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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191001T114500
DTEND;TZID=Europe/Rome:20191001T124500
DTSTAMP:20260429T134350
CREATED:20190612T065612Z
LAST-MODIFIED:20190612T065612Z
UID:6287-1569930300-1569933900@www.oa-roma.inaf.it
SUMMARY:colloquium - Chris Sneden
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-chris-sneden/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191003T114500
DTEND;TZID=Europe/Rome:20191003T124500
DTSTAMP:20260429T134350
CREATED:20190902T141633Z
LAST-MODIFIED:20190926T090644Z
UID:6683-1570103100-1570106700@www.oa-roma.inaf.it
SUMMARY:Early galaxy formation and its large-scale effects
DESCRIPTION:Galaxy formation in the first billion years mark a time of great upheaval in the history of the Universe: as the first sources of light\, these galaxies ended the ‘cosmic dark ages’ and produced the first photons that could break apart the hydrogen atoms suffusing all of space starting the process of cosmic reionization. As the earliest building blocks\, the galaxies that formed in the first billion years also determine the physical properties of all subsequent galaxy populations. I will start by introducing the reionization process and detail the reasons foe which the history and topology of reionization remain debated. I will then show how cross-correlations of 21cm data with the underlying galaxy population\, in the forthcoming era of 21cm cosmology\, will yield tantalising constraints on the average intergalactic medium ionization state as well as the reionization toplogy (outside-in versus inside-out). Time permitting\, I will try to give a flavour of how the assembly of early galaxies\, accessible with the forthcoming James Webb Space Telescope\, can provide a powerful testbed for Dark Matter models beyond “Cold Dark Matter”.
URL:https://www.oa-roma.inaf.it/event/colloquium-pratika-dayal/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191010T114500
DTEND;TZID=Europe/Rome:20191010T124500
DTSTAMP:20260429T134350
CREATED:20191004T065258Z
LAST-MODIFIED:20191004T065258Z
UID:6873-1570707900-1570711500@www.oa-roma.inaf.it
SUMMARY:Dynamic relations in sampled processes
DESCRIPTION:I will start my talk by a short description of a historical connection between my university\, Shanghai Jiao Tong University (SJTU)\, and Collegio Romano. There is an interesting chain from Clavius\, who led the Gregorian calendar reform\, via Matteo Ricci and Xu Guangqi\, the first modern scientist of China\, to the founding of the two elite universities on Shanghai\, Fudan and SJTU. The technical part of my talk is based on joint work with Tryphon Georgiou. Linear dynamical relations that may exist in continuous-time\, or at some natural sampling rate\, are not directly discernable at reduced observational sampling rates. Indeed\, at reduced rates\, matrix-valued spectral densities of vector-valued time series have maximal rank and thereby cannot be used to ascertain potential dynamic relations between their entries. This hitherto undeclared source of inaccuracies appears to plague off-the-shelf identification techniques seeking remedy in hypothetical observational noise. In this paper we explain the exact relation between stochastic models at different sampling rates and show how to construct stochastic models at the finest time scale that data allows. We then point out that the correct number of dynamical dependences can only be ascertained by considering stochastic models at this finest time scale\, which in general is faster than the observational sampling rate.
URL:https://www.oa-roma.inaf.it/event/dynamic-relations-in-sampled-processes/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191015T114500
DTEND;TZID=Europe/Rome:20191015T134500
DTSTAMP:20260429T134350
CREATED:20190913T082524Z
LAST-MODIFIED:20191008T061431Z
UID:6725-1571139900-1571147100@www.oa-roma.inaf.it
SUMMARY:Horizontal Branch morphologies in the age of multi-band photometry
DESCRIPTION:The Horizontal Branch (HB) stars have always played a crucial role in the study of the galactic globular clusters (GC). They are the direct offspring of the low mass\, Red Giant Branch (RGB) stars and the final product of the helium flash taking place at the Tip of the RGB. The colour and the luminosity of a HB star are tied to its mass which\, in turn\, is tied to the mass of the star undergoing the flash. The sensitivity of this value to the chemistry of the cluster allows for a large variety of HB morphologies which is one of the culprits that led to the discovery of the multiple populations phenomenon. A leap forward in our understanding of GCs has been made when recent works\, based on a large collection of HST data\, measured\, albeit indirectly\, the helium abundance in a large collection of GCs\, allowing the characterization of these old stellar populations in unprecedented ways. In spite of this richness of information\, however\, we still lack the key to fully understand the populations hosted along the HB\, especially due to the complex interplay between the parameters regulating their evolution. In this talk\, I will provide a review of the current state of the HB study and discuss how the synergy with the recent advancements in the field of multi-band photometry can provide solutions to some new and decades-old problems.
URL:https://www.oa-roma.inaf.it/event/colloquium-marco-tailo/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191022T114500
DTEND;TZID=Europe/Rome:20191022T124500
DTSTAMP:20260429T134350
CREATED:20191007T104849Z
LAST-MODIFIED:20191008T082548Z
UID:6886-1571744700-1571748300@www.oa-roma.inaf.it
SUMMARY:Linear spectropolarimetry in stars different than the Sun: what can we learn?
DESCRIPTION:Polarimetry is considered as an important searching tool in Astronomy and it deserves to be a standard observational technique for a variety of astrophysical contexts: from stellar photospheric inhomogeneities to protoplanetary nebulae\, as well as in the exoplanet research field. Despite this\, however\, the difficulties involved in the measurements and in the theoretical interpretation made this technique not as widespread as it deserves. In this talk I will review the results of my research about the diagnostic potential of optical high resolution linear spectropolarimetry in stars different than the Sun.  At this purpose\, after an introduction on the observational technique\, I will focus on the polarised spectrum of the post-AGB binary system 89 Herculis: from the very inner regions of the stellar envelope to the first observational evidence of a micro-Gauss level magnetic field. Finally\, I will discuss on the applicability and future prospect of this technique in the more general context of stellar physics.
URL:https://www.oa-roma.inaf.it/event/colloquium-manuele-ganci/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191029T114500
DTEND;TZID=Europe/Rome:20191029T124500
DTSTAMP:20260429T134350
CREATED:20191020T043613Z
LAST-MODIFIED:20191020T043613Z
UID:6990-1572349500-1572353100@www.oa-roma.inaf.it
SUMMARY:Post-AGB stars as tracers of the origin of elements in the Universe
DESCRIPTION:The chemical evolution of galaxies is governed by the chemical yields from stars\, especially from Asymptotic Giant Branch (AGB) stars. This underlines the importance of understanding how AGB stars produce their elements by obtaining accurate stellar nucleosynthetic yields. Although AGB nucleosynthesis has general validity\, critical uncertainties (such as the treatment of convective-driven mixing processes and mass loss) exist in current stellar models. Observations from Post-Asymptotic Giant Branch (post-AGB) stars serve as excellent tools to confront predictions from a dedicated suite of stellar models\, quantify the strongest discrepancies\, and eliminate crucial uncertainties that hamper stellar modelling. Our recent studies of post-AGB stars have shown an intriguing chemical diversity that ranges from stars that are extremely enriched in carbon and s-process elements to the discovery of the first post-AGB star with no traces of carbon nor s-process elements. Additionally\, our studies have also shown that AGB nucleosynthesis is significantly affected by a binary companion. These results reflect the complexity that surrounds the element production in AGB stars. In this talk\, I will present the intriguing chemical diversity observed in post-AGB stars and its implications on element/isotope production in AGB stars and stellar nucleosynthetic yields.
URL:https://www.oa-roma.inaf.it/event/post-agb-stars-as-tracers-of-the-origin-of-elements-in-the-universe/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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