Navegação Ciências Exatas e da Terra por Autor "Dottori, Horacio Alberto"

Resultados 41-60 de 63

    • Photometric procedure for quantitative analysis of aflatoxin b1 in peanuts by thin-layer chromatography using charge coupled device detector 

      Hoeltz, Michele; Welke, Juliane Elisa; Noll, Isa Beatriz; Dottori, Horacio Alberto (2010) [Artigo de periódico]
      A photometric procedure was developed for determination of aflatoxin B1 in peanuts by TLC-CCD technique. The quantification and detection limit were 1.2 μg kg-1 and 0.4 ng per spot, respectively, with mean recovery of 98%. ...

    • Photometry and kinematics of two minor merger candidate galaxies 

      Gimeno, Germán; Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Rodrigues, Irapuan; Carranza, Gustavo Jose (2007) [Artigo de periódico]
      We observationally investigate the properties of disk galaxies undergoing minor merger or capture events. In this context, the properties of two double-nucleus candidate galaxies, ESO 381–IG23 andMCG 3-35-14, are analyzed. ...

    • Properties of young star cluster systems : the age signature from near-infrared integrated colours 

      Santos Junior, Joao Francisco Coelho dos; Dottori, Horacio Alberto; Grosbol, Preben (2013) [Artigo de periódico]
      Context. A recent JHKs study of several grand-design spiral galaxies, including NGC 2997, shows a bimodal distribution of their system of star clusters and star forming complexes in colour-magnitude and colour-colour ...

    • A search for old star clusters in the large magellanic cloud 

      Geisler, Doug; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto; Claria Olmedo, Juan Jose; Piatti, Andres E.; Santos Junior, Joao Francisco Coelho dos (1997) [Artigo de periódico]
      There are only a handful of known star clusters in the LMC that are genuinely old, i.e., of similar age to the globular star clusters in the Milky Way. We report the first results of a color-magnitude diagram survey of 25 ...

    • Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 

      Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Carranza, Gustavo Jose; Lipari, Sebastian; Santos Junior, Joao Francisco Coelho dos (2005) [Artigo de periódico]
      The Seyfert 2 galaxy NGC 1241 presents a 1.5 kpc large circumnuclear ring (CNR) of star formation embracing a small bar plus leading arms. Those structures are Paα emitters but barely seen in Haα. It also presents stellar ...

    • Spatial distributions of young Large Magellanic Cloud clusters and tracers of a bar pertubation 

      Dottori, Horacio Alberto; Bica, Eduardo Luiz Damiani; Claria Olmedo, Juan Jose; Puerari, Ivanio (1996) [Artigo de periódico]
      The spatial distributions of SWB I [10<~t(Myr)30]<~ and SWB II [30<~t(Myr)<~70] LMC clusters are analyzed using the enlarged sample of integrated V BV photometry of star clusters and associations published by Bica et ai. ...

    • Star formation in grand-design, spiral galaxies : young, massive clusters in the near-infrared 

      Grosbol, Preben; Dottori, Horacio Alberto (2012) [Artigo de periódico]
      Aims. Spiral structure is a prominent feature in many disk galaxies and is often outlined by bright, young objects. We study the distribution of young stellar clusters in grand-design spiral galaxies and thereby determine ...

    • Star-forming knots and density wave in NGC 2997 

      Grosbol, Preben; Dottori, Horacio Alberto; Gredel, Roland (2006) [Artigo de periódico]
      Context. Many grand design spiral galaxies show strings of bright knots along their arms on near-infrared K-band images. The alignment of such knots suggests a relation to the spiral pattern and possibly to a large-scale, ...

    • Statistics of stellar populations of star clusters and surrounding fields in the outer disk of the Large Magallanic Cloud 

      Santos Junior, Joao Francisco Coelho dos; Piatti, Andres E.; Claria Olmedo, Juan Jose; Bica, Eduardo Luiz Damiani; Geisler, Doug; Dottori, Horacio Alberto (1999) [Artigo de periódico]
      A comparative analysis of Washington color-magnitude diagrams (CMDs) for 14 star clusters and respective surrounding fields in the Large Magellanic Cloud (LMC) outer disk is presented. Each CCD frame including field and ...

