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Il talk presenterà alcune figure femminili che hanno contribuito allo sviluppo della scienza astronomica, dalle origini al XX secolo, sottolineando alcuni aspetti che hanno favorito il loro approccio all’astronomia e alcune caratteristiche tipiche del loro contributo.

Ileana Chinnici (INAF – Osservatorio Astronomico di Palermo)

Abstract.

I will discuss how high spatial, spectral, and temporal resolution chromospheric/transition region/coronal observations coupled with detailed modeling can help us diagnose coronal heating properties in active region cores in non-flaring conditions.  I will focus on recent results from the Interface Region Imaging Spectrograph (IRIS), which provides us with unprecedented high spatial, temporal and spectral resolution observations of the chromosphere and transition region. Joint with coronal observations with Hinode (XRT and EIS), and SDO/AIA, these data cover from the upper photosphere to the corona.

In particular, I will discuss how IRIS observations of footpoints of hot active region loops, coupled with detailed HD and MHD modeling including chromosphere, transition region and corona, provide tight constraints on the coronal heating mechanisms in the core of active regions.

ABSTRACT: Elias 29 is a Class I star of the young star forming site of the Rho Ophiuchi Dark Cloud.In X-rays it shows a prominent fluorescent line at 6.4 keV which origin is still to be clearly understood. The excitation of fluorescence of cold material could be due to hard X-ray photons especially produced during flares or to high energy electrons. I will report on a recent joint and simultaneous XMM + NuSTAR of about 300 ks meant to investigate X-rays from soft to hard band (approx. 0.3-80 keV). In particular, I will discuss the analysis of a bright flare of modest duration (20 ks), the fluorescent emission and its variability and the hard X-ray emission in the NuSTAR band (10-80 keV).