Browsing by Issue Date Artículos de revistas

Now showing items 21-40 of 7550

    • PROPER-MOTION SURVEY .1. COMMON-PROPER-MOTION SYSTEMS IN ESO AREAS 439 AND 440 
      Ruiz González, María Teresa; Maza Sancho, José (AMER INST PHYSICS, 1990-03)
    • Role of nuclear densities in nucleon elastic scattering 
      Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Love, W. G. (1990-08)
      A framework based on a full-folding model of the nucleon optical potential is presented for studying nuclear densities of closed-shell nuclei using intermediate energy nucleon scattering. Using a density-matrix expansion ...
    • ENERGY-DISTRIBUTION OF LOW-LUMINOSITY STARS 
      Ruiz González, María Teresa; Anguita, Claudio; Maza Sancho, José; Roth, Miguel (AMER INST PHYSICS, 1990-10)
    • The compact molecular core toward G34.3 + 0.2 - VLA observations in the (2,2) and (3,3) lines of ammonia 
      Garay Brignardello, Guido; Rodríguez, Luis F. (1990-10-10)
      The VLA was used to map the NH3 emission in the lines of the (J,K) = (2,2) and (J,K) = (3,3) inversion transitions toward the warm molecular cloud associated with the compact H II region G34.3 + 0.2. The main HF line of ...
    • The optical light curves of SN 1980N and SN 1981D in NGC 1316 (Fornax A) 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Maza Sancho, José; Wischnjewsky, Marina; Uomoto, Alan; Landolt, Arlo U.; Khatwani, Rani (1991)
      We present optical photometry of the two supernovae, 1980N and 1981D, which appeared in the peculiar D-type galaxy NGC 1316 (Fornax A). These data are combined with published observations to produce definitive optical light ...
    • A (C-12)O survey of the Small Magellanic Cloud 
      Rubio López, Mónica; Garay Brignardello, Guido; Montani, J.; Thaddeus, P. (1991-02-10)
      The central 2 arcsec x 2 arcsec region of the SMC has been fully surveyed to search for (C-12)O emission in the J = 1-0 transition. (C-12)O emission from two large complexes located in the southwest and northeast regions ...
    • Comparison of nucleon-nucleon potential models in a full-folding description of elastic scattering 
      Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Love, W. G.; Nakayama, K. (1991-04)
      The sensitivity of proton-nucleus elastic scattering to different nucleon-nucleon effective interactions is studied within the framework of the nonrelativistic full-folding model. Calculations of the nucleon-nucleus ...
    • Multifrequency VLA observations of radio continuum from IRAS 16293-2422 
      Estalella, R.; Anglada Escudé, Guillem; Rodríguez, L. F.; Garay Brignardello, Guido (1991-04-20)
      Using the VLA at 20, 6, 2, and 1.3 cm, we observed the cold infrared source IRAS 16293-2422. Our data allow a determination of the spectral indices of the components A and B. IRAS 16293-2422A, which is known from higher ...
    • Starting energy dependence of elastic scattering observables in a full-folding model 
      Arellano Sepúlveda, Hugo; Love, W. G.; Brieva Rodríguez, Francisco (1991-06)
      Full-folding model calculations of proton elastic scattering at intermediate energy made using the free off-shell NNt matrix and including the variation of the energy in the NN center of mass as prescribed by the ...
    • The dense molecular envelope around the compact H II region G5.89 - 0.39 (W28 A2) 
      Gómez, Yolanda; Rodríguez, Luis F.; Garay Brignardello, Guido; Moran, James M. (The American Astronomical Society, 1991-08-20)
      VLA observations of ammonia in the (J, K) = (2, 2) and (3, 3) inversion transitions toward the compact H II region G5.89 - 0.39 are presented. These observations reveal the presence of a massive and hot molecular envelope ...
    • A proper motion survey. I. hyades and UMa moving groups 
      Méndez Bussard, René Alejandro; Ruiz González, María Teresa; Maza Sancho, José; Wischnjewsky, M. (1992-03)
      We analyze the results of a proper motion survey in a couple of ESO R 5° X 5° fields, finding evidence for faint (and primarily red) members of the Hyades and UMa moving groups. By the velocity ellipsoid of the Hyades and ...
    • Red supergiants in the southern Milky Way. I - Search and classification techniques 
      MacConnell, D. Jack; Wing, Robert F.; Costa Hechenleitner, Edgardo (American Astronomical Society, 1992-08)
      A detailed description of a continuing survey for distant, cool supergiants near the Galactic plane in the southern hemisphere is presented. Candidate stars are found on near-IR objective-prism plates, and confirming ...
    • Hermitian quadratic eigenvalue problems of restricted rank 
      Conca Rosende, Carlos; Puschmann, Heinrich (1993)
      we consider a quadratic eigenvalue problem such that the second order term is a Hermitian matrix of rank r, the linear term is the identity matrix, and the constant term is an arbitrary Hermitian matrix A E cnn. Of the ...
