Browsing Research and Publications - Department of Physics & Astronomy by Issue Date

Browsing Research and Publications - Department of Physics & Astronomy by Issue Date

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  • Buta, Ronald (201-08-17)
    NGC 4013 is a nearby Sb edge-on galaxy known for its “prodigious” H i warp and its “giant” tidal stream. Previous work on this unusual object shows that it cannot be fitted satisfactorily by a canonical thin+thick disk ...
  • Stern, Allen (American Physical Society, 1977-06-15)
    Classical periodic trajectories are shown to exist for a test particle moving in an external SU(2) gauge field. The field is assumed to be static and of the form proposed by Wu and Yang. The energy of the system is positive, ...
  • Balachandran, A. P.; Borchardt, S.; Chang, S. S.; Stern, Allen; Cahalan, R.; Ramachandran, R.; Rupertsberger, H. (American Physical Society, 1978-02-15)
    We study the analyticity in cosθ of the exact quantum-mechanical electric-charge-magnetic-monopole scattering amplitude by ascribing meaning to its formally divergent partial-wave expansion as the boundary value of an ...
  • Stern, Allen; Balachandran, A. P.; Borchardt, S.; Chang, S. S.; Stern, A.; Cahalan, R.; Ramachandran, R.; Rupertsberger, H. (American Physical Society, 1978-02-15)
    A semiclassical approximation derived directly from the Feynman path integral is employed in the study of electric-charge-magnetic-monopole scattering. We show that this approximation, unlike perturbation theory, is ...
  • Stern, Allen (American Physical Society, 1978-06-15)
  • Balachandran, A. P.; Borchardt, S.; Stern, A. (American Physical Society, 1978-06-15)
    A new Lagrangian L is proposed for the description of a particle with a non-Abelian charge in interaction with a Yang-Mills field. The canonical quantization of L is discussed. At the quantum level L leads to both irreducible ...
  • Buta, Ronald J.; de Vaucouleurs, G. (American Astronomical Society, 1978-11)
    The density distribution of globular clusters in the Galaxy derived from the Kukarkin catalog obeys the R^1/4 law in projection on the YZ plane: logσ(R)=3.303-2.587R^1/4 over the whole range of distances (R <50 kpc), with ...
  • Balachandran, A. P.; Stern, Allen; Trahern, G. (American Physical Society, 1979-04-15)
    In the usual formulation of nonlinear models (such as chiral models), there is invariance under a nonlinear realization of a group GF which becomes linear when restricted to a subgroup HF. We formulate them so that they ...
  • Balachandran, A. P.; Stern, Allen; Skagerstam, B. S. (American Physical Society, 1979-07-15)
    Equations of motion and the Lagrangian formalism for extended objects coupled to Abelian and non-Abelian gauge fields are developed. These equations are minimal generalizations of the corresponding equations for point ...
  • Buta, Ronald; M. Smith (1979-08)
    The nonradial pulsator 53 Persei (B4.5 V) has been observed during 13 nights in late 1977 to determine whether its photometric variations are reminiscent of its spectral line profile changes. Inspection of the resulting ...
  • Buta, Ronald (1979-09)
    Various theoretical constraints are imposed on simultaneous light, color, and line profile observations to identify the surface indices of two nonradial modes present in the line profile variable B star 53 Persei during ...
  • Buta, Ronald J.; de Vaucouleurs, G. (American Astronomical Society, 1980-06)
    A catalog of major and minor diameters of nuclei, lenses, and inner and outer rings in 532 bright galaxies measured on large-scale reflector plates and listed in the first Reference Catalogue of Bright Galaxies is assembled ...
  • Buta, Ronald J.; McCall, M. L.; Uomoto, A. K. (American Astronomical Society, 1980-10)
    Photometric and spectroscopic data have been acquired for a small nebulous blue object near the heavily obscured galaxy Maffei 1. The observations show that the object is a galactic reflection nebula illuminated by an ...
  • Buta, Ronald (1980-12)
    Inner ring structures are observed in about one quarter of all lenticular or spiral galaxies. Statistics of the relative frequencies of the pure ring (r) and broken ring (rs) varieties in the Second Reference Catalogue ...
  • Buta, Ronald J.; de Vaucouleurs, G.; de Vaucouleurs, A. (1981-10)
    The integrated magnitudes and colors of 163 DDO "dwarf" galaxies in the UBV system are derived from 542 photoelectric observations with four telescopes between 1976 and 1980. Total (asymptotic) magnitude B_T, mean color ...
  • Buta, Ronald J.; Falk, S. W.; McCall, M. L.; Sutherland, P. G.; Uomoto, A.; Wheeler, J. C.; Wills, B. J.; Branch, D. (1982-01)
    A high quality optical spectrum of the 1981 Type I supernova in NGC 4536 at maximum light is well represented by a synthetic spectrum consisting of resonance scattering lines of Ca_II, Si_II, S_II, Mg_II, and O_I, superposed ...
  • Buta, Ronald (1982-02)
    The linear diameters D_r of the inner ring (r) and pseudo-ring (rs) structures in spiral galaxies of different morphological types and stage Sab to Sd (2 ≤ T ≤ 7) in the revised Hubble system are calibrated by means of ...
  • Skagerstam, B. -S.; Stern, Allen (American Physical Society, 1982-03-15)
    In a previous work the dynamics of relativistic extended objects (i.e., strings, shells, etc.) coupled to Abelian or non-Abelian gauge fields was developed. The extended objects possessed an electriclike current which was ...
  • Balachandran, A. P.; Stern, Allen (American Physical Society, 1982-09-15)
    A finite number of nonlocal conservation laws are found in the Nambu-Goto string model. An infinite number of conserved currents may be obtained by embedding the string in more than 3 + 1 space-time dimensions. These ...
  • Nandi, S.; Stern, Allen; Sudarshan, E. C. G. (American Physical Society, 1982-10-15)
    We show that for all SO(n), n>10, family unification schemes there exist no gauge currents relevant for baryon decay other than those already appearing in the SO(10) model. The effect of Yukawa interactions for ...

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