University of Hertfordshire

Browsing by Author "Centre for Astrophysics Research"

University of Hertfordshire Research Archive

Help | UH Research Archive

Browsing by Author "Centre for Astrophysics Research"

Sort by:Order:Results:

  • 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 ...
  • 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 ...
  • 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)
  • 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 ...
  • 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 ...
  • Geier, S.; Napiwotzki, R.; Heber, U.; Nelemans, G. (2011)
    Hot subdwarf B stars (sdBs) in close binary systems are assumed to be formed via common envelope ejection. According to theoretical models, the amount of energy and angular momentum deposited in the common envelope scales ...
  • Lucatello, S.; Tsangarides, S.; Beers, T.C.; Carretta, E.; Gratton, R.G.; Ryan, Sean G. (2005)
    We discuss radial velocities for a sample of carbon-enhanced, s-process–rich, very metal-poor (CEMP-s) stars, analyzed with high-resolution spectroscopy obtained over multiple epochs. We find that ~68% of the stars in the ...
  • Wheelwright, H.E.; Vink, J.S.; Oudmaijer, R.D.; Drew, J.E. (American Institute of Physics, 2012)
    Most intermediate mass, pre-main-sequence Herbig Ae/Be stars reside in binary systems. As they are young, the properties of these systems allow us to constrain how they form. We have investigated the formation of Herbig ...
  • Fernandes, Cristina A. C.; Jarvis, M.J.; Martínez-Sansigre, Alejo M. S.; Rawlings, Steve G.; Afonso, José M.; Hardcastle, M.J.; Lacy, Mark; Stevens, Jason A.; Vardoulaki, Eleni (2015-02-21)
    Understanding the evolution of accretion activity is fundamental to our understanding of how galaxies form and evolve over the history of the Universe. We analyse a complete sample of 27 radio galaxies which includes both ...
  • Dunlop, J.S.; Ade, P.A.R.; Bock, J.J.; Chapin, E.L.; Cirasuolo, M.; Coppin, Kristen; Devlin, M.J.; Griffin, M.; Greve, T.R.; Gundersen, J.O.; Halpern, M.; Hargrave, P.C.; Hughes, D.H.; Ivison, R.J.; Klein, J.; Kovacs, A.; Marsden, G.; Mauskopf, P.; Netterfield, Calvin B.; Olmi, L.; Pascale, E.; Patanchon, G.; Rex, M.; Scott, D.; Semisch, C.; Smail, I.; Targett, T.A.; Thomas, N.; Truch, M.D.P.; Tucker, C.; Tucker, G.S.; Viero, M.P.; Walter, F.; Wardlow, J. L.; Weiss, A.; Wiebe, D.V. (2010-11-01)
    We identify and investigate the nature of the 20 brightest 250 μm sources detected by the Balloon-borne Large Aperture Submillimetre Telescope (BLAST) within the central 150 arcmin of the Great Observatories Origins Deep ...
  • Ivison, R.J.; Alexander, David M.; Biggs, Andy D.; Brandt, W.N.; Chapin, E.L.; Coppin, Kristen; Devlin, Mark J.; Dickinson, Mark; Dunlop, James; Dye, Simon; Eales, Stephen A.; Frayer, David T.; Halpern, Mark; Hughes, David H.; Ibar, Edo; Kovacs, A.; Marsden, Gaelen; Moncelsi, L.; Netterfield, Calvin B.; Pascale, Enzo; Patanchon, Guillaume; Rafferty, D. A.; Rex, Marie; Schinnerer, Eva; Scott, Douglas; Semisch, C.; Smail, Ian; Swinbank, A. M.; Truch, Matthew D.P.; Tucker, Gregory S.; Viero, M.P.; Walter, Fabian; Weiss, Axel; Wiebe, Donald V.; Xue, Y.Q. (2010)
    We investigate the correlation between far-infrared (FIR) and radio luminosities in distant galaxies, a lynchpin of modern astronomy. We use data from the Balloon-borne Large Aperture Submillimetre Telescope (BLAST), ...
