Now showing items 41-60 of 7545

    • Nore, C.; Brachet, E.; Cerda, E.; Tirapegui Zurbano, Enrique (1994-04-18)
      The simplest interaction between sound and quantized superfluid vortices is investigated both analytically in the Born approximation and numerically, using the nonlinear Schrodinger equation. Compared with the scattering ...
    • Peña, M.; Torres Peimbert, S.; Peimbert, M.; Ruiz González, María Teresa; Maza Sancho, José (1994-06-10)
      Optical and spectrophotometric ata, gathered in the 1987-1994 interval, are presented for the planetary nebula N66 (WS 35 or SMP 83) in the Large Magellanic Cloud. These data show that the central star has suffered dramatic ...
    • Garay Brignardello, Guido; Lizano, Susana; Gómez, Yolanda (1994-07-01)
      We present H92alpha radio recombination line and radio continuum observations toward three cometary-like H II regions, G13.87 + 0.28, G32.80 + 0.19B, and G61.48 + 0.09B1, with an angular resolution of approximately 2''. ...
    • Rodríguez, L. F.; Garay Brignardello, Guido; Curiel, S.; Ramírez, Solange; Torrelles, J. M.; Gómez, Y.; Velásquez, A. (UNIV CHICAGO PRESS, 1994-07-20)
      At angular resolution of approximately 1 arc second(s) the Cepheus A East Radio source is known to consist of 16 compact components clustered within a 25 arc second(s) radius region, most of which are aligned in stringlike ...
    • Schmidt, Brian P.; Kirshner, Robert P.; Eastman, Ronald G.; Phillips, Mark M.; Suntzeff, Nicholas B.; Hamuy Wackenhut, Mario; Maza Sancho, José; Avilés, Roberto (UNIV CHICAGO PRESS, 1994-09-01)
      We have used observations gathered at CTIO to measure distances by the expanding photosphere method (EPM) to five Type II supernovae. These supernovae lie at redshifts from cz = 1100 km s-1 to cz - 5500 km s-1, and increase ...
    • Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Love, W. G. (1994-11)
      We investigate the role of the full dynamical dependence of the free off-shell nucleon-nucleon t matrix on the optical potential for proton-nucleus elastic scattering in the 100—400 MeV incident energy range within a ...
    • Hamuy Wackenhut, Mario; Phillips, M. M.; Maza Sancho, José; Suntzeff, Nicholas B.; Della Valle, Massimo; Danzinger, J.; Antezana, Roberto; Wischnjewsky, M.; Avilés, Roberto; Schommer, Robert A.; Kim, Y. C.; Wells, Lisa A.; Ruiz González, María Teresa; Prosser, Charles F.; Krzeminski, W.; Baylin, Charles D.; Hartigan, Patrick; Hughes, Joanne (1994-12)
      We present spectroscopic and photometric data for SN 1992K, a Type Ia event found in the course of the Calan/Tololo supernova survey. These data show an impressive similarity with the spectra and light curves of the atypical ...
    • Boys Mardones, Daphne; Araya Maturana, Ramiro; Gonzáles Campos, Oscar Cesar; Manríquez Castro, Víctor (1995)
      The crystal structure of the title phosphonium salt consists of a tetrahedral (C6Hs)P +C(C4HS)- (COOCH2CH3) cation and a Br- anion. The triphenylphosphonium group has P---C(phenyl) distances which are equal within ...
    • Hamuy Wackenhut, Mario; Phillips, M. M.; Maza Sancho, José; Suntzeff, Nicholas B.; Schommer, R. A.; Avilés, R. (1995-01)
      We have constructed Hubble diagrams in B and V for 13 Type Ia supernovae (SNe Ia) found in the course of the Calan/Tololo survey covering an unprecedented range in redshift (0.01 less than Z less than 0.1). As opposed to ...
    • Peña, M.; Peimbert, M.; Torres Peimbert, S.; Ruiz González, María Teresa; Maza, J. (1995-03-01)
      Optical and UV spectrophotometric data for the planetary nebula N66 in the Large Magellanic Cloud gathered in the 1987-1994 interval are analyzed. The central star, which had a featureless weak continuum, has developed ...
    • Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Love, W. G. (AMERICAN PHYSICAL SOC, 1995-07)
      We develop an approach for incorporating both medium and off-shell effects in the calculation of full-folding nucleon-nucleus optical potentials for elastic scattering. The approach is based on a flexible scheme for ...
    • Gómez, Yolanda; Garay Brignardello, Guido; Lizano, Susana (The American Astronomical Society, 1995-11-10)
      We present observations of the (J, K) = (2, 2) and (3, 3) inversion transitions of ammonia, made at ˜4" resolution with the VLA, in the direction of the G32.80 + 0.19 and G61.48 + 0.09 star-forming regions, which contain ...
    • Walgraef, D.; Lauzeral, J. (1996)
      A general theory for the spatial ordering of immobile clustered defects in irradiated materials is presented here. A vectorial form for the Fourier transforms of perturbations in the concentration of point and clustered ...
    • Garay Brignardello, Guido; Ramírez, Solange; Rodríguez, Luis F.; Curiel, Salvador; Torelles, José M. (1996-03-01)
      We present multifrequency, matching-beam, VLA radio continuum observations of the Cep A East radio source, known to consist of 16 compact ( 1") components clustered within a 25" radius region, most of which are aligned in ...
    • Szkody, P.; Silber, Andrew; Sion, Ed; Downes, Ronald A.; Howell, Steve B.; Costa Hechenleitner, Edgardo; Moreno, H. (1996-06)
      We present optical spectra from 3 to 21 days and lUE spectra at 10 and 19 days following the outburst of the extreme amplitude, very short orbital period cataclysmic variable AL Corn after a 20 yr quiescent interval. The ...
    • Rodriguez-Ardila, A.; Pastoriza, M. G.; Bica, Eduardo; Maza Sancho, José (American Astronomical Society, 1996-06)
      We study optical spectra in high and low activity states of the faint, distant Seyfert 1 galaxy C16.16. A strong stellar population contribution to the continuum is observed, even in the high-state spectrum. The low- ...
    • Leibundgut, B.; Schommer, R.; Phillips, M. M.; Riess, A.; Schmidt, B.; Spyromilio, J.; Walsh, J.; Suntzeff, Nicholas B.; Hamuy Wackenhut, Mario; Maza Sancho, José; Kirshner, R. P.; Challis, P.; Garnavich, P.; Smith, R. C.; Dressler, A.; Ciardullo, R. (The American Astronomical Society, 1996-07-20)
      The light curve of a distant Type Ia supernova acts like a clock that can be used to test the expansion of the universe. SN 1995K, at a spectroscopic redshift of z = 0.479, provides one of the first meaningful data sets ...
    • Rubio López, Mónica; Lequeux, J.; Boulanger, Francois; Booth, Roy S.; Garay Brignardello, Guido; de Graauw, Th.; Israel, F. P.; Johansson, L.E.B.; Kutner, M.L.; Nyman, L. A. (1996-08)
      We present further results of fully-sampled observations in the J = 1!0 and J = 2!1 rotational transitions of 12CO and 13CO, obtained with the SEST telescope at 43 00 or 22 00 resolution, toward the Small Magellanic Cloud. ...
    • Lizano, Susana; Cantó, Jorge; Garay Brignardello, Guido; Hollenbach, David (UNIV CHICAGO PRESS., 1996-09-10)
      We model the dynamics of a fast, isothermal ionized stellar wind loaded with mass injected from photoevaporated globules surrounding the massive star. The effect of the mass injection is to produce a density profile such ...
    • Prado Fiedler, Roberto; Fuenzalida, Humberto A. (1996-10)
      A tmosphericco ncentratioinn them arineb oundarlya yera ndd irectd epositiomn easurements of totaln itratea nda mmoniumfo r an easternS outhP acificc oastasl iten earV alparaisoC, hile,w ere carriedo utd uringt hep eriodJ ...