Browsing by Author "Centre for Astrophysics Research (CAR)"

Now showing items 261-280 of 3233

    • Being a child with intellectual disabilities in hospital: The need for an individualised approach to care 

      Oulton, Kate; Gibson, Faith; Kenten, Charlotte; Russell, Jessica; Carr, Lucinda; Hassiotis, Angela; Kelly, Paula; Kerry, Sam; Tuffrey‐Wijne, Irene; Whiting, Mark; Wray, Jo (2023-10-04)
      Background: There is limited qualitative research focussed specifically on what it is like for children and young people with intellectual disabilities coming into hospital, with much of the evidence‐base being about those ...

    • Benchmark cool companions : Ages and abundances for the PZ Tel system 

      Jenkins, J. S.; pavlenko, Yakiv; Ivanyuk, Oleksiy; Gallardo, Jose; jones, Matias; day-jones, Avril; Jones, H.R.A.; Ruiz, Maria-Teresa; Pinfield, D.J.; Yakovina, Larissa (2012-03)
      We present new ages and abundance measurements for the pre-main sequence star PZ Tel. PZ Tel was recently found to host a young and low-mass companion. Using FEROS spectra we have measured atomic abundances (e.g. Fe and ...

    • Benchmark low-mass objects in Moving Groups 

      Galvez-Ortiz, M. C.; Kuznetsov, M.; Clarke, J. R. A.; Pavlenko, Ya. V.; Pinfield, D.J.; Jones, H.R.A.; Jenkins, J. S.; Barnes, J.; Burningham, B.; Day-Jones, A. C.; Martin, E. L.; Perez, A. E. Garcia; Pokorny, R.S. (EDP Sciences, 2013)
      In order to compile a sample of ultracool dwarfs that will serve as benchmarks for testing theoretical formation and evolutionary models, we selected low-mass cool (>M7) objects that are potentially members of five known ...

    • A Benchmark White Dwarf-Ultracool Dwarf Wide Field Binary 

      Ferreira, Thiago; Saito, Roberto K.; Minniti, Dante; Mejías, Andrea; Caceres, Claudio; Alonso-García, Javier; Beamín, Juan Carlos; Smith, Leigh C.; Gomez, Matías; Lucas, Philip W.; Ivanov, Valentin D. (2023-12-19)
      We present the discovery and multi-wavelength characterisation of VVV J1438-6158 AB, a new field wide-binary system consisting of a 4.6(+5.5-2.4) Gyr and Teff = 9500+/-125 K DA white dwarf (WD) and a Teff = 2400+/-50 K M8 ...

    • Benchmarking the power of amateur observatories for TTV exoplanets detection 

      Baluev, Roman V.; Sokov, Evgenii N.; Shaidulin, Vakhit Sh; Sokova, Iraida A.; Jones, H.R.A.; Tuomi, Mikko; Anglada-Escudé, Guillem; Benni, Paul; Colazo, Carlos A.; Schneiter, Matias E.; D'Angelo, Carolina S. Villarreal; Burdanov, Artem Yu; Fernández-Lajús, Eduardo; Baştürk, Özgür; Hentunen, Veli-Pekka; Shadick, Stan (2015-07-01)
      We perform an analysis of ~80000 photometric measurements for the following 10 stars hosting transiting planets: WASP-2, -4, -5, -52, Kelt-1, CoRoT-2, XO-2, TrES-1, HD 189733, GJ 436. Our analysis includes mainly transit ...

    • Berkeley 51, a young open cluster with four yellow supergiants 

      Negueruela, I.; Monguió, M.; Marco, A.; Tabernero, H. M.; González-Fernández, C.; Dorda, R. (2018-07-01)
      The heavily obscured open cluster Berkeley 51 shows characteristics typical of young massive clusters, even though the few previous studies have suggested older ages.We combine optical (UBV) and 2MASS photometry of the ...

    • Beryllium Abundances in Halo Stars from Keck/HIRES Observations 

      Boesgaard, A.M.; Deliyannis, C.P.; King, J.R.; Ryan, Sean G.; Vogt, S.; Beers, T.C. (1999)
      We have determined the abundance of Be in stars with an array of metal abundances in order to enhance our understanding of the chemical evolution of the Galaxy, cosmic-ray theory, and cosmology. Observations of the Be II ...

    • The best of both worlds : Combining LOFAR and Apertif to derive resolved radio spectral index images 

      Morganti, R.; Oosterloo, T. A.; Brienza, M.; Jurlin, N.; Prandoni, I.; Orru', E.; Shabala, S. S.; Adams, E. A. K.; Adebahr, B.; Best, P. N.; Coolen, A. H. W. M.; Damstra, S.; Blok, W. J. G. de; Gasperin, F. de; Denes, H.; Hardcastle, M.; Hess, K. M.; Hut, B.; Kondapally, R.; Kutkin, A. M.; Loose, G. M.; Lucero, D. M.; Maan, Y.; Maccagni, F. M.; Mingo, B.; Moss, V. A.; Mostert, R. I. J.; Norden, M. J.; Oostrum, L. C.; Rottgering, H. J. A.; Ruiter, M.; Shimwell, T. W.; Schulz, R.; Vermaas, N. J.; Vohl, D.; Hulst, J. M. van der; Diepen, G. M. van; Leeuwen, J. van; Ziemke, J. (2021-04-07)
      Supermassive black holes at the centres of galaxies can cycle through periods of activity and quiescence. Characterising the duty cycle of active galactic nuclei is crucial for understanding the impact of the energy they ...

