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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Determinac?o do per?odo orbital de sistemas bin?rios clipsantes / Determination of the orbital period of eclipsing binary bystems

Os?rio, Yeisson Fabian Martinez 27 August 2009 (has links)
Made available in DSpace on 2014-12-17T15:14:51Z (GMT). No. of bitstreams: 1 YeissonFM.pdf: 3340927 bytes, checksum: 98ed1e2a05c440dd174a83499e9a7f15 (MD5) Previous issue date: 2009-08-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work is presented a new method for the determination of the orbital period (Porb) of eclipsing binary systems based on the wavelet technique. This method is applied on 18 eclipsing binary systems detected by the CoRoT (Convection Rotation and planetary transits) satellite. The periods obtained by wavelet were compared with those obtained by the conventional methods: box Fitting (EEBLS) for detached and semi-detached eclipsing binaries; and polynomial methods (ANOVA) for contact binary systems. Comparing the phase diagrams obtained by the different techniques the wavelet method determine better Porb compared with EEBLS. In the case of contact binary systems the wavelet method shows most of the times better results than the ANOVA method but when the number of data per orbital cicle is small ANOVA gives more accurate results. Thus, the wavelet technique seems to be a great tool for the analysis of data with the quality and precision given by CoRoT and the incoming photometric missions. / Neste trabalho ?e apresentado um novo m?etodo para determina?c ao do per?ıodo orbital (Porb) dos sistemas bin?arios eclipsantes baseado na t?ecnica wavelet. O m?etodo ?e aplicado em 18 sistemas bin?arios eclipsantes detectados pelo sat?elite CoRoT (Covection, Rotation and planetary Transits). Os per?ıodos obtidos por este m?etodo s ao comparados com os m?etodos convencionais para a determina?c ao deste per?ıodo: m?etodos de ajuste de caixa (EEBLS) para sistemas bin?arios de n ao contato e de semi contato; e os m?etodos polinomiais (ANOVA) para sistemas bin?arios de contato. Comparando os diagramas de fase dos diferentes m?etodos ?e not?avel a superiodidade do m?etodo wavelet sobre o EEBLS na determina?c ao do Porb. No caso dos sistemas bin?arios de contato o m?etodo mostra resultados melhores na maioria dos casos mas quando o n?umero de dados por ciclo orbital ?e reduzido o m?etodo ANOVA determina melhor estes per?ıodos. Assim, a t?ecnica wavelet mostra-se como uma ?otima ferramenta para a an?alise de dados com a qualidade e precis ao fornecidos pelo CoRoT, desde pontos de vista diferentes dos convencionais m?etodos de Fourier

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