GAA - Grup d'Astronomia i Astrofísica: Recent submissions

Now showing items 1-12 of 285

    • Enquesta sobre la situació del col·lectiu del professorat associat a la Universitat Politècnica de Catalunya 

      Cornadó Bardón, Còssima; Haurie Ibarra, Laia; Mir Teixidor, Enrique; Morros Rubió, Josep Ramon; Mujica Delgado, Luis Eduardo; Olmedo Torre, Noelia; Peña Carrera, Marta; Sala Cladellas, Glòria (2021-03-15)
      External research report
      Open Access
      La utilització de la figura del professorat associat per part de les universitats públiques a Catalunya en molts casos està lluny de l’esperit d’aquesta figura en la legislació (especialista de reconeguda competència i amb ...

    • Self-gravitating barotropic equilibrium configurations of rotating bodies with smoothed particle hydrodynamics 

      García Senz, Domingo; Cabezón Gómez, Rubén Martín; Blanco Iglesias, José Miguel; Lorén Aguilar, Pablo (EDP Sciences, 2020-05-14)
      Article
      Open Access

    • The White Dwarf Binary Pathways Survey. V. The Gaia White Dwarf plus AFGK Binary Sample and the Identification of 23 Close Binaries 

      Ren, J. J.; Raddi, Roberto; Rebassa Mansergas, Alberto; Parsons, Steven G.; Irawati, Puji; Schreiber, Mathias R.; Gänsicke, Boris T.; Torres Gil, Santiago (Institute of Physics (IOP), 2020-12-10)
      Article
      Open Access
      Close white dwarf binaries consisting of a white dwarf and an A-, F-, G-, or K-type main-sequence star, henceforth close WD+AFGK binaries, are ideal systems to understand the nature of type Ia supernovae progenitors and ...

    • Simulations of stellar winds from X-ray bursts: Characterization of solutions and observable variables. 

      Herrera, Yago; Sala Cladellas, Glòria; José Pont, Jordi (EDP Sciences, 2020-06-19)
      Article
      Open Access
      Context. Photospheric radius expansion during X-ray bursts can be used to measure neutron star radii and help constrain the equation of state of neutron star matter. Understanding the stellar wind dynamics is important for ...

    • An extremely hot white dwarf with a rapidly rotating K-type subgiant companion: UCAC2 46706450 

      Werner, Klaus; Reindl, Nicole; Löbling, Lisa; Pelisoli, Ingrid; Schaffenroth, Veronika; Rebassa Mansergas, Alberto; Irawati, Puji; Ren, Juanjuan (EDP Sciences, 2020-10-01)
      Article
      Open Access
      Covenantee:   Eberhard Karls Universität Tübingen / Universität Potsdam / Institut d'Estudis Espacials de Catalunya / National Astronomical Research Institute of Thailand / Zhongguo ke xue yuan
      The subgiant UCAC2 46706450 is a late-type star with an ultraviolet (UV) excess. It was considered as a candidate to establish a sample of stars of spectral type F, G, and K with white dwarf (WD) companions that could be ...

    • Spectroscopy of P 30 and the abundance of Si 29 in presolar grains 

      Lotay, G.; Doherty, D.T.; Seweryniak, D.; Janssens, R.V.F.; José Pont, Jordi; Woods, Phil J. (American Physical Society, 2020-09-22)
      Article
      Open Access
      Covenantee:   University of Surrey / Argonne National Laboratory / University of North Carolina at Chapel Hill / Duke University / Institut d'Estudis Espacials de Catalunya / University of Massachusetts Lowell / University of Edinburgh
      The astrophysical 29Si(p,¿) reaction is expected to play a key role in determining the final 29Si yields ejected in nova explosions. Such yields are used to accurately identify the stellar origins of meteoritic stardust ...

    • The Compact binary HIgh CAdence Survey (CHiCaS): An overview 

      Pala, A. F.; Ederoclite, A; Gänsicke, Boris T.; Abril, J; Raddi, Roberto; Vázquez Ramió, H; Rebassa Mansergas, Alberto (2020-09-01)
      Article
      Restricted access - publisher's policy
      Covenantee:   European Southern Observatory / University of Warwick / Universidade de São Paulo / European Southern Observatory Chile / Centro de Estudios de Física del Cosmos de Aragón
      Cataclysmic Variables (CVs) are binaries in which a white dwarf accretes from a low-mass companion star. CVs are the best-suited laboratories to test our understanding of the evolution of compact, interacting binaries as ...

    • Gaia white dwarfs within 40 pc – I. Spectroscopic observations of new candidates 

      Tremblay, P. E.; Hollands, M.; Izquierdo Tugas, Pere; Gänsicke, Boris T.; Koester, D.; Brown, W J; Hermes, J. J.; Kleinman, Scot J.; Manser, C. J.; Marsh, Thomas R.; Schreiber, Mathias R.; Silvotti, R.; Rebassa Mansergas, Alberto; Raddi, Roberto (Oxford University Press, 2020-09-01)
      Article
      Open Access
      Covenantee:   University of Warwick / Universidad de La Laguna / Universitat Christian Albrecht de Kiel
      We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from Gaia Data Release 2 (DR2) and in ...

    • Search for nova presolar grains: gamma-ray Spectroscopy of Ar-34 and its relevance for the astrophysical Cl-33(p,gamma) reaction 

      José Pont, Jordi (American Institute of Physics (AIP), 2020-06-26)
      Article
      Open Access
      Covenantee:   University of Surrey / Argonne National Laboratory / Simon Fraser University
      The discovery of presolar grains in primitive meteorites has initiated a new era of research in the study of stellar nucleosynthesis. However, the accurate classification of presolar grains as being of specific stellar ...

    • Low-energy( 23)Al beta-delayed proton decay and Na-22 destruction in novae 

      Perez Loureiro, David; Wrede, Christopher; José Pont, Jordi (American Physical Society (APS), 2020-05-19)
      Article
      Open Access
      Covenantee:   Michigan State University / Universiṭah ha-ʻIvrit bi-Yerushalayim / University of Tennessee
      The radionuclide22Na is a target of¿-ray astronomy searches, predicted to be produced during thermonuclearrunaways driving classical novae. The22Na(p,¿)23Mg reaction is the main destruction channel of22Na during anova, ...

    • Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye 

      Rebassa Mansergas, Alberto (EDP Sciences, 2020-01-21)
      Article
      Open Access
      Covenantee:   Obserwatorium Astronomiczne Uniwersytetu Warszawskiego / Instytut Astronomiczny Uniwersytetu Wrocławskiego / Instituto de Astrofìsica de Canarias
      Gaia16aye was a binary microlensing event discovered in the direction towards the northern Galactic disc and was one of the first microlensing events detected and alerted to by the Gaia space mission. Its light curve ...

    • Experimentally well-constrained masses of 27P and 27S: implications for studies of explosive binary systems 

      Sun, Lijie; Xu, Xinxing; Hou, S.Q.; José Pont, Jordi (Elsevier, 2020-03-10)
      Article
      Open Access
      Covenantee:   Zhongguo yuan zi neng ke xue yan jiu yuan / University of Hong Kong / Shanghai jiao tong da xue
      The mass of 27P is expected to impact the X-ray burst (XRB) model predictions of burst light curves and the composition of the burst ashes, but large uncertainties and inconsistencies still exist in the reported 27P masses. ...