Browsing by Title

Now showing items 20569-20588 of 24122

    • Spectral Analysis of sdB Stars from the Hamburg ESO Survey 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Lemke, M.; Christlieb, N. (2001)

    • Spectral analysis of sdB Stars from the Hamburg ESO Survey 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Lemke, M.; Christlieb, N. (Astronomical Society of the Pacific, 2001)
      We aim at the compilation of a statistically complete sample of sdB stars in the southern hemisphere. Candidates are selected from the database of digitized spectra of the Hamburg/ESO objective prism survey. First simulations ...

    • Spectral analysis of sdB Stars from the Hamburg Quasar Survey 

      Edelmann, H.; Heber, U.; Hagen, H.J.; Dreizler, S.; Napiwotzki, R.; Engels, D.; Lemke, M. (2003-03)

    • Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope 

      Bonnassieux, Etienne; Sweijen, Frits; Brienza, Marisa; Rajpurohit, Kamlesh; Riseley, Christopher John; Bonafede, Annalisa; Jackson, Neal; Morabito, Leah K.; Brunetti, Gianfranco; Harwood, Jeremy; Kappes, Alex; Rottgering, Huub J.; Tasse, Cyril; Weeren, Reinout van (2022-02-25)
      3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectral studies have been limited due to a lack ...

    • Spectral analysis of the binary sdB star Feige 36 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Reid, I.N.; Saffer, R. (Astronomical Society of the Pacific, 1999)
      The sdB stars Feige 36 is a short-period, single-lined spectroscopic binary. Aymospheric parameters and abundances are determined from high-resolution Keck spectra. Feige 36 lies near the zero-age extreme Horizontal Branch ...

    • Spectral analysis of the DNA targeting bisalkylaminoanthraquinone DRAQ5 in intact living cells 

      Njoh, Kerenza L.; Patterson, Laurence H.; Zloh, Mire; Wiltshire, Marie; Fisher, Janet; Chappell, Sally; Ameer-Beg, Simon; Bai, Yanhong; Matthews, Daniel; Errington, Rachel J.; Smith, Paul J. (2006-08)
      We report on the potential DNA binding modes and spectral characteristics of the cell-permeant far red fluorescent DNA dye, DRAQ5, in solution and bound within intact cells. Our aim was to determine the constraints for its ...

    • Spectral analysis of water vapour in cool stars 

      Jones, H.R.A.; Pavlenko, Y.; Viti, S.; Tennyson, J. (2002-03)

    • Spectral and Photometric evolution of young stellar poplations: The impact of gaseous emission at various metallicites 

      Anders, P.; Fritze, U. (2003)

    • The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies 

      Brassington, Nicola; Fabbiano, G.; Zezas, A.; Kim, D.-W.; Fragos, T.; Kundu, A.; King, A.R.; Pellegrini, S.; Trinchieri, G.; Zepf, S.; Wright, N.J. (2012-08-20)
      We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, ...

    • Spectral classification of photometrically selected AGB candidates in NGC 6822 

      Sibbons, L. F.; Ryan, Sean G.; Napiwotzki, Ralf; Thompson, G. P. (2015-02-02)
      Context. The ratio of C- and M-type asymptotic giant branch (AGB) stars is commonly used to estimate the metallicity of extragalactic populations. Sources in the AGB population must therefore be accurately classified as ...

    • Spectral energy distribution and radio halo of NGC253 at low radio frequencies 

      Kapinska, A. D.; Staveley-Smith, L.; Crocker, R.; Meurer, G. R.; Bhandari, S.; Hurley-Walker, N.; Offringa, A. R.; Hanish, D. J.; Seymour, N.; Ekers, R. D.; Bell, M. E.; Callingham, J. R.; Dwarakanath, K. S.; For, B. -Q.; Gaensler, B. M.; Hancock, P. J.; Hindson, Luke; Johnston-Hollitt, M.; Lenc, E.; McKinley, B.; Morgan, J.; Procopio, P.; Wayth, R. B.; Wu, C.; Zheng, Q.; Barry, N.; Beardsley, A. P.; Bowman, J. D.; Briggs, F.; Carroll, P.; Dillon, J. S.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Hazelton, B. J.; Hewitt, J. N.; Jacobs, D. J.; Kim, H. -S.; Kittiwisit, P.; Line, J.; Loeb, A.; Mitchell, D. A.; Morales, M. F.; Neben, A. R.; Paul, S.; Pindor, B.; Pober, J. C.; Riding, J.; Sethi, S. K.; Shankar, N. Udaya; Subrahmanyan, R.; Sullivan, I. S.; Tegmark, M.; Thyagarajan, N.; Tingay, S. J.; Trott, C. M.; Webster, R. L.; Wyithe, S. B. (2017-03-27)
      We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC253 ...