    • Statistics of young starforming complexes in spiral galaxies using NIR photometry 

      Grosbol, Preben; Dottori, Horacio Alberto (2008) [Artigo de periódico]
      Aims. Very young stellar clusters and cluster complexes may be embedded in dust lanes along spiral arms in disk galaxies and escape detection in visual bands. Observations in the near-infrared K-band offer an almost unbiased ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. IX. Ultraviolet observations of Fairall 9 

      Rodriguez-Pascual, P.M.; Alloin, Danielle Marie; Clavel, J.; Crenshaw, Daniel Michael; Horne, Keith; Kriss, Gerard A.; Krolik, J.H.; Malkan, M.A.; Netzer, Hagai; O'Brien, P.T.; Peterson, Bradley M.; Reichert, G.A.; Wansteker, W.; Alexander, T.; Barr, P.; Blandford, R.D.; Bregman, J.N.; Carone, T.E.; Clements, S.; Courvoisier, T.-J.; De Robertis, M.M.; Dietrich, Matthias; Dottori, Horacio Alberto; Edelson, Rick A.; Filippenko, Alexei V.; Gaskell, C.M.; Huchra, John P.; Hutchings, John B.; Kollatschny, W.; Koratkar, A.P.; Korista, Kirk T.; Laor, A.; Macalpine, G.M.; Martin, P.G.; Maoz, D.; Mccollum, B.; Morris, S.L.; Perola, G.C.; Pogge, Richard William; Ptak, R.L.; Recondo-Gonzalez, M.C.; Rodríguez Espinosa, Jose Miguel; Rokaki, E.L.; Santos-Lleo, M.; Sekiguchi, Kazuhiro; Shull, John Michael; Snijders, M.A.J.; Sparke, L.S.; Stirpe, Giovanna M.; Stoner, R.E.; Sun, W.-H.; Wagner, S.J.; Wanders, I.; Wilkes, B.J.; Winge, Claudia; Zheng, W. (1997) [Artigo de periódico]
      An 8 month monitoring campaign on the Seyfert 1 galaxy Fairall 9 has been conducted with the International Ultraviolet Explorer in an attempt to obtain reliable estimates of continuum-continuum and continuumÈemission-line ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VI. Variability of NGC 3783 from ground-based data 

      Stirpe, Giovanna M.; Winge, Claudia; Altieri, B.; Alloin, Danielle Marie; Aguero, E.L.; Anupama, G.C.; Ashley, R.; Bertram, R.; Calderon, J.H.; Catchpole, R.M.; Corradi, R.L.M.; Covino, E.; Dottori, Horacio Alberto; Feast, M.W.; Ghosh, K.K.; Hutton, R. Gil; Glass, I.S.; Grebel, Eva K.; Jorda, L.; Koen, C.; Laney, C.D.; Maia, Marcio Antonio Geimba; Marang, Fred; Mayya, Y.D.; Morrell, Nidia; Nakada, Y.; Pastoriza, Miriani Griselda; Pati, A.K.; Pelat, D.; Peterson, Bradley M.; Prabhu, T.P.; Roberts, G.; Sagar, R.; Salamanca, I.; Sekiguchi, Kazuhiro; Storchi-Bergmann, Thaisa; Subramaniam, A.; Villada, M.; Wagner, R.M.; Whitelock, P.A.; Winkler, Hartmut; Clavel, J.; Dietrich, Matthias; Kollatschny, W.; Perola, G.C.; Van Winckel, H.; Van Wyk, Francois; O'Brien, P.T.; Recondo-Gonzalez, M.C.; Rodriguez-Pascual, P.M.; Santos-Lleo, M. (1994) [Artigo de periódico]
      The Seyfert 1 galaxy NGC 3783 was intensely monitored in several bands between 1991 December and 1992 August. This paper presents the results from the ground-based observations in the optical and near-IR bands, which ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. X. Variability of Fairall 9 from optical data 

