Now showing items 1059-1078 of 1081

  • V346 Normae: First post-outburst observations of an FU Orionis star 

    Kraus, S; Caratti o Garatti, A.; Garcia-Lopez, R.; Kreplin, A.; Aarnio, A.; Monnier, J.D.; Naylor, T.; Weigelt, G. (Oxford University Press (OUP) on behalf of the Royal Astronomical Society, 2016-06-27)
    During their formation phase stars gain most of their mass in violent episodic accretion events, such as observed in FUOrionis (FUor) and EXor stars. V346Normae is a well-studied FUor that underwent a strong outburst ...
  • Variable-phase method and Levinson's theorem in two dimensions: Application to a screened Coulomb potential 

    Portnoi, M.E.; Galbraith, I. (Elsevier, 1997)
    The variable-phase approach is applied to scattering and bound states in an attractive Coulomb potential, statically screened by a two-dimensional (2D) electron gas. A 2D formulation of Levinson's theorem is used for ...
  • Variations of the stellar initial mass function in the progenitors of massive early-type galaxies and in extreme starburst environments 

    Chabrier, G; Hennebelle, P; Charlot, P (American Astronomical Society / IOP Publishing, 2014-11-06)
    We examine variations of the stellar initial mass function (IMF) in extreme environments within the formalism derived by Hennebelle & Chabrier. We focus on conditions encountered in progenitors of massive early-type galaxies ...
  • Viscoelasticity of Amyloid Plaques in Transgenic Mouse Brain Studied by Brillouin Microspectroscopy and Correlative Raman Analysis 

    Mattana, S; Caponi, S; Tamagnini, F; Fioretto, D; Palombo, F (World Scientific Publishing, 2017-04-21)
    Amyloidopathy, one of the most prominent hallmarks of Alzheimer’s disease - the leading cause of dementia worldwide, is characterized by the accumulation of amyloid plaques in the brain parenchyma. The plaques consist of ...
  • VLT FORS2 comparative transmission spectroscopy: Detection of Na in the atmosphere of WASP-39b from the ground 

    Nikolov, N; Sing, David K.; Gibson, Neale P.; Fortney, J. J.; Evans, Thomas M.; Barstow, Joanna K.; Kataria, Tiffany; Wilson, Paul A. (American Astronomical Society, 2016-12-01)
    We present transmission spectroscopy of the warm Saturn-mass exoplanet WASP-39b made with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) across the wavelength range 411–810 nm. The transit depth is measured ...
  • VLT/FORS2 comparative transmission spectroscopy II: confirmation of a cloud-deck and Rayleigh scattering in WASP-31b, but no potassium? 

    Gibson, NP; Nokolov, N; Sing, DK; Barstow, J; Evans, TE; Kataria, T; Wilson, PA (Oxford University Press (OUP) / Royal Astronomical Society, 2017-0211)
    We present transmission spectroscopy of the hot-Jupiter WASP-31b using FORS2 on the VLT during two primary transits. The observations cover a wavelength range of ≈400–840 nm. The light curves are corrupted by significant ...
  • VLTI-AMBER velocity-resolved aperture-synthesis imaging of η Carinae with a spectral resolution of 12 000. Studies of the primary star wind and innermost wind-wind collision zone 

    Weigelt, G; Hofmann, K-H; Schertl, D; Clementel, N; Corcoran, MF; Damineli, A; de Wit, W-J; Grellmann, R; Groh, J; Guieu, S; Gull, T; Heininger, M; Hillier, DJ; Hummel, CA; Kraus, S; Madura, T; Mehner, A; Mérand, A; Millour, F; Moffat, AFJ; Ohnaka, K; Patru, F; Petrov, RG; Rengaswamy, S; Richardson, ND; Rivinius, T; Schöller, M; Teodoro, M; Wittkowski, M (EDP Sciences, 2016-10)
    Context. The mass loss from massive stars is not understood well. η Carinae is a unique object for studying the massive stellar wind during the luminous blue variable phase. It is also an eccentric binary with a period of ...
  • Voltage dependent director of a homeotropic negative liquid crystal cell 

    Ruan, Lizhen; Yang, Fuzi; Sambles, J. Roy (American Institute of Physics, 2008)
    Thin layers of obliquely (60° to normal) thermally evaporated SiOx lead to homeotropic alignment of a nematic liquid crystal (LC) having negative dielectric anisotropy. Under application of an ac voltage the director, as ...
  • The VST photometric hα survey of the Southern Galactic Plane and Bulge (VPHAS+) 

    Drew, JE; Gonzalez-solares, E; Greimel, R; Irwin, MJ; Küpcü Yoldas, A; Lewis, J; Barentsen, G; Eislöffel, J; Farnhill, HJ; Martin, WE; Walsh, JR; Walton, NA; Mohr-Smith, M; Raddi, R; Sale, SE; Wright, NJ; Groot, P; Barlow, MJ; Corradi, RLM; Drake, JJ; Fabregat, J; Frew, DJ; Gänsicke, BT; Knigge, C; Mampaso, A; Morris, RAH; Naylor, T; Parker, QA; Phillipps, S; Ruhland, C; Steeghs, D; Unruh, YC; Vink, JS; Wesson, R; Zijlstra, AA (Oxford University Press, 2014-04-02)
    The VST Photometric Hα Survey of the Southern Galactic Plane and Bulge (VPHAS+) is surveying the southern Milky Way in u, g, r, i and Hα at ~1 arcsec angular resolution. Its footprint spans the Galactic latitude range -5o ...
  • VUV-absorption cross section of CO2 at high temperatures and impact on exoplanet atmospheres 