  • Harris, A.I.; Baker, A. J.; Frayer, D. T.; Smail, Ian; Swinbank, A.M.; Riechers, D. A.; van der Werf, P. P.; Auld, R.; Baes, M.; Bussmann, R. S.; Buttiglione, S.; Cava, A.; Clements, D. L.; Cooray, A.; Dannerbauer, H.; Dariush, A.; De Zotti, G.; Dunne, L.; Dye, S.; Eales, S.; Fritz, J.; Gonzalez-Nuevo, J.; Hopwood, R.; Ibar, E.; Ivison, R. J.; Jarvis, M.J.; Maddox, S.; Negrello, M.; Rigby, E.; Smith, Daniel; Temi, P.; Wardlow, J. (2012-06-20)
    We report measurements of the carbon monoxide ground state rotational transition ((CO)-C-12-O-16 J = 1-0) with the Zpectrometer ultrawideband spectrometer on the 100 m diameter Green Bank Telescope. The sample comprises ...
  • Murray, D. N.; Burningham, B.; Jones, H.R.A.; Pinfield, D. J.; Lucas, P. W.; Leggett, S. K.; Tinney, C. G.; Day-Jones, A. C.; Weights, D. J.; Lodieu, N.; Perez Prieto, J. A.; Nickson, E.; Zhang, Z. H.; Clarke, J. R. A.; Jenkins, J. S.; Tamura, M. (2011-06)
    We have used blue near-infrared colours to select a group of 12 spectroscopically confirmed United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) T dwarfs later than T4. From amongst these, we identify ...
  • Frischknecht, U.; Hirschi, R.; Meynet, G.; Ekstroem, S.; Georgy, C.; Rauscher, T.; Winteler, C.; Thielemann, F-K. (Cambridge University Press, 2010)
    The treatment of mixing is still one of the major uncertainties in stellar evolution models. One open question is how well the prescriptions for rotational mixing describe the real effects. We tested the mixing prescriptions ...
  • Duncan, D.K.; Rebull, L.M.; Primas, F.; Boesgaard, A.M.; Deliyannis, C.P.; Hobbs, L.M.; King, J.R.; Ryan, Sean G. (1998)
    The Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST) has been used to observe the boron 2500 °A region of BD −13 3442. At a metallicity of [Fe/H]=−3.00 this is the most metal- poor star ever ...
  • Barnes, J R; James, D J; Cameron, A C (2002)
    With the advent of 8-m class telescopes and model atmospheres incorporating molecular opacities a great deal of interest has been directed towards the previously unexplored cool, low mass stars. M dwarfs are obviously a ...
  • Rauscher, T. (2006-01)
    The location of the (gamma,p)/(gamma,n) and (gamma,alpha)/(gamma,n) line at gamma process temperatures is discussed, using updated reaction rates based on global Hauser-Feshbach calculations. The results can be directly ...
  • Catalan, S.; Tremblay, P. -E.; Pinfield, D. J.; Smith, L. C.; Zhang, Z. H.; Napiwotzki, R.; Marocco, F.; Day-Jones, A. C.; Gomes, J.; Forde, K.P.; Lucas, P. W.; Jones, H.R.A. (2012-10)
    We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo ...
  • Sobral, D.; Best, P.N.; Geach, J.E.; Smail, I.; Kurk, J.; Cirasuolo, M.; Casali, M.; Ivison, R.J.; Coppin, Kristen; Dalton, G.B. (2009-09-01)
    New results are presented, as part of the Hi-z Emission Line Survey (HizELS), from the largest area survey to date (1.4 deg ) for Lyα emitters (LAEs) at z ~ 9. The survey, which is primarily targeting Hα emitters at z <3, ...
  • Burleigh, Matt R.; Steele, Paul R.; Dobbie, Paul D.; Farihi, Jay; Napiwotzki, Ralf; Maxted, Pierre F. L.; Barstow, Martin A.; Jameson, Richard F.; Casewell, Sarah L.; Gaensicke, Boris T.; Marsh, Tom R. (American Institute of Physics, 2011)
    Brown dwarf companions to white dwarfs are rare, but recent infra-red surveys are slowly revealing examples. We present new observations of the post-common envelope binary WD0137-349, which reveals the effects of irradiation ...

Your requested file is now available for download. You may start your download by selecting the following link: test