Articles de revista: Enviaments recents

Ara es mostren els items 1-12 de 299

    • White dwarf spectral type-temperature distribution from Gaia DR3 and the Virtual Observatory 

      Torres Gil, Santiago; Cruz Gamba, Patricia; Murillo Ojeda, Raquel; Jiménez Esteban, F. M.; Rebassa Mansergas, Alberto; Solano Márquez, Enrique; Camisassa, María Eugenia; Raddi, Roberto; Doliguez Le Lourec, J. (EDP Sciences, 2023-09-21)
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      Context. The characterization of white dwarf atmospheres is crucial for accurately deriving stellar parameters such as effective temperature, mass, and age. However, the inclusion of physical processes such as convective ...

    • Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the virtual observatory 

      Jiménez Esteban, F. M.; Torres Gil, Santiago; Rebassa Mansergas, Alberto; Cruz Gamba, Patricia; Murillo Ojeda, Raquel; Solano Márquez, Enrique; Rodrigo Blanco, Carlos; Camisassa, María Eugenia (Oxford University Press, 2023-02-01)
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      The third data release of Gaia has provided low resolution spectra for 100 000 white dwarfs (WDs) that, together with the excellent photometry and astrometry, represent an unrivalled benchmark for the study of this ...

    • 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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      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)
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      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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      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)
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      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)
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      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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      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)
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      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)
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      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)
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      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)
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      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 ...