Not Known Factual Statements About Tese de Doutorado

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Para a confecção deste modelo foi utilizado a última versão (1.nine.6) do pacote de courses \textit abnTeX2 que segue as normas da Associação Brasileira de Normas Técnicas. A elaboração de uma monografia, dissertação ou tese pode ser feita sobrescrevendo o conteúdo deste modelo. Modelo, Monografia de qualificação, Dissertação, Tese, Latex % resumo em INGLÊS

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Photometric variability is one of the key traits of youthful stellar objects and Discovering its particularities in various wavelengths may possibly provide insights on the continued physical procedures at function in these types of objects. The most typical source of photometric variability in youthful stars would be the brightness modulation caused by the rotation of the spotted stellar floor. This type of variability lets the measurement of rotational periods in youthful stars. In the last a long time, the early pre-primary sequence stellar rotational evolution photo continues to be constrained by scientific tests targeting unique young regions at several different ages. Observational scientific studies counsel a dependence of rotation with mass, and for a few mass ranges a relationship among rotation as well as presence of the circumstellar disc. Not nonetheless thoroughly explored, though, would be the role of environmental problems on the stellar rotational regulation. In this particular thesis, we explored the prevalence and principal characteristics of in close proximity to-infrared variability in young stars in The huge OB Affiliation Cygnus OB2, which can be one.4 kpc from the Solar. For objects with periodic variability that may be connected to stellar rotation, we investigated the rotational properties of Cygnus OB2 associates. With the sample of rotational periods evaluated, we resolved questions regarding the influence of atmosphere Homes over the pre-primary sequence rotational evolution. We investigated JHK-band variability of 5083 applicant users (24% of which can be disc-bearing stars), working with information observed Along with the wide-discipline digicam (WFCAM) of the UK Infrared Telescope (UKIRT) on Mauna Kea, Hawaii. A total of 112 evenings were observed, spanning 217 times. The sample examined is spread above a industry of 0.seventy eight squared levels. The selection of variable stars was completed applying Stetson variability index, and 60% of The celebs from the sample were being discovered to get variable In keeping with this criterion.

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We investigated the light-curve morphology, along with the variants in the colour-colour and colour-magnitude diagrams for JHK-bands, and once the variability was hugely correlated in several bands and colors, the slopes produced by the variations within these kinds of diagrams were being believed. These slopes were in comparison with the slopes predicted within the models describing Bodily mechanisms dependable because of the variability in youthful stars, and the triggers of variability have been investigated. Period of time look for was executed using Lomb-Scargle periodogram for periods in between 0.83-forty five times. Period of time detections were being confirmed by using False Alarme Probability amounts, the Saunders stats, string/rope duration process, and Visible verification of folded light-weight curves. We identified 1224 periodic variable stars. Monte Dissertação de Mestrado Carlo simulations were carried out as a way to Consider completeness and contamination of the periodic sample, out of which 894 measured periods had been considered as trustworthy. Our examine was regarded resonably comprehensive for intervals involving two and thirty times. The final state of affairs with the rotational evolution of youthful stars found in other locations is verified by Cygnus OB2 period distributions, with disc-bearing stars rotating on average slower than stars with out discs. A mass-rotation dependence was also verified, but as in NGC 6530, extremely reduced mass stars (M < 0.4 Msun) are rotating on typical slower than greater mass stars (0.4 Msun < M < 1.4 Msun). We observed an excess of slow rotators among the lower mass population. The disc and mass-rotation connection was also analysed by taking into account the incident UV radiation arising from O stars in the association. Results appropriate While using the disc-locking state of affairs were being confirmed for stars with small UV incidence, but no statistical sizeable relation concerning rotation and disc existence was confirmed for Tese de Doutorado stars with substantial UV incidence, suggesting that substantial stars may have a crucial part on regulating the rotation of nearby reduced mass stars.

% Tanto na capa quanto nas folhas de rosto apenas a primeira letra da primeira palavra (ou nomes próprios) devem estar em letra maiúscula, todas as demais devem ser em letra minúscula.

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\start off anexosenv \chapter Páginas interessantes na Net \label chapter:paginas-interessantes \input tex/annex/paginas-interessantes \close anexosenv

\textoresumo[brazil] Este trabalho é um breve modelo para a escrita de monografias de qualificação, dissertações e teses utilizando o ambiente \LaTeX, de acordo com as normas exigidas pelo Instituto de Ciências Matemáticas e de Computação (ICMC), da Universidade de São Paulo (USP).