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In this article will be noticed the objective to trace the ironic style of the chronicler Rubem Braga. The punctuations of the highlighted author"™s style were seen given the social and historical context of the time in which his artistic works were made, throughout the 20th century. There are genuine reasons for the elaboration of this paper, considering that Rubem Braga through his chronicles still is basis for various research whether in the unified school districts or in the Academia due to the themes approached in his chronicles that although discussed in a twentieth century context, are still prevailing themes because it deals with timeless problems regarding the day-to-day of society. The theoreticians who will contribute to the research will be Sousa (2012), Drummond (2012), Costa (2011), Candido (1992), Santana (2006), Ribeiro (2009), Brandão. This context relation – ironic style in the chronicles of Rubem Braga will be analyzed based on the chronicle "Aconteceu com Orestes" by the aforementioned chronicler, detecting his irony being discharged against the astrological predictions of a character named Mirakoff. Neste artigo, será perceptí­vel o objetivo de tracejar o estilo irônico do cronista Rubem Braga. As pontuações do estilo do autor em destaque foram vistas dado o contexto social e histórico da época em que este realizou suas produções artí­sticas, ao longo do século XX. Há motivos válidos para a produção do presente artigo, haja vista Rubem Braga, através de suas crônicas, ainda ser centro de várias pesquisas, quer na rede regular de ensino (fundamental e médio), quer na Academia. Os temas abrangidos nas crônicas de Braga, embora discutidos em um contexto do século XX, ainda são temas atuais por tratarem de problemas atemporais no tocante ao cotidiano da sociedade. Os teóricos que contribuirão à pesquisa feita serão: Sousa (2012), Drummond (2012), Costa (2011), Candido (1992), Santana (2006), Ribeiro (2009), Brandão (1983), Muecke (1995). Essa relação contexto - estilo irônico nas crônicas de Rubem Braga será analisada com base na produção artí­stica "Aconteceu com Orestes", do referido cronista, detectando-se a ironia dele sendo disparada contra as previsões astrológicas de um personagem chamado Mirakoff.

Continuing our series of papers on the three-dimensional (3-D) structures of and accurate distances to Planetary Nebulae (PNe), we present our study of the planetary nebula NGC6781. For this object we construct a 3-D photoionization model and, using the constraints provided by observational data from the literature we determine the detailed 3-D structure of the nebula, the physical parameters of the ionizing source and the first precise distance. The procedure consists in simultaneously fitting all the observed emission line morphologies, integrated intensities and the 2-D density map from the [SII] line ratios to the parameters generated by the model, and in an iterative way obtain the best fit for the central star parameters and the distance to NGC6781, obtaining values of 950+-143pc and 385 Lsun for the distance and luminosity of the central star respectively. Using theoretical evolutionary tracks of intermediate and low mass stars, we derive the mass of the central star of NGC6781 and its progenitor to be 0.60+-0.03 Msun and 1.5+-0.5 Msun respectively., Comment: 16 pp, 6 figues, 2 tables, submitted to the ApJ

Esta nota tem por objetivo tratar da determinação da taxa de rotação do Sol e outras estrelas. Após uma breve introdução histórica, é descrito o método da transformada de Fourier (TF) aplicada ao estudos dos perfis espectroscópicos, e discutidos os efeitos da rotação estelar sobre a forma dos perfis de linhas espectrais. This note paper deals with the determination of the Sun's rotation rate as well as for other stars. After a short historical introduction, it is described the Fourier Transform method applied to spectroscopic profiles, and also a discussion on the effects of the stellar rotation in the shape of spectral line profiles is presented.