Notte Europea dei Ricercatori 2023
In occasione della Notte Europea dei Ricercatori 2022, lโINAF-Osservatorio Astrofisico di Catania ha organizzato varie attivitร per il pubblico che si svolgeranno tra il 28 e il 30 settembre.
Pagina di caricamento
Eventi & Seminari
Calendario di Eventi
L Lun
M Mar
M Mer
G Gio
V Ven
S Sab
D Dom
2 eventi,
Il mese della Ciminiera Scientifica
Dal 13 maggio al 12 giugno, Citta della Scienza illuminerร di scienza la cittร con proiezione olografiche nella grande vetrina su Viale Libertร e Videomapping della Ciminiera. Sarร un mese ricco di seminari scientifici aperti alla cittadinanza, visite guidate del museo, laboratori per i piรน piccoli e meno piccoli e molto altro.
3 eventi,
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Nati sotto il segno di Dike, cresciuti con quello della Bilancia – La storia della Space Law, tra gravitร e giurisprudenza
Nati sotto il segno di Dike, cresciuti con quello della Bilancia – La storia della Space Law, tra gravitร e giurisprudenza
In questo seminario pongo l'attenzione su quei particolari momenti in cui la scienza giuridica ha felicemente intersecato lโosservazione pre-scientifica della natura e, in seguito, le scienze fisiche propriamente dette, traendo da esse, specie nel passato, quando ispirazione, quando una maggiore forza argomentativa.
Si tratta di incroci che sembrano denunciare in modo chiaro unโorigine comune dello sguardo del fisico e del giurista - unโorigine di sicuro meritevole di uno studio storico e filosofico piรน attento che giร sto conducendo โ e che la presente ricerca evidenzia solo per la parte avente a che fare con la descrizione di come la nostra specie si รจ progressivamente impossessata dello spazio esplorabile: un concetto usato in una fase iniziale esclusivamente per indicare territori sulla terraferma e che, al progressivo crescere delle acquisizioni scientifiche, tecnologiche e di una parallela evoluzione giuridica, ha subito diverse modifiche che gli hanno fatto guadagnare pure il significato di distese marine, di spazi aerei al di sopra delle nazioni e, in tempi piรน recenti, quello di spazio esterno alla nostra atmosfera. Uno spazio oramai teatro di dispute di diritto internazionale e scenario di possibili scontri bellici del futuro.
3 eventi,
INAF a Etna Comics 2023
Dal 1 al 4 giugno 2023 si svolge presso il centro fieristico โLe Ciminiereโ di Catania lโundicesima edizione di Etna Comics, Festival Internazionale del fumetto, del gioco e della cultura POP.
3 eventi,
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Diagnostics of the solar corona expansion through Metis coronagraph observations
Diagnostics of the solar corona expansion through Metis coronagraph observations
The solar corona has been investigated in the last decades through observations coming from several spacecraft. The Metis coronagraph, aboard the ongoing Solar Orbiter mission, extends the UVCS/SOHO spectrocoronagraph observations of the scattered ultraviolet emission of the coronal plasma performed during solar activity cycle 23, by simultaneously imaging the coronal visible light polarised brightness (VL pB), in the spectral bandpass 580-640 nm, and the coronal ultraviolet H I Lyฮฑ emission, in the spectral window 121.6 ยฑ 10 nm. Here some specific observations are shown, such as those taken on May 15, 2020, from which important results about the solar wind outflow velocity were inferred by applying the Doppler dimming technique. Other results on the coronal solar wind velocity are presented, obtained by considering the data acquired during the first quadrature of the Solar Orbiter and the Parker Solar Probe (PSP) spacecraft with respect to the Sun. In particular, the same parcel of plasma on the East limb was remotely observed with Metis between 3.5 Rโ and 6.3 Rโ on January 17, 2021, during low-cadence synoptic mode observations, and was sampled in situ by PSP at about 22 Rโ on January 18, 2021. In this case, information about several coronal parameters were inferred with unprecedented details, thanks to the high quality of Metis and PSP data. Finally, other results concerning the first coronal mass ejection observed with Metis on January 16-17, 2021 are reported. In this case, also considering data coming from instruments onboard Solar Orbiter and other spacecraft, a 3D reconstruction and detailed physical information about this structure were obtained. Therefore, Metis, even when operates in synoptic mode and in synergistic coupling with other instruments, allows to get novel and detailed information about the structure of the solar corona with an accuracy never reached until now.
3 eventi,
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Gravitational entropy proposals adaptable to structure formation in Cosmology
Gravitational entropy proposals adaptable to structure formation in Cosmology
I would like to summarize and present cosmological applications of two proposals of Gravitational entropy, which are distinct from the standard holographic approach and from the entropy of the sources. One is the proposal by Clifton-Ellis and Tabakol (CET) based on the Bel-Robinson tensor, the other by Hosoya and Buchert (HB), based on the Leibler-Kullbach functional of Information Theory. By applying these proposals to inhomogenous dust solutions of Einsteinโs equations (LTB and Szekeres models), we have shown in various published articles that both proposals are equivalent in their predictions, but CET is local and HB is non-local. Both yield entropy production in spacetime regions that can be characterized by generation and growth of structure (either overdensities or voids). The CET proposal provides an interesting interpretation of the cosmological constant as an asymptotic gravitational temperature that characterizes a finite entropy saturation value.
2 eventi,
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Determination of fundamental stellar parameters on massive stars
Determination of fundamental stellar parameters on massive stars
Massive stars (i.e. the progenitors of core-collapse supernovae) are quite scarce, but play a crucial role in several important astrophysical phenomena, as for example, the chemical evolution of their host galaxies. Even so, their fundamental stellar parameters (as mass, radii, temperature and luminosity) are poorly known. This relates to important uncertainties about their formation processes, structure and evolution. We are attempting to face this challenge at the research group GEMAE (Grupo de investigaciรณn en Estrellas Masivas y Agrupaciones Estelares) at the University of La Plata, together with collaborators in Chile and Spain. We rely mainly on high-quality and high-resolution spectroscopic data collected by 18 years by the OWN Survey of the O-type and WN-stars in the Southern hemisphere. In this talk I will outline the work that we are developing at GEMAE, focusing on determinations of masses of close binary stars by spectroscopy and photometry in the optic and near-infrared bands.