Browsing by Title Facultad de Ciencias Físicas y Matemáticas

Now showing items 20336-20355 of 20505

    • Vínculos entre relaciones de contacto y variogramas de indicadores para el modelamiento de variables categóricas 
      Sucapuca Pacara, Leslie Elizabeth (Universidad de Chile, 2017)
      Diversos modelos geoestadísticos permiten simular tipos de roca o, más generalmente, unidades geológicas en los yacimientos, entre los cuales se cuenta el modelo de simulación plurigaussiana y el de simulación secuencial ...
    • VLA and BIMA observations toward the exciting source of the massive HH 80-81 outflow 
      Gómez, Y.; Rodríguez, L. F.; Girart, J.M.; Garay Brignardello, Guido; Martí, J. (The American Astronomical Society, 2003-11-01)
      We present high angular resolution Very Large Array (VLA) and Berkeley-Illinois-Maryland Association (BIMA) observations of NH3, HCO+, HCN, and SO molecular emission and 1.4, 3.5, and 7 mm continuum emission toward the ...
    • Vla observations of carbon radio recombination lines toward the H II region complex S88B 
      Garay Brignardello, Guido; Gómez, Yolanda; Lizano, Susana; Brown, Robert L. (1998-07-10)
      We present high angular resolution VLA observations of the C92a, C110a, and C166a radio recombination lines of carbon from the region of massive star formation known as S88B. The observations reveal that the carbon ...
    • VLBA DETERMINATION OF THE DISTANCE TO NEARBY STAR-FORMING REGIONS. V. DYNAMICAL MASS, DISTANCE, AND RADIO ... 
      Torres, Rosa M.; Loinard, Laurent; Mioduszewski, Amy J.; Boden, Andrew F.; Franco Hernández, Ramiro; Vlemmings, Wouter H. T.; Rodríguez, Luis F. (2012-01-01)
      We present multi-epoch Very Long Baseline Array (VLBA) observations of V773 Tau A, the 51 day binary subsystem in the multiple young stellar system V773 Tau. Combined with previous interferometric and radial velocity ...
    • VLT spectroscopic analysis of HH 202. Implications on dust destruction and thermal inhomogeneities 
      Espíritu, José; Peimbert, Antonio; Delgado-Inglada, Gloria; Ruiz, Mara (Universidad Nacional Autonoma de Mexico, 2017)
      We present a long-slit spectroscopic analysis of Herbig-Haro 202 and the surrounding gas of the Orion Nebula using data from the Very Large Telescope3. We determined the spatial variation of its physical conditions and ...
    • VLT spectroscopy of galaxies lensed by the AC 114 cluster: Implications for the mass model and the study ... 
      Campusano, Luis E.; Pelló, R.; Kneib, J. P.; Le Borgne, J. F.; Fort, B.; Ellis, R.; Mellier, Y.; Smail, I. (2001-11)
      We present the first results of a spectroscopic survey of faint lensed galaxies in the core of the galaxy cluster AC114 (z = 0.312) obtained from observations with the FORS1 spectrograph mounted on the VLT-Antu (Unit ...
    • VLT-UVES abundance analysis of four giants in NGC 6553 
      Alves Brito, A.; Barbuy, B.; Zoccali, Manuela; Minniti, D.; Ortolani, S.; Hill, V.; Renzini, A.; Pasquini, L.; Bica, E.; Rich, R. M.; Meléndez, J.; Momany, Y. (EDP SCIENCES S A, 2006-12)
      Context. Metal-rich globular clusters trace the formation of bulges. Abundance ratios in the metal-rich globular clusters such as NGC 6553 can constrain the formation timescale of the Galactic bulge. Aims. The purpose of ...
    • The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits III. The ... 
