Browsing by Issue Date Facultad de Ciencias Físicas y Matemáticas

Now showing items 61-80 of 20266

    • Warm molecular gas associated with cometary Hıı regions 
      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 ...
    • Theory and numerical simulations of defect ordering in irradiated materials 
      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 ...
    • Evidencias de cambios climáticos ocurridos durante el cuaternario en la zona de Antofagasta, II Región 
      Easton Vargas, Gabriel (Universidad de Chile, 1996)
      La zona costera de la Región de Antofagasta, en la cual se ubica la bahía de Antofagasta, se encuentra actualmente sometida a un clima de marcada aridez, caracterizado por una precipitación media anual típica cercana a los ...
    • The Nature of the Radio Sources within the Cepheus A Star-forming Region 
      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 ...
    • IUE and Optical Spectra of AL Comae Berenices During a Rare Superoutburst 
      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 ...
    • The Nucleus of C16.16: Another Case of a Double-peaked Active Galactic Nucleus 
      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- ...
    • Time Dilation In The Light Curve Of The Distant Type Ia Supernova Sn 1995k 
      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 ...
    • Results of the ESO-SEST Key Programme: CO in the Magellanic Clouds. V. Further CO observations of the Small ... 
      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. ...
    • Photoevaporated flows from H II regions 
      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 ...
    • Wet and dry deposition of nitrogen c ompounds in the southeast Pacific coast: Montemar, central Chile 
      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 ...
    • Sensitivity of nuclean-nucleus scattering to the off-shell behavior of on-shell equivalent NN potentials 
      Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Sander, M.; von Geramb, H. V. (AMERICAN PHYSICAL SOC, 1996-11)
      The sensitivity of nucleon-nucleus elastic scattering to the off-shell behavior of realistic nucleon-nucleon interactions is investigated when on-shell equivalent nucleon-nucleon potentials are used. The study is based on ...
    • Sensitivity of nucleon-nucleus scattering to the off-shell behavior of on-shell equivalent NN potentials 
      Arellano Sepúlveda, Hugo; Brieva Rodríguez, Francisco; Sander, M.; von Geramb, H. V. (1996-11)
      The sensitivity of nucleon-nucleus elastic scattering to the off-shell behavior of realistic nucleon-nucleon interactions is investigated when on-shell equivalent nucleon-nucleon potentials are used. The study is based on ...
    • BVRI light curves for 29 type Ia supernovae 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, R. A.; Maza Sancho, José; Antenaza, Roberto; Wischnjewsky, Marina; Valladares, Geraldo; Muena, César; González, L. E.; Avilés, R.; Wells, Lisa; Smith, R. C.; Navarrete, Mauricio; Covarrubias, Ricardo; Williger, G.; Walker, Alistair R.; Layden, A. C.; Elias, J. H.; Baldwin, J. A.; Hernández, Manuel; Tirado, Hernán; Ugarte, Patricio; Elston, R.; Saavedra, Nelson; Barrientos, Felipe; Costa Hechenleitner, Edgardo; Lira Teillery, Paulina; Ruiz González, María Teresa; Anguita, Claudio; Gómez, Ximena; Ortiz Arce, Patricio; Della Valle, Massimo; Danziger, J.; Storm, J.; Kim, Y. C.; Bailyn, C.; Rubenstein, Eric P.; Tucker, D.; Cersosimo, S.; Méndez, R. A.; Siciliano, L.; Sherry, W.; Chaboyer, Brian; Koopmann, R. A.; Geisler, D.; Sarajedini, A.; Dey, Arjun; Tyson, N.; Rich, R. Michael; Gal, R.; Lamontagne, Robert; Caldwell, N.; Guhathakurta, Puragra; Phillips, A. C.; Szkody, P.; Prosser, C.; Ho, Luis C.; McMahan, R.; Baggley, G.; Cheng, K. P.; Havlen, R.; Wakamatsu, K.; Janes, Kenneth A.; Malkan, Mathew; Baganoff, F.; Seitzer, P.; Shara, M.; Sturch, C.; Hesser, J.; Hartigan, P.; Hughes, J.; Welch, D. L.; Williams, T. B.; Ferguson, H.; Francis, P. J.; French, L.; Bolte, M.; Roth, J.; Odewahn, S.; Howell, S.; Krzeminski, W. (American Astronomical Society, 1996-12)
      BV(RI)_KC_ light curves are presented for 27 type Ia supernovae discovered during the course of the Calan/Tololo Survey and for two other SNe Ia observed during the same period. Estimates of the maximum light magnitudes ...