    Venot, O; Fray, N; Bénilan, Y; Gazeau, M-C; Hébrard, E; Larcher, G; Schwell, M; Dobrijevic, M; Selsis, F (EDP Sciences, 2014)
    Ultraviolet (UV) absorption cross sections are an essential ingredient of photochemical atmosphere models. Exoplanet searches have unveiled a large population of short-period objects with hot atmospheres, very different ...
  • Water vapour in the atmosphere of a transiting extrasolar planet 

    Tinetti, Giovanna; Vidal-Madjar, A.; Liang, Mao-Chang; Beaulieu, Jean-Philippe; Yung, Yuk; Carey, Sean; Barber, Robert J.; Tennyson, Jonathan; Ribas, Ignasi; Allard, Nicole; Ballester, G.; Sing, David K.; Selsis, Frank (Nature Publishing Group, 2007)
    Water is predicted to be among the most abundant (if not the most abundant) molecular species after hydrogen in the atmospheres of close-in extrasolar giant planets ('hot Jupiters'). Several attempts have been made to ...
  • Wave propagation in complex coordinates 

    Horsley, SAR; King, CG; Philbin, TG (IOP Publishing, 2016-04-01)
    We give an interpretation for the use of complex spatial coordinates in electromagnetism, in terms of a family of closely related inhomogeneous media. Using this understanding we find that the phenomenon of reflection can ...
  • Waveguide arrays as plasmonic metamaterials: transmission below cutoff 

    Hibbins, Alastair P.; Lockyear, Matthew J.; Hooper, Ian R.; Sambles, J. Roy (American Physical Society, 2006)
    Since the work of Ebbesen et al. [Nature (London) 391, 667 (1998)], there has been immense interest in the optical properties of subwavelength holes in metal layers. While the enhanced transmission observed is generally ...
  • What can simulated molecular clouds tell us about real molecular clouds? 

    Duarte-Cabral, A; Dobbs, CL (Oxford University Press, 2016-03-03)
    © 2016 The Authors.We study the properties of giant molecular clouds (GMCs) from a smoothed particle hydrodynamics simulation of a portion of a spiral galaxy, modelled at high resolution, with robust representations of the ...
  • White dwarf dynamical interactions and fast optical transients 

    Garcia-Berro, E; Badenes, C; Aznar-Siguan, G; Loren-Aguilar, P (Oxford University Press (OUP) / Royal Astronomical Society, 2017-04-03)
    Recent advances in time-domain astronomy have uncovered a new class of optical transients with timescales shorter than typical supernovae and a wide range of peak luminosities. Several subtypes have been identi ed within ...
  • Wolf-Rayet spin at low metallicity and its implication for Black Hole formation channels 

    Vink, J; Harries, TJ (EDP Sciences, 2017-04-12)
    Context. The spin of Wolf-Rayet (WR) stars at low metallicity (Z) is most relevant for our understanding of gravitational wave sources such as GW150914, as well as the incidence of long-duration gamma-ray bursts (GRBs). ...
  • X-ray diffraction from bone employing annular and semi-annular beams. 

    Dicken, AJ; Evans, JP; Rogers, KD; Stone, N; Greenwood, C; Godber, SX; Prokopiou, D; Clement, JG; Lyburn, ID; Martin, RM; Zioupos, P (IOP Publishing, 2015-08-07)
    There is a compelling need for accurate, low cost diagnostics to identify osteo-tissues that are associated with a high risk of fracture within an individual. To satisfy this requirement the quantification of bone ...
  • The X-ray source population of the globular cluster M15: Chandra high-resolution imaging 

    Hannikainen, DC; Charles, PA; van Zyl, L; Kong, AKH; Homer, L; Hakala, P; Naylor, T; Davies, MB (Oxford University Press (OUP) / Royal Astronomical Society, 2005-02-01)
    The globular cluster M15 was observed on three occasions with the High Resolution Camera on-board Chandra in 2001 in order to investigate the X-ray source population in the cluster centre. After subtraction of the two ...
  • Young Stellar Objects in the Gould Belt 

    Dunham, MM; Allen, LE; Evans, NJ; Broekhoven-Fiene, H; Cieza, LA; Di Francesco, J; Gutermuth, Robert A.; Harvey, P.M.; Hatchell, Jennifer; Heiderman, A; Huard, TL; Johnstone, D; Kirk, JM; Matthews, BC; Miller, JF; Peterson, DE; Young, KE (American Astronomical Society, 2015-09-01)
    We present the full catalog of Young Stellar Objects (YSOs) identified in the 18 molecular clouds surveyed by the Spitzer Space Telescope “cores to disks” (c2d) and “Gould Belt” (GB) Legacy surveys. Using standard techniques ...
  • Zero reflection and transmission in graded index media 

    King, CG; Horsley, SAR; Philbin, TG (Springer Verlag, 2016-05-06)
    Graded index media whose electric susceptibility satisfies the spatial Kramers-Kronig relations are known to be one-way reflectionless to electromagnetic radiation, for all angles of incidence. We demonstrate how a family ...