      Reggiani, M.; Meyer, M.; Chauvin, G.; Vigan, A.; Quanz, S.; Biller, B.; Bonavita, M.; Desidera, S.; Delorme, P.; Hagelberg, J.; Maire, Anne-Lise; Boccaletti, A.; Beuzit, J.; Buenzli, E.; Carson, J.; Covino, E.; Feldt, M.; Girard, J.; Gratton, R.; Henning, Thomas; Kasper, M.; Lagrange, A.; Mesa, D.; Messina, S.; Montagnier, G.; Mordasini, C.; Mouillet, D.; Schlieder, J.; Segransan, D.; Thalmann, C.; Zurlo, A. (EDP SCIENCES, 2016)
      Context. In recent years there have been many attempts to characterize the occurrence and distribution of stellar, brown dwarf (BD), and planetary-mass companions to solar-type stars with the aim of constraining formation ...
    • VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B 
      Maire, A.-L.; Rodet, L.; Lazzoni, C.; Boccaletti, A.; Brandner, W.; Galicher, R.; Cantalloube, F.; Mesa, D.; Klahr, H.; Beust, H.; Chauvin, G.; Desidera, S.; Janson, M.; Keppler, M.; Olofsson, J.; Augereau, J. -C.; Daemgen, S.; Henning, Thomas; Thebault, P.; Bonnefoy, M.; Feldt, M.; Gratton, R.; Lagrange, Anne Marie; Langlois, M.; Meyer, M. R.; Vigan, A.; D'Orazi, V.; Hagelberg, J.; Coroller, H. Le; Ligi, R.; Rouan, D.; Samland, M.; Schmidt, T.; Udry, S.; Zurlo, A.; Abe, L.; Carle, M.; Delboulbe, A.; Feautrier, P.; Magnard, Y.; Maurel, D.; Moulin, T.; Pavlov, A.; Perret, D.; Petit, C.; Ramos, J. R.; Rigal, F.; Roux, A.; Weber, L. (EDP Sciences, 2018-08-07)
      Context. A low-mass brown dwarf has recently been imaged around HR 2562 (HD 50571), a star hosting a debris disk resolved in the far infrared. Interestingly, the companion location is compatible with an orbit coplanar with ...
    • VLT/SPHERE survey for exoplanets around young early-type stars, including systems with multi-belt architectures 
      Lombart, Maxime; Chauvin, Gael Epely; Rojo Rubke, Patricio; Lagadec, Eric; Delorme, Philippe; Beust, Herve; Bonnefoy, Mickael; Galicher, Raphael; Gratton, Raffaele; Mesa, Dino; Bonavita, Mariangela; Allard, France; Bayo, Alberto; Boccaletti, Anthony; Desidera, Silvano; Girard, Julien; Jenkins, James Stewart; Klahr, H.; Laibe, G.; Lagrange, Anne Marie; Lazzoni, C.; Marleau, Gabriel Dominique; Minniti, Dante; Mordasini, C. (EDP Science, 2020)
      Context. Dusty debris disks around pre- and main-sequence stars are potential signposts for the existence of planetesimals and exoplanets. Giant planet formation is therefore expected to play a key role in the evolution ...
    • VLT/SPHERE- and ALMA-based shape reconstruction of asteroid (3) Juno* 
      Viikinkoski, M.; Kaasalainen, M.; Durech, J.; Carry, B.; Marsset, M.; Fusco, T.; Dumas, C.; Merline, W.; Yang, B.; Berthier, J.; Kervella, Pierre; Vernazza, P. (EDP Sciences, 2015)
      We use the recently released Atacama Large Millimeter Array (ALMA) and VLT/SPHERE science verification data, together with earlier adaptive-optics images, stellar occultation, and lightcurve data to model the 3D shape and ...
    • VLT/UVES observations of extremely strong intervening damped Lyman-alpha systems Molecular hydrogen and ... 
      López Morales, Sebastián (EDP Sciences, 2015)
      We present a detailed analysis of three extremely strong, intervening damped Lyman-α systems (ESDLAs, with log N(H i) ≥ 21.7) observed towards quasars with the Ultraviolet and Visual Echelle Spectrograph on the Very Large ...
