author = "Vilas Boas, Jos{\'e} Williams dos Santos and Myers, PC and 
                         Fuller, GA",
                title = "Dense cores of dark clouds. XII. (CO)-C-13 and CO)-O-18 in Lupus, 
                         Corona Australis, Vela, and Scorpius",
              journal = "Astrophysical Journal",
                 year = "2000",
               volume = "532",
               number = "2 Part 1",
                pages = "1038--1050",
                month = "Apr.",
             keywords = "RADIASTRONOMIA, nuvens, mol{\'e}culas, forma{\c{c}}{\~a}o de 
                         estrelas, ondas submilim{\'e}tricas, n{\'u}cleos, clouds, 
                         molecules, satr formation, submillimeter waves, cores.",
             abstract = "More than 110 dense condensations of the dark clouds in Lupus, 
                         Corona Australis, Norma, Vela, and Scorpius were observed in the 
                         (CO)-C-13 and (CO)-O-18 (J = 1-0)transitions. The condensations of 
                         dark clouds with high star formation activity like the Ophiuchus, 
                         Taurus, and Cepheus have average (CO)-O-18 and H-2 column 
                         densities of 1.8 x 10(15)and 1.1 x 10(22)cm(-2). If We take the 
                         average size of the condensations to be 0.2 pc, a condensation 
                         must have average H-2 volumetric densities greater than or equal 
                         to 2 x 10(4)cm(-3)in order to ea good candidate to form stars. The 
                         four Lupus filaments have similar radial velocities and velocity 
                         dispersions, suggesting that they originated from the same 
                         parental cloud. Among these filaments, Lupus 1 is unique in having 
                         recent star formation activity, despite the high number of T Tauri 
                         stars observed toward the others. Lupus 1 also shows a complex 
                         velocity gradient along its main axis. The distribution of radial 
                         velocities of the condensations observed toward Scorpius are in 
                         good agreement with the hypothesis that they are in a region with 
                         expansion velocity smaller than or equal to 18 km s(-1). The 
                         Corona Australis cloud has velocity gradients ranging from -0.5 km 
                         s(-1)pc(-1)at one extreme to 0.1 km s(-1)pc(-1)at the other.",
                 issn = "0004-637X and 1538-4357",
                label = "9557",
           targetfile = "2000_vilasboas.pdf",
        urlaccessdate = "16 jan. 2021"