@PhDThesis{Hickel:2002:PrFíGl,
               author = "Hickel, Gabriel Rodrigues",
                title = "Propriedades f{\'{\i}}sicas de gl{\'o}bulos comet{\'a}rios",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2002",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2002-04-12",
             keywords = "gl{\'o}bulos coment{\'a}rios, forma{\c{c}}{\~a}o estelar, 
                         linhas moleculares: CO, 13CO, C18O, HCN, HC+, 
                         polariza{\c{c}}{\~a}o linear, infravermelho: fotometria, 
                         cometary globules, star formation, molecular lines: CO, 13CO3 
                         C180, , HCN and HCO+, linear polarization, infrared: photometry.",
             abstract = "O objetivo deste trabalho {\'e} analisar gl{\'o}bulos 
                         comet{\'a}rios (GCs) e condensa{\c{c}}{\~o}es localizadas na 
                         regi{\~a}o da Vela conhecida como IRAS Vela Shell, para 
                         determinar suas propriedades f{\'{\i}}sicas (temperatura, 
                         densidade, massa, abund{\^a}ncias moleculares, campo 
                         magn{\'e}tico, e outras mais) e explorar a rela{\c{c}}{\~a}o 
                         entre essas propriedades e as condi{\c{c}}{\~o}es iniciais para 
                         a forma{\c{c}}{\~a}o de estrelas de pequena massa. Propriedades 
                         visuais, polariza{\c{c}}{\~a}o linear {\'o}ptica, an{\'a}lise 
                         da emiss{\~a}o estendida no infravermelho distante e 
                         observa{\c{c}}{\~o}es de transi{\c{c}}{\~o}es moleculares do 
                         CO, 13CO3 C180, HCN e HCO+ ser{\~a}o utilizadas nesta 
                         an{\'a}lise. As propriedades visuais dos GCs nos permitem 
                         classificar, agrupar e estimar suas dimens{\~o}es e 
                         orienta{\c{c}}{\~o}es. A polariza{\c{c}}{\~a}o linear 
                         {\'o}ptica fornece informa{\c{c}}{\~o}es sobre o grau de 
                         polariza{\c{c}}{\~a}o e a dire{\c{c}}{\~a}o do campo 
                         magn{\'e}tico local projetado no plano do c{\'e}u. A 
                         an{\'a}lise da emiss{\~a}o estendida no infravermelho distante 
                         utilizar{\'a} imagens do IRAS (Sky Survey Atlas: ISSA) em 60 e 
                         100 pm para estimar v{\'a}rias propriedades f{\'{\i}}sicas dos 
                         GCs a partir da emiss{\~a}o da poeira associada ao g{\'a}s. As 
                         transi{\c{c}}{\~o}es moleculares ser{\~a}o utilizadas para 
                         determinar v{\'a}rios par{\^a}metros f{\'{\i}}sicos do 
                         g{\'a}s, tais como temperatura, densidade, massa e dispers{\~a}o 
                         de velocidades. ABSTRACT: The goal of this work is determine the 
                         physical properties (temperature, density, mass, chemical 
                         abundances, magnetic field) of cometary globules (CGs) and small 
                         dark clouds located in the known IRAS Vela Shell. We analised how 
                         these physical properties are related to initial conditions for 
                         low-mass star formation. The physical properties were derivate of 
                         a multi-technical, multi-wavelength approuch using visual 
                         properties, linear polarization, thermal dust emission at 
                         far-infrared (IRAS), and observations of CO, 13CO, C18O, HCN and 
                         HCO+ molecular transitions. Visual properties were estimate from 
                         optical images and helped us to identify some typical 
                         characteristics as bright rims, dimensions and tail directions. 
                         Linear polarization was a important tool to proved the grain 
                         alignment and magnetic field structure in the neighbourhood of 
                         CGs. We observed three pattems of linear polarization: randomic; 
                         two directions and uniform alignment with very low dispersion. The 
                         far-infrared emission at 60 and 100 1.1m (IRAS - Sky Survey Atlas: 
                         ISSA) was analysed to temperature and opacity of dust in the 
                         direction of CGs. Finally, the molecular transitions provided us 
                         some physical conditions of gas, as excitation temperature, 
                         density and velocity dispersion. The contour maps of gas emission 
                         showed a step profile that had good match with visual 
                         boundaries.",
            committee = "Jablonski, Francisco Jos{\'e} (presidente) and Vilas Boas, 
                         Jos{\'e} Williams dos Santos (orientador) and Rodrigues, 
                         Cl{\'a}udia Vilega and Scalise J{\'u}nior, Eugenio and Abraham, 
                         Zulema and Lepine, Jacques R.",
           copyholder = "SID/SCD",
         englishtitle = "x",
                label = "9950",
             language = "pt",
                pages = "298",
                  ibi = "6qtX3pFwXQZ3r59YCT/H3CUs",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZ3r59YCT/H3CUs",
           targetfile = "publicacao.pdf",
        urlaccessdate = "03 maio 2024"
}