    • VLTI/PIONIER images the Achernar disk swell 
      Vedova, G. Dalla; Millour, F.; Souza, A. Domiciano de; Petrov, R. G.; Faes, D. Moser; Carciofi, A. C.; Kervella, Pierre; Rivinius, T. (EDP Sciences, 2017-05)
      Context. The mechanism of disk formation around fast-rotating Be stars is not well understood. In particular, it is not clear which mechanisms operate, in addition to fast rotation, to produce the observed variable ejection ...
    • The VLTI/PIONIER near-infrared interferometric survey of southern T Tauri stars 
      Anthonioz, F.; Ménard, Francois; Pinte, Christophe; Le Bouquin, J. B.; Benisty, Myriam; Thi, W. F.; Absil, Olivier; Duchêne, G.; Augereau, J. C.; Berger, J. P.; Casassus Montero, Simón; Duvert, G.; Lazare, B.; Malbet, F.; Millan Gabet, R.; Schreiber, M. R.; Traub, W.; Zins, G. (EDP Sciences, 2015)
      Context. The properties of the inner disks of bright Herbig AeBe stars have been studied with near-infrared (NIR) interferometry and high resolution spectroscopy. The continuum (dust) and a few molecular gas species have ...
    • VOCALS-CUpEx: the Chilean Upwelling Experiment 
      Garreaud Salazar, René; Rutllant Costa, José; Muñoz Alvarado, Raúl; Rahn, David; Ramos, M.; Figueroa, D. (COPERNICUS GESELLSCHAFT MBH, 2011)
      The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) was a major field experiment conducted in spring of 2008 off southern Peru and northern Chile, aimed at better understanding the coupled climate ...
    • Volatile content implications of increasing explosivity of the strombolian eruptive style along the fracture ... 
      Robidoux, Philippe; Pastén, Daniela; Levresse, Gilles; Díaz, Gloria; Paredes, Dante (MDPI, 2021)
      Potential flank eruptions at the presently active Villarrica, Southern Andes Volcanic Zone (33.3–46 S) require the drawing of a comprehensive scenario of eruptive style dynamics, which partially depends on the degassing ...
    • Volatilidad accionaria y spreads de bonos corporativos bajo distintos niveles de endeudamiento y caja 
      Bórquez Oliva, Diego Fernando (Universidad de Chile, 2019)
      Los factores que afectan los spreads de bonos corporativos han sido ampliamente estudiados. Modelos estructurales de riesgo de crédito predicen que mientras mayor volatilidad accionaria y deuda tenga una firma, mayor es ...
    • Volatilidad global 
      Soto Vásquez, Rodrigo Alejandro (Universidad de Chile, 2020)
      La presente tesis estudia los efectos que tiene la volatilidad global de la tasa de cambio,tasa de interés e inflación sobre el crecimiento y otras variables macroeconómicas. Se sigue la literatura al explorar como la ...
    • Volcanic and Saline Lithium Inputs to the Salar de Atacama 
      Godfrey, Linda; Álvarez Amado, Fernanda (MDPI, 2020)
      The Li-rich brine contained within the halite body of the Salar de Atacama is uncommon for two reasons: First, it has an exceptionally high Li concentration, even compared to other closed basins in the Li triangle of South ...
    • Volcanic lightning and plume behavior reveal evolving hazards during the April 2015 eruption of Calbuco ... 
      Van Eaton, Alexa R.; Amigo, Álvaro; Bertin, Daniel; Mastin, Larry G.; Giacosa, Raúl E.; González, Jerónimo; Valderrama, Óscar; Fontijn, Karen; Behnke, Sonja A. (Amer Geophysical Union, 2016)
      Soon after the onset of an eruption, model forecasts of ash dispersal are used to mitigate the hazards to aircraft, infrastructure, and communities downwind. However, it is a significant challenge to constrain the model ...