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We used near-infrared 2MASS data to construct visual extinction maps of asample of Southern Bok globules utilizing the NICE method. We derived radialextinction profiles of dense cores identified in the globules and analyzedtheir stability against gravitational collapse with isothermal Bonnor-Ebertspheres. The frequency distribution of the stability parameter xi_max of thesecores shows that a large number of them are located in stable states, followedby an abrupt decrease of cores in unstable states. This decrease is steeper forglobules with associated IRAS point sources than for starless globules.Moreover, globules in stable states have a Bonnor-Ebert temperature of T = 15+- 6 K, while the group of critical plus unstable globules has a differenttemperature of T = 10 +- 3 K. Distances were estimated to all the globulesstudied in this work and the spectral class of the IRAS sources was calculated.No variations were found in the stability parameters of the cores and thespectral class of their associated IRAS sources. On the basis of 13CO J = 1-0molecular line observations, we identified and modeled a blue-assymetric lineprofile toward a globule of the sample, obtaining an upper limit infall speedof 0.25 km/s.

A 2MASS Analysis of the Stability of Southern Bok Globules