ospita la vita? Come trovarlo?
URL:https://www.oa-roma.inaf.it/event/dal-sole-a-sedna-una-passeggiata-per-il-sistema-solare-e-uno-sguardo-piu-in-la/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191118T090000
DTEND;TZID=Europe/Rome:20191122T180000
DTSTAMP:20260405T010554
CREATED:20190111T102035Z
LAST-MODIFIED:20190111T102139Z
UID:5155-1574067600-1574445600@www.oa-roma.inaf.it
SUMMARY:Lithium in the Universe: to Be or not to Be
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/lithium-in-the-universe-to-be-or-not-to-be/
LOCATION:OAR Monte Porzio Catone – aula Gratton\, Via Frascati 33\, Roma\, RM\, 00136\, Italia
CATEGORIES:Congressi
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191125T080000
DTEND;TZID=Europe/Rome:20191128T170000
DTSTAMP:20260405T010554
CREATED:20191122T181336Z
LAST-MODIFIED:20191122T181336Z
UID:7116-1574668800-1574960400@www.oa-roma.inaf.it
SUMMARY:workshop Stamerra
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/workshop-stamerra/
LOCATION:Aula Gratton
CATEGORIES:Congressi
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191126T114500
DTEND;TZID=Europe/Rome:20191126T124500
DTSTAMP:20260405T010554
CREATED:20190919T100822Z
LAST-MODIFIED:20191123T102647Z
UID:6767-1574768700-1574772300@www.oa-roma.inaf.it
SUMMARY:LSST: an opportunity for the Italian Community
DESCRIPTION:We review the current status of the LSST project\, its expected performances\, the key science goals and the involvment of the Italian Community
URL:https://www.oa-roma.inaf.it/event/colloquium-giuliana-fiorentino/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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