GAA - Grup d'Astronomia i Astrofísica
El Grup d' Astronomía i Astrofísica de la Universitat Politècnica de Catalunya (UPC) reuneix a un nombre reduit de persones interessades en una àmplia gama de temes de la Astronomía moderna. La història del grup va començar l'any 1995, just desprès de que alguns astrofísics perteneixents a dos departaments de física diferents (el departament de Física Aplicada, i el de Física i Enginyería Nuclear.) ajuntaran esforços per tal de crear un grup d'investigació competitiu en ciències de l'espai dins de la UPC. En la actualitat el GAA compta amb 7 investigadors permanents, a més de 6 estudiants doctorats i 11 estudiants postgraduats buscant aconseguir el seu doctorat. L'àrea principal d'actividad de la investigació del GAA pot ser classificada com Astrofísica Teórica. El tema és molt ampli, incloent-hi simulacions de computadora de les últimes etapes de la evolució estelar (l'enfriamient de les nanes blanques, AGBs, explosions de novas i supernovas, explosions de raigs X i física dels objectes compactes), estructura y dinàmica dels jets relacionats amb el PN i els objectes de l'Herbig-Haro i Cosmología. Alguns membres també estàn interessats en altres areas, incloent-hi estudis del comportament cinemàtic de estrelles en la vecindad Solar així com el diseny de la instrumentació que serà utilitzada per els satèlits científics.
Col·leccions
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Articles de revista [299]
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Carta nàutica [1]
Enviaments recents
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White dwarf spectral type-temperature distribution from Gaia DR3 and the Virtual Observatory
(EDP Sciences, 2023-09-21)
Article
Accés obertContext. 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
(Oxford University Press, 2023-02-01)
Article
Accés obertThe 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
(EDP Sciences, 2023-10-01)
Article
Accés obertPlanetary 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
(Institute of Physics (IOP), 2023-11-13)
Article
Accés obertWe 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
(Oxford University Press, 2023-10-06)
Article
Accés obertMagnetic 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
(American Physical Society, 2023-11-22)
Article
Accés restringit per política de l'editorialThe 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
(American Physical Society, 2023-09-14)
Article
Accés obertThe 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
(Springer, 2023-11-24)
Article
Accés obertThe 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
(Oxford University Press, 2023-10-25)
Article
Accés obertWe 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
(Oxford University Press, 2023-10-01)
Article
Accés obertUltra-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
(Oxford University Press, 2023-10-12)
Article
Accés obertWe 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
(2023-09-22)
Article
Accés obertClassical 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 ...
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