    • BVRI light curves for 29 type Ia supernovae 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, R. A.; Maza Sancho, José; Antenaza, Roberto; Wischnjewsky, Marina; Valladares, Geraldo; Muena, César; González, L. E.; Avilés, R.; Wells, Lisa; Smith, R. C.; Navarrete, Mauricio; Covarrubias, Ricardo; Williger, G.; Walker, Alistair R.; Layden, A. C.; Elias, J. H.; Baldwin, J. A.; Hernández, Manuel; Tirado, Hernán; Ugarte, Patricio; Elston, R.; Saavedra, Nelson; Barrientos, Felipe; Costa Hechenleitner, Edgardo; Lira Teillery, Paulina; Ruiz González, María Teresa; Anguita, Claudio; Gómez, Ximena; Ortiz, P.; Della Valle, M.; Danziger, J.; Storm, J.; Kim, Y. C.; Bailyn, C.; Rubenstein, Eric P.; Tucker, D.; Cersosimo, S.; Méndez Bussard, René Alejandro; Siciliano, L.; Sherry, W.; Chaboyer, Brian; Koopmann, R. A.; Geisler, D.; Sarajedini, A.; Dey, Arjun; Tyson, N.; Rich, R. Michael; Gal, R.; Lamontagne, Robert; Caldwell, N.; Guhathakurta, Puragra; Phillips, A. C.; Szkody, P.; Prosser, C.; Ho, Luis C.; McMahan, R.; Baggley, G.; Cheng, K. P.; Havlen, R.; Wakamatsu, K.; Janes, Kenneth A.; Malkan, Mathew; Baganoff, F.; Seitzer, P.; Shara, M.; Sturch, C.; Hesser, J.; Hartigan, P.; Hughes, J.; Welch, D. L.; Williams, T. B.; Ferguson, H.; Francis, P. J.; French, L.; Bolte, M.; Roth, J.; Odewahn, S.; Howell, S.; Krzeminski, W. (American Astronomical Society, 1996-12)
      BV(RI)_KC_ light curves are presented for 27 type Ia supernovae discovered during the course of the Calan/Tololo Survey and for two other SNe Ia observed during the same period. Estimates of the maximum light magnitudes ...
    • Carbon Stars in the Large Magellanic Cloud: Luminosities, Colors, and Implications for the History of Star ... 
      Costa Hechenleitner, Edgardo; Frogel, Jay A. (1996-12)
      We present RI and JHK photometry for 888 and 204 carbon (C) stars, respectively, of the 1035 C stars found by Blanco and his collaborators in 52 fields of the Large Magellanic Cloud (LMC). The results of our analysis of ...
    • The absolute luminosities of the Calan/Tololo type Ia supernovae 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Schommer, R. A.; Suntzeff, Nicholas B.; Maza Sancho, José; Avilés, Roberto (AMER INST PHYSICS, 1996-12)
      We examine the absolute luminosities of 29 SNe Ia in the Calan/Tololo survey. We confirm a relation between the peak luminosity of the SNe and the decline rate as measured by the light curve, as suggested by Phillips [ApJ, ...
    • The morphology of type Ia supernovae light curves 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, Robert A.; Maza Sancho, José; Smith, R. C.; Lira Teillery, Paulina; Avilés, R. (1996-12)
      We present a family of six BVI template light curves for SNe Ia for days -5 and +80, based on high-quality data gathered at CTIO. These templates display a wide range of light-curve morphologies, with initial decline rates ...
    • The Hubble diagram of the Calan/Tololo type Ia supernovae and the value of H-0 
      Hamuy Wackenhut, Mario; Phillips, M. M.; Suntzeff, Nicholas B.; Schommer, Robert A.; Maza Sancho, José; Avilés, R. (1996-12-06)
      The Calan/Tololo supernova survey has discovered similar to 30 type Ia supernovae at redshifts out to z similar to 0.1. Using BV(I)(KC) data for these objects and nearby SNe Ia, we have shown that there exists a significant ...
    • Jurassic extensional tectono-magmatism and associated mineralization of the El Faldeo polymetallic district, ... 
      Parada Reyes, Miguel; Palacios Monasterio, Carlos; Lahsen Azar, Alfredo (1997)
      The El Faldeo is the southernmost Andean mineral district and consists of Paleozoic polymeta- morphic basement unconformably overlain by a 200 m thick homoclinal sequence of sedimentary and felsic volcanic beds of the ...
    • Recent temperature variations in southern South America 
      Rosenbluth López, Benjamín; Fuenzalida Ponce, Humberto; Aceituno Gutiérrez, Patricio (1997)
      Results from a critical appraisal of surface mean air temperature in Chile and Argentina and extreme air temperature in Chile during the present century are presented. Observations were homogenized to produce a set of ...