Category: Ricerca

Struttura ed evoluzione degli ammassi nell’associazione Vela OB2. Pubblicato su A&A: “The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure” di E. Franciosini (INAF-Arcetri)

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of Mario Giuseppe Guarcello    ( follow mguarce)   We are living a golden age for the research on stellar clusters and their structure, formation and evolution. This thanks to the satellite Gaia of the European Space Agency, which will provide position and radial velocity of over one billion stars with unprecedented precision, and the project Gaia-ESO Survey, an ambitious spectroscopic

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Activity and rotation in M type stars. The study “HADES RV programme with HARPS-N at TNG. VII. Rotation and activity of M-dwarfs from time-series high-resolution spectroscopy of chromospheric indicators” of A. Suárez Mascareño (Instituto de Astrofísica de Canarias) published on Astronomy & Astrophysics

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of Mario Giuseppe Guarcello    ( follow mguarce)   We know that the intensity of the magnetic activity in the Sun (e.g.: the family of magnetic phenomena including spots, faculae, flares, etc…) varies with an 11-years cycle. Do all the stars have such a magnetic cycle? If yes, how does it change with stellar properties (mainly mass, rotation and evolutionary phase)?

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Looking for compatc objects in the Kepler supernova remnant. Published on ApJ the study: “No Surviving Companion in Kepler’s Supernova” of P. Ruiz-Lapuente (Instituto de Física Fundamental, Madrid)

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di Mario Giuseppe Guarcello    ( follow mguarce)   Type Ia supernovae are particularly important in cosmology since they allow us precise measurements of the hosting galaxies. These supernovae are not triggered by the collapse of the core of massive stars, such as the “core-collapse supernovae”. They are instead due to the thermonuclear explosion of a white dwarf in close binary

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Searching low-mass stars in OB associations. Published on A&A the study: “The low-mass pre-main sequence population of Scorpius OB1” of F. Damiani (INAF-OAPA)

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OB associations are groups of massive stars (with spectral type O and B, more massive than 3.5 solar masses) which typically cover wide regions in the sky. The presence of such a rich population of massive stars suggests the presence of even a larger population of low-mass stars. There exists, in fact, a relation between the number of stars in

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A peculiar supernova remnant. Published on A&A the study: “Discovery of a jet-like structure with overionized plasma in the SNR IC 443” of E. Greco (OAPA/UNIPA)

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Supernova remnants, i.e. the remnant of supernovae explosions, are among the most interesting astronomical objects. In fact, they are not only produced by one of the most violent phenomenon occurring in the Universe (the explosion of a supernova from the collapse of the core of a massive star, i.e. a “core-collapse supernova”, which emits the same energy of 1033 atomic

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Jet nelle stelle giovani. Pubblicato su A&A lo studio “Structure of X-ray emitting jets close to the launching site: from embedded to disk-bearing sources” di S. Ustamujic (Universidad Complutense de Madrid)

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di Mario Giuseppe Guarcello    ( segui mguarce)     Le stelle giovani, dette di pre-sequenza principale perchè ancora in fase di contrazione gravitazionale e con un nucleo troppo freddo e poco denso per poter produrre energia tramite le reazioni termonucleari che invece avvengono nelle stelle di sequenza principale, sono oggetti caraterizzati da fenomeni interessanti. Ad esempio, alcune di esse presentano

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Mass determination of the three planets of K2-3. Published on A&A the study: “Eyes on K2-3: A system of three likely sub-Neptunes characterized with HARPS-N and HARPS” of M. Damasso (INAF-OA Torino)

Ricerca

In the field of exoplanetary science, it is particularly important the study of exoplanets orbiting in the habitable zone, e. g. at a distance from their stars which allows water to be in liquid state at the surface of rocky planets. In particular, several projects such as MEarth (Irwin et al. 2015), APACHE (Sozzetti et al. 2013), and TRAPPIST (Gillon

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Modelli magnetoidrodinamici di interazione tra resti di supernovae e nubi. Pubblicato su MNRAS “Post-adiabatic supernova remnants in an interstellar magnetic field: oblique shocks and non-uniform environment” di O. Petruk (Institute for Applied Problems in Mechanics and Mathematics – Ucraina)

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di Mario Giuseppe Guarcello    ( segui mguarce)     I resti di supernova, ossia uno dei due prodotti di un’esplosione di supernova assieme all’oggetto compatto formato dal nucleo della stella esplosa, sono ritenuti i principali responsabili della produzione di raggi cosmici, che vengono accelerati fino ad energie di 3×1015 eV. L’accelerazione di raggi cosmici caratterizza tutta l’evoluzione dei resti di supernova,

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The Gaia-ESO survey and the evolution of stellar clusters. Published on A&A “The Gaia-ESO Survey: kinematical and dynamical study of four young open clusters” of L. Bravi (INAF-OA Arcetri)

Ricerca

Despite the stars in our Galaxy typically formed in stellar clusters, only a small fraction of them today is observed associated with a cluster. This led to the conclusion that stellar clusters typically disperse in 10-100 million years. Two mechanisms are thought to be responsible for the dispersion of stellar clusters. According to the model of the “residual gas expulsion”,

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Il sito NASA/Chandra riporta lo studio OAPA/CfA sulla Nebulosa dell’Aquila e NGC6611

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di Mario Giuseppe Guarcello    ( segui mguarce)     È stato pubblicato sul sito del satellite Chandra della NASA un articolo (link) interamente dedicato agli studi INAF-OAPA/CfA della regione di formazione stellare nota come Nebulosa dell’Aquila o M16, contenente l’ammasso stellare NGC 6611, realizzato con vari telescopi operativi in diverse bande dello spettro elettromagnetico, tra cui il satellite Chandra della

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