    • Beta-decay studies of neutron-rich Sc, Ti, V, Cr 

      Sorlin, O.; Dorfler, T.; Anne, R.; Bohmer, W.; Borrel, V.; Guillemaud Mueller, D.; Grevy, S.; Kratz, K.L.; Lewitowicz, M.; Mehren, T.; Mueller, A.C.; Ostrowsky, A.; Pougheon, F.; Rauscher, T.; Robinson, M.; SaintLaurent, M.G.; SchmidtOtt, W.D. (Editions Frontieres, 1995)

    • Better age estimation using ultraviolet-optical colours : Breaking the age-metallicity degeneracy 

      Kaviraj, S.; Rey, S.-C.; Yoon, S.-J.; Yi, S.K.; Rich, R.M. (2007-10-01)
      We demonstrate that the combination of GALEX ultraviolet (UV) photometry in the far-UV (FUV; ~1530 Å) and near-UV (NUV; ~2310 Å) passbands with optical photometry in the standard U, B, V, R, I filters can efficiently break ...

    • Beware the recent past: a bias in spectral energy distribution modelling due to bursty star formation 

      Haskell, P.; Das, S.; Smith, D. J. B.; Cochrane, R. K.; Hayward, Christopher C.; Anglés-Alcázar, Daniel (2024-03-19)
      We investigate how the recovery of galaxy star formation rates (SFRs) using energy-balance spectral energy distribution (SED) fitting codes depends on their recent star formation histories (SFHs). We use the Magphys and ...

    • Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets 

      Bond, J.; Lauretta, D.S.; Tinney, C.G.; Butler, R.P.; Marcy, G.W.; Jones, H.R.A.; Carter, B.D.; O'Toole, S.; Bailey, J. (2008)
      We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd, and Eu (along with ...

    • Beyond the Solar Circle - Trends in Massive Star Formation Between the Inner and Outer Galaxy 

      Djordjevic, J. O.; Thompson, M. A.; Uruqhart, J. S.; Forbrich, J. (2019-07-01)
      We have compiled the most complete compact and ultracompact HII region catalogue to date via multi-wavelength inspection of survey data. We utilise data from the recently available SASSy 850$\mu$m survey to identify massive ...

    • Bgg revisited: The environments of low-excitation radio galaxies and unified models 

      Hardcastle, M.J. (2004-02)
      Recent measurements of the galaxy clustering environments around intermediate-redshift radio sources have suggested a systematic environmental difference between radio galaxies and radio-loud quasars, in contradiction to ...

    • Big Bang Nucleosynthesis, Population III, and Stellar Genetics in the Galactic Halo 

      Ryan, Sean G. (2002)
      The diverse isotopic and elemental signatures produced in different nucle- osynthetic sites are passed on to successive generations of stars. By tracing these chemical signatures back through the stellar populations of the ...

    • Binaries discovered by the MUCHFUSS project SDSS J08205+0008 - An eclipsing subdwarf B binary with brown dwarf companion 

      Geier, S.; Schaffenroth, V.; Drechsel, H.; Heber, U.; Kupfer, T.; Tillich, A.; Ostensen, R.; Smolders, K.; Degroote, P.; Maxted, P.F.L.; Barlow, B.N.; Gansicke, B.T.; Marsh, T.R.; Napiwotzki, R. (2011)
      Hot subdwarf B stars (sdBs) are extreme horizontal branch stars believed to originate from close binary evolution. Indeed about half of the known sdB stars are found in close binaries with periods ranging from a few hours ...

    • Binaries discovered by the SPY project IV. Five single-lined DA double white dwarfs 

      Nelemans, G.; Napiwotzki, R.; Karl, C.; Marsh, T.R.; Voss, B.; Roelofs, G.; Izzard, R.G.; Montgomery, M.; Reerink, T.; Christlieb, N.; Reimers, D. (2005)
      We present results from our ongoing follow-up observations of double white dwarf binaries detected in the ESO SN Ia Progenitor SurveY (SPY). We discuss our observing strategy and data analysis and present the orbital ...

    • Binaries discovered by the SPY project. I. HE 1047-0436: A subdwarf B white dwarf syste 

      Napiwotzki, R.; Edelmann, H.; Heber, U.; Karl, C.; Drechsel, H.; Pauli, E.M.; Christlieb, N. (2001-10)
      In the course of our search for double degenerate binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SNIa Progenitor surveY { SPY) we discovered that the sdB star HE1047−0436 ...

    • Binaries discovered by the SPY project. II. HE 1414-0848: A double degenerate with a mass close to the Chandrasekhar limit 

      Napiwotzki, R.; Koester, D.; Nelemans, G.; Yungelson, L.; Christlieb, N.; Renzini, A.; Reimers, D.; Drechsel, H.; Leibundgut, B. (2002-05)
      In the course of our search for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SNIa Progenitor surveY { SPY) we discovered that the white dwarf ...

    • Binaries discovered by the SPY project. III. HE 2209-1444: A massive, short period double degenerate 

      Karl, C.; Napiwotzki, R.; Nelemans, G.; Christlieb, N.; Koester, D.; Heber, U.; Reimers, D. (2003-11)
      In the course of our search for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY – SPY) we discovered HE2209−1444 to be ...