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Browsing by Author "Centre for Astrophysics Research"

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  • Vogt, K.; Mohr, P.; Rauscher, T.; Sonnabend, K.; Zilges, A. (2003-05-05)
    (gamma,n) cross sections and reaction rates in the astrophysical gamma-process have been measured for the nucleus Pb-204 using the method of photoactivation. Some peculiarities of the (gamma,n) cross.section of this nucleus ...
  • Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-19)
    We present our method to determine the (n,gamma) reaction rates of s-process branching point nuclei using data of the inverse (gamma,n) reaction. As an example, we selected Zr-95. The analysis of the data of the reaction ...
  • Sauerwein, A.; Becker, H. -W.; Dombrowski, H.; Elvers, M.; Endres, J.; Giesen, U.; Hasper, J.; Hennig, A.; Netterdon, L.; Rauscher, T.; Rogalla, D.; Zell, K. O.; Zilges, A. (2011-10-19)
    The reaction Pr-141(alpha, n)Pm-144 was investigated between E-alpha = 11 MeV and 15 MeV with the activation method using the gamma gamma coincidence method with a segmented clover-type high-purity Germanium (HPGe) detector. ...
  • Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-05)
    The (gamma,n) reaction rate of W-186 was measured in order to deduce the (n,gamma) reaction rate of 185 W, an important branching point in the astrophysical s-process. The theoretical predictions have been confirmed and ...
  • Verbeek, Kars; Groot, Paul J.; Nelemans, Gijs A.; Scaringi, Simone; Napiwotzki, R.; Drew, J.E.; Steeghs, D.T.H.; Casares, Jorge; Corral-Santana, J.M.; Gänsicke, Boris T.; González-Solares, E.A.; Greimel, Robert; Heber, Ulrich; Irwin, Mike J.; Knigge, Christian; Wright, N.J.; Zijlstra, Albert (2013-10-01)
    We present a determination of the average space density and birth rate of hydrogen-line (DA) white dwarfs within a radius of 1 kpc around the Sun, based on an observational sample of 360 candidate white dwarfs with g <19.5 ...
  • Kiss, G. G.; Rauscher, T.; Szuecs, T.; Kertesz, Zs.; Fueloep, Zs.; Gyuerky, Gy.; Froehlich, C.; Farkas, J.; Elekes, Z.; Somorjai, E. (2011-01-17)
    The cross sections of the Tm-169(alpha, gamma)Lu-173 and Tm-169(alpha,n)Lu-172 reactions have been measured first time using a new method, by detecting the characteristic X-ray radiation following the electron capture-decay ...
  • Rauscher, T. (IOP PUBLISHING LTD, 2010)
    Nuclear reactions proceed differently in stellar plasmas than in the laboratory due to the thermal effects in the plasma. On one hand, a target nucleus is bombarded by projectiles distributed in energy with a distribution ...
  • Barnes, J R; James, D J; Cameron, A C (2004-08-01)
    We present images of the rapidly rotating (P-rot = 0.431 d) M1.5Ve dwarf HK Aqr, from data obtained during 2001 and 2002. Star-spots are found distributed at a range of latitudes during both observing seasons, but unlike ...
  • Johansson, Jonas; Woods, Tyrone E.; Gilfanov, Marat; Sarzi, Marc; Chen, Yan Mei; Oh, Kyuseok (2014-08-01)
    We measure the strength of He II λ4686 nebular emission in passively evolving ('retired') galaxies, aiming to constrain their populations of hot accreting white dwarfs (WDs) in the context of the single-degenerate (SD) ...
  • Farrah, D.; Urrutia, T.; Lacy, Mark; Efstathiou, A.; Afonso, Jose; Coppin, Kristen; Hall, P.B.; Lonsdale, C.J.; Jarrett, Tom; Bridge, Carrie; Borys, C.; Petty, Sara (2012-02)
    We present optical to far-infrared photometry of 31 reddened QSOs that show evidence for radiatively driven outflows originating from active galactic nuclei (AGNs) in their rest-frame UV spectra. We use these data to study ...
  • Salter, Graeme S.; Tinney, Chris G.; Wittenmyer, Robert A.; Jenkins, James S.; Jones, H.R.A.; O'Toole, Simon J. (2013-06)
    We are finally entering an era where radial velocity and direct imaging parameter spaces are starting to overlap. Radial velocity measurements provide us with a minimum mass for an orbiting companion (the mass as a function ...
  • Rauscher, T.; Guber, K. H. (2002-08)
    Direct neutron capture on Ni-62 is calculated in the DWBA and the Maxwellian averaged cross sections and astrophysical reaction rates in the energy range relevant for s-process nucleosynthesis are given. It is confirmed ...
