Abstract
Molecular outflows have been discovered in three bright-rimmed globules, Ori-I-2, L1206, and rim E in IC 1396, respectively. These outflows are associated with cold IRAS sources without optical counterparts. They are good candidates for recently formed stars. The IRAS sources are separated by only 0.1-0.2 pc from the bright rims. Shock waves preceding ionization fronts (bright rims) can propagate to the positions of the IRAS sources in times as short as several times 10,000 yr. This suggests that star formation was triggered by the ionization/shock fronts surrounding these globules. The data agree with the radiation-driven implosion model for star formation proposed in 1980 by Klein et al. The ratios of luminosity of the associated IRAS sources to globule mass, 3-13 L/M (solar units), are much higher than the values found for isolated dark globules, 0.03-0.3 L/M, indicating that the continuing radiation-driven implosion process may cause formation of more luminous and perhaps more massive stars than within isolated dark globules. 33 refs.
Published Version
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