    • SN 1991bg - A type IA supernova with a difference 
      Leibundgut, Bruno; Kirshner, Robert P.; Phillips, Mark M.; Wells, Lisa A.; Suntzeff, Nicholas B.; Hamuy Wackenhut, Mario; Schommer, R. A.; Walker, A. R.; Gonzalez, L.; Ugarte, P.; Williams, R. E.; Williger, G.; Gómez, Mercedes; Marzke, Ronald; Schmidt, Brian P.; Whitney, Barbara; Coldwell, Nelson; Peters, J.; Chaffee, F. H.; Foltz, Craig B.; Rehner, D.; Siciliano, L.; Barnes, T. G.; Cheng, K. P.; Hintzen, P. M. N.; Kim, Y. C.; Maza Sancho, José; Parker, J. Wm.; Porter, A. C.; Schmidtke, P. C.; Sonneborn, George (American Astronomical Society, 1993-01)
      We present 13 spectra and 31 photometric observations covering the first 150 days of SN 1991bg in NGC 4374 (M 84). Although SN 1991bg was a type Ia supernova displaying the characteristic Si II absorption at 6150 angstrom ...
    • Compact ammonia sources toward the G10.5 + 0.0 H II region complex 
      Garay Brignardello, Guido; Moran, James M.; Rodríguez, Luis F. (1993-08-20)
      We present observations of the (2, 2) and (3, 3) inversion transitions of ammonia toward a group of compact H II regions near l = 10-degrees.5, b = 0-degrees.0, made at 4'' resolution using the VLA. We detected three ...
    • THE 1990 CALAN TOLOLO SUPERNOVA SEARCH 
      Hamuy Wackenhut, Mario; Maza Sancho, José; Phillips, M. M.; Suntzeff, Nicholas B.; Wischnjewsky, M.; Smith, R. C.; Antezana, Roberto; Wells, L. A.; González, L. E.; Gigoux, P.; Navarrete, M.; Barrientos, F.; Lamontagne, R.; Della Valle, Massimo; Elias, J. E.; Phillips, A. C.; Odewahn, S. C.; Baldwin, J. A.; Walker, A. R.; Williams, T.; Sturch, C.; Baganoff, F. K.; Chaboyer, Brian; Schommer, R. A.; Tirado, H.; Hernández, M.; Ugarte, P.; Guhathakurta, P.; Howell, S. B.; Szkody, P.; Schmidtke, P. C.; Roth, J. (AMER INST PHYSICS, 1993-12)
      We have started a search for supernovae as a collaboration between the University of Chile and the Cerro Tololo Inter-American Observatory, with the aim of producing a moderately distant (0.01 < z < 0.10) sample of Type ...
    • PROPER MOTIONS IN THE SOUTHERN ESO AREA-207, AREA-439, AND AREA-440 
      Ruiz González, María Teresa; Takamiya, Marianne Y.; Méndez Bussard, René Alejandro; Maza Sancho, José; Wishnjewsky, Marina (AMER INST PHYSICS, 1993-12)
    • Approximation of Young measures by functions and application to a problem of optimal design for plates with ... 
      Bonnetier, E.; Conca Rosende, Carlos (1994)
      Given a parametrised measure and a family of continuous functions (<pn), we construct a sequence of functions (uk) such that, as fc-> co, the functions fn(uk) converge to the corresponding moments of the measure, in the ...
    • THE EXPANDING PHOTOSPHERE METHOD APPLIED TO SN-1992AM AT CZ=14600KM-S 
      Schmidt, Brian P.; Kirshner, Robert P.; Eastman, Ronald G.; Hamuy Wackenhut, Mario; Phillips, Mark M.; Suntzeff, Nicholas B.; Maza Sancho, José; Filippenko, Alexei V.; Ho, Luis C.; Matheson, Thomas; Grashuis, Randy; Aviles, Roberto; Kirkpatrick, J. Davy; Challis, Peter; Kuijken, Konrad; Zucker, Daniel; Bolte, Michael; Tyson, Neil D. (AMER INST PHYSICS, 1994-04)
      We present photometry and spectroscopy of SN 1992am for five months following its discovery by the Calan/CTIO SN search. These data show SN 1992am to be type II-P, displaying hydrogen in its spectrum and the typical shoulder ...
    • SN 1992bc and SN 1992bo: Evidence for intrinsic differences in type IA supernova luminosities 
      Maza Sancho, José; Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Avilés, R. (UNIV CHICAGO PRESS, 1994-04-01)
      Based on the two best-observed Type Ia supernovae found in the Calan/Tololo Supernova Search, in this Letter we present convincing evidence that Type la supernovae with a fast rate of decline in the B band are intrinsically ...