      Santos-Lleo, M.; Chatzichristou, E.; Oliveira, Claudia Lucia Mendes de; Winge, Claudia; Alloin, Danielle Marie; Peterson, Bradley M.; Rodriguez-Pascual, P.M.; Stirpe, Giovanna M.; Beers, T.C.; Bragaglia, Angela; Claeskens, J.-F.; Federspiel, M.; Giannuzzo, E.; Gregorio-Hetem, J.; Mathys, G.; Salamanca, I.; Stein, P.; Stenholm, B.; Wilhelm, Ronald; Zanin, C.; Albrecht, P.; Calderon, J.H.; Caretta, C.A.; Carranza, Gustavo Jose; Costa, Roberto Dell'Aglio Dias da; Díaz, Rubén Joaquín; Dietrich, Matthias; Dottori, Horacio Alberto; Elizalde, Flavio; Goldes, G.; Ghosh, K.K.; Maia, M.A.G.; Paolantonio, S.; Rodrigues, Irapuan; Rodrigues-Ardila, Alberto; Schmitt, Henrique Roberto; Soundararajaperumal, S.; Souza, R.E. de; Willmer, C.N.A.; Zheng, W. (1997) [Artigo de periódico]
      The results of an optical monitoring campaign on the active nucleus in the luminous Seyfert 1 galaxy Fairall 9 are presented. This campaign was undertaken in parallel with ultraviolet spectroscopic monitoring with the IUE ...

    • Study of McLeish's interacting object 

      Díaz, Rubén Joaquín; Rodrigues, Irapuan; Dottori, Horacio Alberto; Carranza, Gustavo Jose (2000) [Artigo de periódico]
      We discuss the morphology, kinematics, and physical conditions of the emitting gas of the interacting system IRAS 20048—6621. We present as well numerical simulations of this interacting system, discovered by David McLeish ...

    • Study of the interacting system NGC 6845 

      Rodrigues, Irapuan; Dottori, Horacio Alberto; Brinks, Elias; Mirabel, I. Felix (1999) [Artigo de periódico]
      We present optical spectroscopy, B, V , R, and I CCD photometry, and VLA neutral hydrogen observations of the interacting quartet NGC 6845, also know as Klemola 30. NGC 6845 A, the dominant component, sports a broad and ...

    • Study of the nuclei of NGC 3732 and IC 4662 

      Pastoriza, Miriani Griselda; Dottori, Horacio Alberto (1981) [Artigo de periódico]
      The nuclei of two galaxies which show intense [O III] emission lines, NGC 3732, an Sa, and IC 4662, an irregular with a very bright nucleus, are analyzed spectroscopically. The physical condition of the emitting gas and ...

    • Super metal-rich clusters g158 and g177 in m31 : clues on the inner bulge/disc transition 

      Bica, Eduardo Luiz Damiani; Jablonka, Pascale; Santos Junior, Joao Francisco Coelho dos; Alloin, Danielle Marie; Dottori, Horacio Alberto (1992) [Artigo de periódico]
      The star clusters G 158 and G 177, located at projected distances smaller than 1.5 kpc from the semi-stellar nucleus of M 31, show spectra extreme in absorption-line strengths, comparable to those from the nuclei of giant ...

    • Synthesis of the integrated spectrum of metal-rich globular clusters using the hr diagram and a stellar library 

      Santos Junior, Joao Francisco Coelho dos; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto; Ortolani, Sergio; Barbuy, Beatriz (1995) [Artigo de periódico]
      An average integrated spectrum of the nearlysolar metallicity globular clusters NGC 6528, NGC 6553 and NGC 6440 is synthesized in the range 3500 < λ < 9750Å with a library of stellar spectra and constraints provided by the ...

    • The missing goliath's slingshot : massive black hole recoil at M83 

      Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Albacete Colombo, Juan Facundo; Mast, Damián (2010) [Artigo de periódico]
      The Fanaroff–Riley II radio source J133658.3−295105, which is also an X-ray source, appears to be projected onto the disk of the barred-spiral galaxy M83 at about 60" from the galaxy’s optical nucleus. J133658.3−295105 and ...

    • The occurrence of Aflatoxin B¹ contamination in peanuts and peanut products marketed in southern Brazil 

      Hoeltz, Michele; Einloft, Tiago Centeno; Oldoni, Verônica Possebon; Dottori, Horacio Alberto; Noll, Isa Beatriz (2012) [Artigo de periódico]
      This study investigated the occurrence of aflatoxin B1 in peanuts and peanut products marketed in the State of Rio Grande do Sul, Brazil. One hundred one samples of peanuts and peanut products were collected and analyzed ...