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Para a confecção deste modelo foi utilizado a última versão (one.9.six) do pacote de classes \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
termo midia da língua inglesa, é um silogismo importado daquela língua. Sua origem é a mesma da língua
Photometric variability is probably the main features of young stellar objects and Checking out its particularities in numerous wavelengths may perhaps give insights on the ongoing Bodily processes at get the job done in this kind of objects. The commonest source of photometric variability in youthful stars will be the brightness modulation because of the rotation of a noticed stellar surface area. Such a variability permits the measurement of rotational durations in younger stars. In the final decades, the early pre-most important sequence stellar rotational evolution image has long been constrained by scientific studies concentrating on distinct youthful areas at several different ages. Observational scientific studies counsel a dependence of rotation with mass, and for a few mass ranges a relationship in between rotation plus the presence of the circumstellar disc. Not still entirely explored, though, may be the job of environmental situations over the stellar rotational regulation. Within this thesis, we explored the incidence and primary attributes of near-infrared variability in younger stars in The large OB association Cygnus OB2, that’s one.4 kpc faraway from the Sun. For objects Dissertação de Mestrado with periodic variability that can be affiliated with stellar rotation, we investigated the rotational Qualities of Cygnus OB2 customers. For the sample of rotational intervals evaluated, we dealt with questions concerning the outcome of atmosphere Houses over the pre-principal sequence rotational evolution. We investigated JHK-band variability of 5083 prospect members (24% of which can be disc-bearing stars), working with information observed While using the broad-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 0.78 squared degrees. The choice of variable stars was finished utilizing Stetson variability index, and sixty% of The celebrities in the sample had been observed to generally be variable Based on this criterion.
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We investigated the light-curve morphology, and also the versions from the colour-colour and colour-magnitude diagrams for JHK-bands, and in the event the variability was extremely correlated in numerous bands and colors, the slopes made by the variants inside this sort of diagrams have been Monografias Prontas believed. These slopes were being in comparison to the slopes anticipated through the products explaining physical mechanisms accountable with the variability in youthful stars, as well as causes of variability had been investigated. Time period research was done applying Lomb-Scargle periodogram for durations between 0.83-45 days. Time period detections ended up confirmed by making use of Phony Alarme Probability ranges, the Saunders figures, string/rope size strategy, and Visible verification of folded light-weight curves. We discovered 1224 periodic variable stars. Monte Carlo simulations were being performed to be able to Consider completeness and contamination on the periodic sample, away from which 894 calculated durations ended up regarded as responsible. Our study was considered resonably total for intervals involving two and thirty times. The final state of affairs with the rotational evolution of youthful stars noticed in other areas is confirmed by Cygnus OB2 period of time distributions, with disc-bearing stars rotating on regular slower than stars devoid of discs. A mass-rotation dependence was also confirmed, but as in NGC 6530, incredibly very low mass stars (M < 0.four Msun) are rotating on normal slower than bigger mass stars (0.four Msun < M < one.four Msun). We noticed an excessive of slow rotators One of the decrease mass populace. The disc and mass-rotation link was also analysed by taking into consideration the incident UV radiation arising from O stars while in the Affiliation. Benefits suitable Together with the disc-locking circumstance have been confirmed for stars with small UV incidence, but no statistical sizeable relation concerning rotation and disc existence was confirmed for stars with significant UV incidence, suggesting that large stars may have a vital position on regulating the rotation of nearby minimal 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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% ——————————————————————— % Arquivo que contém as definições que vão aparecer no glossário
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\begin anexosenv \chapter Páginas interessantes na Internet \label chapter:paginas-interessantes \input tex/annex/paginas-interessantes \end anexosenv