Tag: stelle

Stellar parameters and chemical abundances from GAPS. The study: “The GAPS Programme at TNG XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra” of M. Baratella (UniPd) recently appeared on A&A

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Several astronomical studies rely on the precise determination of the chemical abundances of stars. For instance, the determination of chemical abundances of stars in different sites of the Milky Way, or with different age or evolutionary phase, can provide precious information on the evolution of our Galaxy. However, recently it has been discovered that spectroscopic determination of stellar chemical abundances

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Discovered an X-ray cycle in a 400 million years old star. The study: “An X-ray activity cycle on the young solar-like star ɛ Eridani” of M. Coffaro (Eberhard-Karls Universität Tübingen) appeared on A&A

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The intensity of Solar magnetic activity and of the related phenomena (such as sunspots and flares) varies with an 11-years cycle. In order to understand whether such an activity cycle is common among solar-type stars, since 1966 a project based on the Observatory of Mt. Wilson is collecting measurements of the cromospheric activity of a large sample of low-mass stars

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The chemical evolution of the Milky Way unveiled by GES. The study “The Gaia-ESO Survey: the origin and evolution of s-process elements” of L. Magrini (INAF – OA Arcetri) published in Astronomy & Astrophysics

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The study of the chemical abundances of stars with different age and position in the Milky Way provide crucial information on the formation and evolution of our Galaxy. In particular, heavy elements (i.e. those with the atomic number Z > 30) are produced by the successive capture of neutrons by lighter elements. This occurs by two processes, the slow s-process

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“The Gaia-ESO Survey: lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars ” pubblicato su MNRAS

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E’ stato recentemente pubblicato su Monthly Notices of the Royal Astronomical Society l’articolo “The Gaia-ESO Survey: lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars” di R. D. Jeffries, con vari coautori dell’Osservatorio Astronomico di Palermo. L’articolo nasce dal progetto internazionale “The Gaia-ESO survey“, che vede un forte coinvolgimento dell’Osservatorio Astronomico di Palermo.   Nell’articolo

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