    • Spectral energy distribution for GJ406 

      Pavlenko, Y.; Jones, H.R.A.; Lyubchik, Y.; Tennyson, J.; Pinfield, D.J. (2006)

    • The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum 

      Galvin, T J; Seymour, N.; Marvil, J.; Filipovic, M D; Tothill, N.F.H.; McDermid, Richard M.; Hurley-Walker, N.; Hancock, P. J.; Callingham, J. R.; Cook, R H; Norris, Ray P.; Bell, M E; Dwarakanath, K. S.; For, B. -Q.; Gaensler, B. M.; Hindson, L; Johnston-Hollitt, M.; Kapińska, A. D.; Lenc, E.; McKinley, B.; Morgan, J; Offringa, A. R.; Procopio, P.; Staveley-Smith, L.; Wayth, R. B.; Wu, C.; Zheng, Q. (2018-02-01)
      We have acquired radio-continuum data between 70MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. ...

    • Spectral evidence for dust in late-type M dwarfs 

      Jones, H.R.A.; Tsuji, Takashi (1997-02-13)
      We have found a dramatic change in the spectra of late-type M dwarfs at wavelengths shorter than 0.75 microns. Comparisons with synthetic spectra illustrate that this change is well explained by the presence of dust. It ...

    • The Spectral Evolution of High-Frequency Radio Outbursts in the Blazar PKS:0420-014 

      Stevens, Jason; Litchfield, S. J.; Robson, E. I.; Gear, W. K.; Terasranta, H.; Tornikoski, M.; Valtaoja, E. (1995-08-01)
      Multifrequency monitoring data between 375 and 22 GHz are used to investigate spectral evolution of radio outbursts in the blazar 0420-014. It is shown that, after subtraction of the underlying `quiescent' emission, the ...

    • Spectral Modulation, or Ripple, in Retardation Plates for Linear and Circular Polarization 

      Aitken, D.; Hough, J. (2001)

    • Spectral Monitoring of HS 0209+0832 a DAB White Dwarf in the DB Gap 

      Edelmann, H.; Heber, U.; Napiwotzki, R. (Astronomical Society of the Pacific, 2001)
      We report results of a spectral monitoring campagne of the DAB white dwarf HS 0209+0832, for which helium line profile variations were reported earlier (Heber et al. 1997). This finding is confirmed by our discovery of a ...

    • Spectral Parameters for Scattering Amplitudes in N=4 Super Yang-Mills Theory 

      Ferro, Livia; Lukowski, Tomasz; Meneghelli, Carlo; Plefka, Jan; Staudacher, Matthias (2014-01-17)
      Planar N=4 Super Yang-Mills theory appears to be a quantum integrable four-dimensional conformal theory. This has been used to find equations believed to describe its exact spectrum of anomalous dimensions. Integrability ...

    • Spectral properties of X-ray binaries in Centaurus A 

      Burke, M.J.; Raychaudhury, S.; Kraft, R.P.; Forman, W.R.; Jones, C.; Murray, S.S.; Birkinshaw, M.; Evans, D.A.; Jordán, A.; Worrall, D.M.; Maccarone, T. J.; Croston, J.H.; Brassington, Nicola; Hardcastle, M.J.; Goodger, J.L.; Kainulainen, J.; Woodley, K.A.; Sivakoff, G.R.; Gilfanov, M.; Zhang, Z.; Sarazin, C.L.; Voss, R. (2013-04-01)
      We present a spectral investigation of X-ray binaries (XBs) in NGC 5128 (Cen A), using six 100 ks Chandra observations taken over two months in 2007. We divide our sample into thermally and non-thermally dominated states ...

    • The spectral structure and energetics of powerful radio sources 

      Harwood, J. J.; Hardcastle, M J.; Croston, J. H.; Stroe, A.; Morganti, R.; Orru, E. (2014-04-29)
      Determining the energy spectrum of an electron population can give key insights into the underlying physics of a radio source; however, the lack of high resolution, broad-bandwidth observations has left many ambiguities ...