Some main sequence stars shows an excess of emission in far infrared with respect to photospheric values. This emission is thought to be thermal emission of dust grains and solid bodies associated with a debris disk orbiting around stars. This hypothesis has been confirmed when some of these disks, such as the one orbiting the star Fomalhaut, have been directly» Read more
Palermo Astronomical Observatory “Giuseppe S. Vaiana” is one of the research centres of the National Institute for Astrophysics (INAF). It works together with Palermo University through the Department of Physics and Chemistry.
OAPa’s main characteristic is its specific vocation in the field of space astrophysics. The network of activities also involves several frontier research fields both at the national and international level.
Diffuse X-ray emission in massive star formin region. Published on ApJS “Diffuse X-ray emission in the Cygnus OB2 association” of J. F. Albacete-Colombo (Universidad de Rıo Negro)
During their short existence lasting only few million years, massive stars (more massive than 8 solar masses with spectral type O and B-early) strongly affect the surrounding environment thanks to their intense UV radiation and stellar winds. A single O star, in fact, can loose about 10-6 solar masses of gas in a wind reaching velocities of 1600–2500 km s−1 (Stevens & Hartwell, 2003).» Read more
The Gaia-ESO Survey and the stellar chemical evolution. Published on MNRAS the study: “The Gaia-ESO Survey: evidence of atomic diffusion in M67?” of C. Bertelli Motta (ZAH)
It has been suggested that stars formed from the same molecular cloud should share the same primordial chemical abundances. This has led several authors to consider the possibility that stars formed in a star forming region now disappeared could be identified by studying their chemical composition (chemical tagging theory, Freeman & Bland-Hawthorn 2002). However, the evolution of chemical abundances of» Read more
Selezione pubblica per titoli, eventualmente integrata da un colloquio, per il conferimento di n. 1 assegno di ricerca, tipologia “post-doc”, della durata di un anno,» Read more
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