Ara es mostren els items 1-12 de 349

    • The unusual planetary nebula nucleus in the Galactic open cluster M37 and six further hot white dwarf candidates 

      Werner, Klaus; Reindl, Nicole; Raddi, Roberto; Griggio, Massimo; Bedin, Luigi; Camisassa, María Eugenia; Rebassa Mansergas, Alberto; Torres Gil, Santiago; Goodhew, Peter (EDP Sciences, 2023-10-01)
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      Accés obert
      Planetary nebulae in Galactic open star clusters are rare objects; only three are known to date. They are of particular interest because their distance can be determined with high accuracy, allowing one to characterize the ...
    • NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts 

      Bostanci, Funda; Boztepe, Tugba; Güver, Tolga; Strohmayer, Tod E.; Cavecchi, Yuri; Gögüs, Ersin; Altamirano, Diego; Bult, Peter; Chakrabarty, Deepto; Guillot, Sebastien; Jaisawal, Gaurava K.; Malacaria, Christian; Mancuso, Giulio C.; Sanna, Andrea; Swank, Jean H. (Institute of Physics (IOP), 2023-11-13)
      Article
      Accés obert
      We present temporal and time-resolved spectral analyses of all the thermonuclear X-ray bursts observed from the neutron star low-mass X-ray binary 4U 1728-34 with NICER from 2017 June to 2019 September. In total, we detected ...
    • Main-sequence companions to white dwarfs - II. The age-activity-rotation relation from a sample of Gaia common proper motion pairs 

      Rebassa Mansergas, Alberto; Maldonado, Jesús; Raddi, Roberto; Torres Gil, Santiago; Hoskin, Matthew; Cunningham, Tim; Hollands, Mark; Ren, Juanjuan; Gänsicke, Boris T.; Tremblay, P. E.; Camisassa, María Eugenia (Oxford University Press, 2023-10-06)
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      Accés obert
      Magnetic activity and rotation are related to the age of low-mass main-sequence stars. To further constrain these relations, we study a sample of 574 main-sequence stars members of common proper motion pairs with white ...
    • First measurement of the low-energy direct capture in Ne 20 (p,¿) Na 21 and improved energy and strength of the Ec.m.=368 keV resonance 

      Masha, Eliana; Barbieri, Lucia; Skowronski, Jakub; Aliotta, Marialuisa; Ananna, Chemseddine; Barile, Francesco; Bemmerer, Daniel; Best, Andreas; Boeltzig, Axel; Broggini, Carlo; Bruno, Carlo; Caciolli, Antonio; José Pont, Jordi (American Physical Society, 2023-11-22)
      Article
      Accés restringit per política de l'editorial
      The 20Ne(p,¿)21Na reaction is the slowest in the NeNa cycle and directly affects the abundances of the Ne and Na isotopes in a variety of astrophysical sites. Here we report the measurement of its direct capture contribution, ...
    • Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26 

      Canete, Laetitia; Doherty, Daniel; Lotay, Gavin; Seweryniak, Dariusz; Campbell, Chris; Carpenter, Michael Patten; Catford, Wilton; Chipps, Kelly A.; Henderson, Jack; Izzard, Robert; Janssens, Robert; Jayatissa, Heshani; José Pont, Jordi (American Physical Society, 2023-09-14)
      Article
      Accés obert
      The 25Al(p,¿) reaction has long been highlighted as a possible means to bypass the production of 26Al cosmic ¿ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in 26Si have ...
    • Nuclear physics midterm plan at LNS 

      Agodi, Clementina; Cappuzzello, Francesco; Cardella, Giuseppe; Cirrone, Pablo; De Filippo, Enrico; di Pietro, Alessia; Gargano, Angela; la Cognata, Marco; Mascali, David; Milluzzo, Giuliana; Nania, Rosario; José Pont, Jordi (Springer, 2023-11-24)
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      Accés obert
      The next years will see the completion of several new facilities at Istituto Nazionale di Fisica Nucleare – Laboratori Nazionali del Sud (LNS) opening up new possibilities in the fields of nuclear structure, nuclear dynamics, ...
    • Sub-second infrared variability from the archetypal accreting neutron star 4U 1728-34 

      Vincentelli, Federico; Casella, Piergiorgio; Borghese, Alice; Cavecchi, Yuri; Mastroserio, Guglielmo; Stella, Luigi; Altamirano, Diego; Armas Padilla, Montserrat; Baglio, Maria Cristina; Belloni, Fabio; Casares, Jorge; Cúneo, Virginia; Degenaar, Nathalie (Oxford University Press, 2023-10-25)
      Article
      Accés obert
      We report on the first simultaneous high-time resolution X-ray and infrared (IR) observations of a neutron star low mass X-ray binary in its hard state. We performed ¿h of simultaneous observations of 4U 1728-34 using ...
    • General relativistic pulsations of ultra-massive ZZ Ceti stars 

      Córsico, Alejandro H.; Boston, Reece; Althaus, Leandro G.; Kilic, Mukremin; Kepler, Souza Oliveira; Camisassa, María Eugenia; Torres Gil, Santiago (Oxford University Press, 2023-10-01)
      Article
      Accés obert
      Ultra-massive white dwarf stars are currently being discovered at a considerable rate, thanks to surveys such as the Gaia space mission. These dense and compact stellar remnants likely play a major role in Type Ia supernova ...
    • The orbital period of the recurrent nova V2487 Oph revealed 

      Rodríguez Gil, Pablo; Corral Santana, Jesus M.; Elias Rosa, Nancy; Gänsicke, Boris T.; Hernanz, Margarita; Sala Cladellas, Glòria (Oxford University Press, 2023-10-12)
      Article
      Accés obert
      We present the first reliable determination of the orbital period of the recurrent nova V2487 Oph (Nova Oph 1998). We derived a value of 0.753 ± 0.016 d (18.1 ± 0.4 h) from the radial velocity curve of the intense He¿II ...
    • Search for 22Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes 

      Fougères, Chloé; de Oliveira Santos, François; José Pont, Jordi; Michelagnoli, Caterina; Clément, Emmanuel; Kim, Yung Hee; Lemasson, Antoine; Guimarães, Valdir; Barrientos, Diego; Bemmerer, Daniel; Benzoni, Giovanna; Boston, Andrew J. (2023-09-22)
      Article
      Accés obert
      Classical novae are thermonuclear explosions in stellar binary systems, and important sources of 26Al and 22Na. While ¿ rays from the decay of the former radioisotope have been observed throughout the Galaxy, 22Na remains ...
    • Mass-loss and composition of wind ejecta in type I X-ray bursts 

      Herrera, Yago; Sala Cladellas, Glòria; José Pont, Jordi (EDP Sciences, 2023-10-17)
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      Accés obert
      Context. X-Ray bursts (XRBs) are powerful thermonuclear events on the surface of accreting neutron stars (NSs) where nucleosynthesis of intermediate-mass elements occurs. The high surface gravity of an NS prevents the ...
    • The lively accretion disk in NGC 2992. III. Tentative evidence of rapid ultrafast outflow variability 

      Luminari, Alfredo; Marinucci, Andrea; Bianchi, Stefano; Marco, Barbara de; Feruglio, Chiara; Matt, Giorgio; Middei, Riccardo; Nardini, Emanuele; Piconcelli, Enrico; Puccetti, Simonetta; Tombesi, Francesco (Institute of Physics (IOP), 2023-06-01)
      Article
      Accés obert
      We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, observed at one of its highest flux levels in the X-rays. The time-averaged spectra of the two XMM-Newton orbits show ultrafast ...