Navegação Ciências Exatas e da Terra por Autor "Dottori, Horacio Alberto"
Resultados 21-40 de 63
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HST/WFPC2 and VLT/ISAAC observations of proplyds in the giant H II region NGC 3603
(2000) [Artigo de periódico]We report the discovery of three proplyd-like structures in the giant H II region NGC 3603. The emission nebulae are clearly resolved in narrowband and broadband HST/WFPC2 observations in the optical and broadband VLT/ISAAC ... -
Infrared mergers and infrared quasi-stellar objects with galactic winds - II. NGC 5514 : two extranuclear starbursts with LINER properties and a supergiant bubble in the rupture phase
(2004) [Artigo de periódico]A study of the morphology, kinematics and ionization structure of the infrared (IR) merger NGC5514 is presented. This study is based mainly on INTEGRAL two-dimensional (2D) spectroscopy (obtained at the 4.2-m William ... -
Integrated UBV photometry of 624 star clusters and associations in the Large Magellanic Cloud
(1996) [Artigo de periódico]We present a catalogof integrated UBV photometry of 504 star clusters and 120 stellar associations in the LMC, part ofthem still embedded in emitting gas. We study age groups in terms of equivalent SWB types derived from ... -
Is J 133658.3-295105 a radio source at z ≥= 1.0 or at the distance of M 83?
(2008) [Artigo de periódico]We present Gemini optical imaging and spectroscopy of the radio source J 133658.3–295105. This source has been suggested to be the core of an FR II radio source with two detected lobes. J 133658.3–295105 and its lobes are ... -
Kinematics and modeling of the inner region of M 83?
(2009) [Artigo de periódico]Two-dimensional kinematics of the central region of M 83 (NGC 5236) were obtained through three-dimensional NIR spectroscopy with the Gemini South telescope. The spatial region covered by the integral field unit (∼ 5 ×13 ... -
Kinematics of the central regions of NGC 1672
(1999) [Artigo de periódico]We present the detailed velocity field of the central 2 kpc of the LINER galaxy NGC 1672. The iso- velocity map shows a rotational pattern with a velocity gradient of 50 km s-ˡ arcsec-ˡ in the inner 6" (1"≈ 70 pc), indicating ... -
Luminous infrared galaxies. III. Multiple merger, extended massive star formation, galactic wind, and nuclear inflow in NGC 3256
(2000) [Artigo de periódico]We report detailed evidence for multiple merger, extended massive star formation, galactic wind, and circular/noncircular motions in the luminous infrared galaxy NGC 3256, based on observations of highresolution imaging ... -
Measurements of the equivalent width of the h/sub beta/ emission line and age determination of hii regions of the lmc and smc
(1981) [Artigo de periódico]The equivalent width of the emission line Hβ was measured photoelectrically in 29 H II regions of the LMC and 2 of the SMC respectively. The age of these regions was obtained through a calibration of Wʜβ. A relation was ... -
A morphological method to determine corotation radII in spiral galaxies
(1997) [Artigo de periódico]Shock-induced star formation in a stellar density wave scenario produces an azimuthal gradient of ages across the spiral arms that has opposite signs on either side of the corotation resonance (CR). We present a method ... -
Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies
(2013) [Artigo de periódico]Context. It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and ... -
A new giant branch clump structure in the Large Magellanic Cloud
(1999) [Artigo de periódico]We present Washington C and T1 CCD photometry of 21 Ðelds located in the northern part of the Large Magellanic Cloud (LMC), and spread over a region of more than 2.5 deg² approximately 6° from the bar. The surveyed areas ... -
NGC 1912 and NGC 1907 : a close encounter between open clusters?
(2002) [Artigo de periódico]The possible physical relation between the closely projected open clusters NGC 1912 (M 38) and NGC 1907 is investigated. Previous studies suggested a physical pair based on similar distances, and the present study explores ... -
Ocorrência, aspectos toxicológicos, métodos analíticos e controle da patulina em alimentos
(2009) [Artigo de periódico]A patulina é uma micotoxina produzida por várias espécies de Penicillium, Aspergillus e Byssochlamys. Em experimentos com animais, ela demonstrou ter atividade mutagênica, carcinogênica e teratogênica. Tem sido freqüentemente ... -
Ocratoxina A : análise da qualidade de vinhos brasileiros e importados
(2012) [Artigo de periódico]Estudos em diferentes partes do mundo mostraram que o vinho pode conter Ocratoxina A, uma micotoxina com propriedades nefrotóxicas e carcinogênicas. O objetivo deste trabalho foi avaliar a presença de Ocratoxina A em vinhos ... -
On the meaning of a minimization procedure applied to a degenerate astrophysical problem
(1989) [Artigo de periódico]We apply the MINOS optimization system to the population synthesis of galaxy nuclei using as basis a grid of star cluster spectral features as a function of age and metallicity. In inverse numerical problems, a minimization ... -
On warmers as the ionizing source in active galactic nuclei
(1992) [Artigo de periódico]The aim of this paper is to study in detail the Terlevich & Melnick starburst-warmers scenario for type 2 Seyferts and LINERs, which postulates a young cluster containing stars with temperatures about 150 000 K as the ... -
Open clusters or their remnants : B and V photometry of NGC 1901 and NGC 1252
(2001) [Artigo de periódico]Photometry in the B and V bands is presented for the southern stellar groups NGC1901 and NGC1252. NGC1901 is often described as an open cluster while NGC 1252 consists of a concentration of about 20 stars centered ≈ 20' ... -
Optical and near-ir spectrophotometry of the galaxy ngc 3310
(1993) [Artigo de periódico]We present spectrophotometric observations in the optical and near-infrared of the nucleus and six H11 regions in the spiral galaxy NGC 3310. Four of the regions are circumnuclear at less than 400 pc from the nucleus, and ... -
Pattern speed of main spiral arms in NGC 2997
(2009) [Artigo de periódico]Context. Bright knots along arms are observed in K-band images of many grand-design spiral galaxies. They are identified as young starforming complexes using K-band spectra which show strong Brγ emission. Their alignment ... -
Patulin accumulation in apples during storage by Penicillium expansum and Penicillium griseofulvum strains
(2011) [Artigo de periódico]A part of apples destined to juice production is generally of poor quality. Apples from cold storage or recently harvest (ground harvested or low quality apples) are stored under ambient conditions until they are processed. ...