  • Krausmann, E.; Balogh, W.; Oberhummer, H.; Rauscher, T.; Kratz, K.L.; Ziegert, W. (1996-01)
    In neutron capture for magic-shell nuclei the direct reaction mechanism can be important and may even dominate. As an example we investigated the reaction Ca-48(n, gamma)Ca-49 for projectile energies below 250 keV in a ...
  • Riaz, B.; Lodieu, N.; Goodwin, S.; Stamatellos, D.; Thompson, M. (2012-03-01)
    We have investigated the brown dwarf (BD) and stellar disc fractions in the Upper Scorpius OB Association (USco) and compared them with several other young regions. We have compiled the most complete sample of of all ...
  • Witham, A.R.; Knigge, C.; Drew, J.E.; Groot, P.; Greimel, R.; Parker, Q. A. (American Institute of Physics, 2005)
    A deep (R ~ 19.5) photographic Hα Survey of the southern Galactic Plane was recently completed using the UK Schmidt Telescope at the AAO. In addition, we have recently started a similar, CCD-based survey of the northern ...
  • Fortney, J.J.; Nutzman, P.; Miller, N.; Demory, B.-O.; Seager, S.; Désert, J.-M.; Buchhave, L.A.; Charbonneau, D.; Fressin, F.; Latham, D.W.; Geary, J.C.; Rowe, J.; Caldwell, D.A.; Jenkins, J.M.; Christiansen, J.L.; Marcy, G.W.; Isaacson, H.; Howard, A.; Knutson, H.A.; Buchhave, L.A.; Ciardi, D.; Gautier, T.N.; Batalha, N.M.; Bryson, S.T.; Howell, S.B.; Borucki, W.J.; Koch, D.; Lissauer, J.J.; Haas, M.R.; Everett, M.; Deming, D.; Brown, T.M.; Ford, E.B.; Gilliland, R.L.; Fischer, D.A.; Still, M.; Lucas, P.W.; Gillon, M. (2011-11-01)
    We report the discovery of planet Kepler-12b (KOI-20), which at 1.695 ± 0.030 R is among the handful of planets with super-inflated radii above 1.65 R. Orbiting its slightly evolved G0 host with a 4.438 day period, this ...
  • Smith, Leigh; Lucas, P.W.; Peña, C. Contreras; Kurtev, R.; Marocco, Federico; Jones, H.R.A.; Beamin, J.C.; Napiwotzki, Ralf; Borissova, J.; Burningham, B.; Faherty, J.; Pinfield, D.J.; Gromadzki, M.; Ivanov, V.D.; Minniti, D.; Stimson, W.; Villanueva, V. (2015-12-21)
    We report the discovery of an L dwarf companion to the A3V star β Circini. VVV J151721.49−585131.5, or β Cir B, was identified in a proper motion and parallax catalogue of the VISTA Variables in the Vía Láctea survey as ...
  • Ouchi, Masami; Ono, Yoshiaki; Egami, Eiichi; Saito, Tomoki; Oguri, Masamune; McCarthy, Patrick J.; Farrah, Duncan; Kashikawa, Nobunari; Momcheva, Ivelina; Shimasaku, Kazuhiro; Nakanishi, Kouichiro; Furusawa, Hisanori; Akiyama, Masayuki; Dunlop, James S.; Mortier, Angela M. J.; Okamura, Sadanori; Hayashi, Masao; Cirasuolo, Michele; Dressler, Alan; Iye, Masanori; Jarvis, M.J.; Kodama, Tadayuki; Martin, Crystal L.; McLure, Ross J.; Ohta, Kouji; Yamada, Toru; Yoshida, Michitoshi (2009-05-10)
    We report the discovery of a giant Lyα emitter (LAE) with a Spitzer/Infrared Array Camera (IRAC) counterpart near the reionization epoch at z = 6.595. The giant LAE is found from the extensive 1 deg2 Subaru narrowband ...
  • Britt, C. T.; Maccarone, T. J.; Green, J. D.; Jonker, P. G.; Hynes, R. I.; Torres, M. A. P.; Strader, J.; Chomiuk, L.; Salinas, R.; Lucas, P.; Pena, C. Contreras; Kurtev, R.; Heinke, C.; Smith, L.; Wright, N. J.; Johnson, C.; Steeghs, D.; Nelemans, G. (2016-08-11)
    We report the detection of an infrared selected transient which has lasted at least 5 years, first identified by a large mid-infrared and optical outburst from a faint X-ray source detected with the Chandra X-ray Observatory. ...
  • Swinbank, A.M.; Edge, A.C.; Smail, I.; Stott, J.P.; Bremer, M.; Sato, Y.; van Breukelen, C.; Jarvis, M.J.; Waddington, I.; Clewley, L.; Bergeron, J.; Cotter, G.; Dye, S.; Geach, James; Gonzalez-Solares, E.; Hirst, P.; Ivison, R.J.; Rawlings, S.; Simpson, C.; Smith, G.P.; Verma, A.; Yamada, T. (2007)

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